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납
납 구조식 이미지
카스 번호:
7439-92-1
한글명:
동의어(한글):
납;납원소;납플레이크;C.I.염료금속4;납S2;납입자상;납분;납및그화합물;납, 원소
상품명:
Lead
동의어(영문):
SO;Pb;Blei;KS-4;Olow;LEAD;SSO 1;Omaha;plomb;Glover
CBNumber:
CB9854174
분자식:
Pb
포뮬러 무게:
207.2
MOL 파일:
7439-92-1.mol

납 속성

녹는점
327.4 °C (lit.)
끓는 점
1740 °C (lit.)
밀도
1.00 g/mL at 20 °C
굴절률
2.881 (632.8 nm)
저장 조건
Store at +5°C to +30°C.
저장 조건
no restrictions.
용해도
H2O: soluble
물리적 상태
wire
색상
Olive-green or red to brown
Specific Gravity
11.288
냄새
Odorless gas
비저항
20.65 μΩ-cm
수용성
reacts with hot conc HNO3, boiling conc HCl, H2SO4 [MER06]
Merck
13,5414
노출 한도
TLV-TWA 0.15 mg/m3 as Pb (ACGIH and MSHA), 0.05 mg (Pb)/m3 (OSHA); 10-h TWA 0.1 mg(inorganic lead)/m3 (NIOSH).
안정성
Stable. Incompatible with strong oxidizing agents, potassium, sodium.
CAS 데이터베이스
7439-92-1(CAS DataBase Reference)
IARC
2B (Vol. 23, Sup 7) 1987
EPA
Lead (7439-92-1)
안전
  • 위험 및 안전 성명
  • 위험 및 사전주의 사항 (GHS)
위험품 표기 T,Xi,Xn,N
위험 카페고리 넘버 61-33-40-48/20-62-36/38-20/22-51/53-50/53-48/20/22-52/53-34-23/24/25
안전지침서 53-45-61-36/37-36-26-60-36/37/39
유엔번호(UN No.) UN 3082 9/PG 3
WGK 독일 3
RTECS 번호 OF7525000
TSCA Yes
위험 등급 8
포장분류 III
HS 번호 78011000
유해 물질 데이터 7439-92-1(Hazardous Substances Data)
독성 LDLO oral (pigeon)
160 mg/kg
PEL (OSHA)
0.05 mg/m3
PEL (action level)
0.03 mg/m3
TLV-TWA (ACGIH)
0.05 mg/m3
(PEL and TLV apply to lead and inorganic lead compounds)
기존화학 물질 KE-21887
유해화학물질 필터링 06-5-8
함량 및 규제정보 물질구분: 제한물질; 혼합물(제품)함량정보: 납 및 이를 0.06% 이상 함유한 혼합물
그림문자(GHS):
신호 어: Danger
유해·위험 문구:
암호 유해·위험 문구 위험 등급 범주 신호 어 그림 문자 P- 코드
H301 삼키면 유독함 급성 독성 물질 - 경구 구분 3 위험 P264, P270, P301+P310, P321, P330,P405, P501
H302 삼키면 유해함 급성 독성 물질 - 경구 구분 4 경고 P264, P270, P301+P312, P330, P501
H311 피부와 접촉하면 유독함 급성 독성 물질 - 경피 구분 3 위험 P280, P302+P352, P312, P322, P361,P363, P405, P501
H332 흡입하면 유해함 급성 독성 물질 흡입 구분 4 경고 P261, P271, P304+P340, P312
H350 암을 일으킬 수 있음 (노출되어도 암을 일으키지 않는다는 결정적인 증거가 있는 노출경로가 있다면 노출경로 기재) 발암성 물질 구분 1A, 1B 위험
H351 암을 일으킬 것으로 의심됨 (노출되어도 암을 일으키지 않는다는 결정적인 증거가 있는 노출경로가 있다면 노출경로 기재) 발암성 물질 구분 2 경고 P201, P202, P281, P308+P313, P405,P501
H360 태아 또는 생식능력에 손상을 일으킬 수 있음 생식독성 물질 구분 1A, 1B 위험
H373 장기간 또는 반복 노출되면 장기(또는, 영향을 받은 알려진 모든 장기를 명시)에 손상을 일으킬 수 있음 특정 표적장기 독성 - 반복 노출 구분 2 경고 P260, P314, P501
H400 수생생물에 매우 유독함 수생 환경유해성 물질 - 급성 구분 1 경고 P273, P391, P501
H410 장기적 영향에 의해 수생생물에 매우 유독함 수생 환경유해성 물질 - 만성 구분 1 경고 P273, P391, P501
예방조치문구:
P201 사용 전 취급 설명서를 확보하시오.
P260 분진·흄·가스·미스트·증기·...·스프레이를 흡입하지 마시오.
P261 분진·흄·가스·미스트·증기·...·스프레이의 흡입을 피하시오.
P273 환경으로 배출하지 마시오.
P280 보호장갑/보호의/보안경/안면보호구를 착용하시오.
P322 특정 조치(라벨의 … 참조)
P391 누출물을 모으시오.
P302+P352 피부에 묻으면 다량의 물로 씻으시오.
P304+P340 흡입하면 신선한 공기가 있는 곳으로 옮기고 호흡하기 쉬운 자세로 안정을 취하시오.
P308+P313 노출 또는 접촉이 우려되면 의학적인 조치· 조언를 구하시오.
P405 밀봉하여 저장하시오.
NFPA 704
0
2 0

납 C화학적 특성, 용도, 생산

개요

Lead was one of the earliest metals used by humans, with possible use extending as far back as the seventh millennium BC, and reaching its preindustrial peak usage during the reign of the Roman Empire, around the beginning of the Common Era.

화학적 성질

Lead is a lustrous silvery metal that tarnishes in the presence of air and becomes a dull bluish gray. The chemical symbol, Pb, is derived from plumbum, the Latin word for waterworks, because of lead’s extensive use in ancient water pipes. Lead has four electrons in its valence shell, but only two ionize readily. The usual oxidation state of lead in inorganic compounds is therefore +2 rather than +4. Lead generally forms stable compounds; the most important ones are lead oxide (PbO) and lead carbonate (PbCO3)2. Four stable lead isotopes exist in nature (208Pb , 206Pb , 207Pb, and 204Pb , in order of abundance). Lead mined from deposits of different geologic eras has entered the environment, so that today there are wide variations and extensive mixture of isotopic ratios of lead in commerce and in the environment. These differences in isotopic ratios may sometimes be used as nonradioactive tracers in environmental and metabolism studies.

화학적 성질

grey metal granules, shot, foil, sheet or powder

물리적 성질

Lead is a bluish-white, heavy metallic element with properties that are more metal-like thanthe properties of metalloids or nonmetals. Lead can be found in its native state, meaning thatelemental metallic lead can be found in deposits in the Earth’s crust. However, most lead isfirst mined as galena ore (lead sulfide, PbS). The galena is mixed with lead sulfate, lead sulfide,and lead oxide and is then roasted at a high temperature. The air supply is reduced, followedby an increase in heat and the vaporization of the sulfates and oxides of lead, which are drawnoff as gases. The molten lead is then recovered.
Lead is only slightly soluble in water. However, it is also toxic. This is the reason lead isno longer used to pipe fresh water into homes. It does not react well with acids, with theexception of nitric acid. Lead’s melting point is 327.46°C, its boiling point is 1,740°C, andits density is 11.342 g/cm3.

Isotopes

There are 47 isotopes of lead, four of which are stable. One of these four is Pb-204, which makes up 1.4% of the natural abundance of lead found on Earth. In reality thisisotope is not stable but has a half-life that is so long (1.4×10+17 years), with some of theancient deposits still existing, that it is considered stable. The other three stable isotopes oflead and their proportion to the total natural abundance are as follows: Pb-206 = 24.1%,Pb-207 = 22.1%, and Pb-208 = 52.4%. All the other isotopes are radioactive.

Origin of Name

From the Latin word alumen, or aluminis, meaning “alum,” which is a bitter tasting form of aluminum sulfate or aluminum potassium sulfate.

출처

Lead is the 35th most abundant element on Earth. Although it has been found in its freeelemental metal state, it is usually obtained from a combination of the following ores: galena(PbS), anglesite (PbSO4), cerussite (PbCO3), and minum (Pb3O4). Lead ores are locatedin Europe (Germany, Rumania, and France), Africa, Australia, Mexico, Peru, Bolivia, andCanada. The largest deposits of lead in the United States are in the states of Missouri, Kansas,Oklahoma, Colorado, and Montana.
One of the most famous mining towns is the high-altitude western city of Leadville,Colorado. The boom started with the gold rush of the 1860s, followed by silver mining in the1870s and 1880s. Today, this city is the site of mining operations not only for lead, but alsofor zinc and molybdenum. At the height of its fame, Leadville had a population of almost50,000 people. Today the population is about 2,500.
Lead is commonly obtained by roasting galena (PbS) with carbon in an oxygen-rich environmentto convert sulfide ores to oxides and by then reducing the oxide to metallic lead.Sulfur dioxide gas is produced as a waste product. Large amounts of lead are also recoveredby recycling lead products, such as automobile lead-acid electric storage batteries. About onethirdof all lead used in the United States has been recycled.

Characteristics

Although lead can be found as a metal in the Earth’s crust, it is usually mined and refinedfrom minerals and ores. Lead is one of the most common and familiar metallic elementsknown. Although it is somewhat scarce, found at proportions of 13 ppm, it is still more prevalentthan many other metals. Lead is noncombustible. and it resists corrosion.
When lead, which is very soft, is freshly cut, it has shiny blue-white sheen, which soonoxidizes into its familiar gray color. Lead is extremely malleable and ductile and can be workedinto a variety of shapes. It can be formed into sheets, pipes, buckshot, wires, and powder.Although lead is a poor conductor of electricity, its high density makes it an excellent shieldfor protection from radiation, including X-rays and gamma rays.

역사

Lead is obtained chiefly from galena (PbS) by a roasting process. Anglesite (PbSO4), cerussite (PbCO3), and minim (Pb3O4) are other common lead minerals. Lead is a bluish-white metal of bright luster, is very soft, highly malleable, ductile, and a poor conductor of electricity. It is very resistant to corrosion; lead pipes bearing the insignia of Roman emperors, used as drains from the baths, are still in service. Lead is used in containers for corrosive liquids (such as sulfuric acid) and may be toughened by the addition of a small percentage of antimony or other metals. Natural lead is a mixture of four stable isotopes: 204Pb (1.4%), 206Pb (24.1%), 207Pb (22.1%), and 208Pb (52.4%). Lead isotopes are the end products of each of the three series of naturally occurring radioactive elements: 206Pb for the uranium series, 207Pb for the actinium series, and 208Pb for the thorium series. Forty-three other isotopes of lead, all of which are radioactive, are recognized. Its alloys include solder, type metal, and various antifriction metals. Great quantities of lead, both as the metal and as the dioxide, are used in storage batteries. Lead is also used for cable covering, plumbing, and ammunition. The metal is very effective as a sound absorber, is used as a radiation shield around X-ray equipment and nuclear reactors, and is used to absorb vibration. Lead, alloyed with tin, is used in making organ pipes. White lead, the basic carbonate, sublimed white lead (PbSO4), chrome yellow (PbCrO4), red lead (Pb3O4), and other lead compounds are used extensively in paints, although in recent years the use of lead in paints has been drastically curtailed to eliminate or reduce health hazards. Lead oxide is used in producing fine “crystal glass” and “flint glass” of a high index of refraction for achromatic lenses. The nitrate and the acetate are soluble salts. Lead salts such as lead arsenate have been used as insecticides, but their use in recent years has been practically eliminated in favor of less harmful organic compounds. Care must be used in handling lead as it is a cumulative poison. Environmental concern with lead poisoning led to elimination of lead tetraethyl in gasoline. The U.S. Occupational Safety and Health Administration (OSHA) has recommended that industries limit airborne lead to 50 μg/cu. meter. Lead is priced at about 90¢/kg (99.9%).

용도

Lead has been known to humankind sinceancient times. It is a major component ofmany alloys, such as bronze and solder. Itis used for tank linings, piping, and buildingconstruction; in the manufacture of pigmentsfor paints, tetraethyllead, and many organicand inorganic compounds; in storage batteries;and in ceramics. Lead levels in manysoils have been range from 5 to 25 mg/kgand in groundwaters from 1 to 50 μg/L.These concentrations may vary significantly.

용도

Construction material for tank linings, piping, and other equipment handling corrosive gases and liqs used in the manufacture of sulfuric acid, petroleum refining, halogenation, sulfonation, extraction, condensation; for x-ray and atomic radiation protection; manufacture of tetraethyllead, pigments for paints, and other organic and inorganic lead Compounds; bearing metal and alloys; storage batteries; in ceramics, plastics, and electronic devices; in building construction; in solder and other lead alloys; in the metallurgy of steel and other metals.

용도

Lead has many uses and is an important commercial commodity. One of the most commonuses is in the acid-lead electrical storage batteries used in automobiles. Much of the leadin these devices can be recycled and used again.
In the past, tetraethyl lead was added to gasoline to slow its burning rate in order to preventengine “knock” and increase performance. This caused serious and harmful pollution, and leadhas since been eliminated as a gasoline additive in most countries. Most exterior (and someinterior) house paints once contained high levels of lead as well. Today, the amount of lead inpaint is controlled, with not more than 0.05% allowed in the paint material.
Lead is used to make a number of important alloys. One is solder, an alloy of 1/2 lead and1/2 tin. Solder is a soft, low-melting metal that, when melted, is used to join two or moreother metals-particularly electrical components and pipes.
Babbitt metal is another alloy of lead that is used in the manufacture of wheel bearingsthat reduces friction. Lead is an ingredient in several types of glass, such as lead crystal andflint glass.
TV screens are coated with lead to absorb any radiation projected by the mechanism, andover 500,000 tons of lead is used in consumer electronics (computers, phones, games, and soon). Much of it ends up in solid waste dumps.
Many lead compounds are poisonous; thus, their uses in insecticides and house paints havebeen limited as other less toxic substances have been substituted. For example, lead arsenate[Pb3(AsO4], which is very poisonous, has been replaced in insecticides by less harmful substances.

용도

In worldwide metal use, lead ranks behind only iron, copper, aluminum, and zinc (Howe 1981). Its largest use is in lead-acid storage batteries for motor vehicles and general industry. Lead metal also is commonly used for ammunition, cable covering, piping, brass and bronze, bearing metals for machinery, and sheet lead (ATSDR 1999).
All of the major soluble lead compounds have industrial uses. Lead acetate is used as a water repellent, for mildew protection, and as a mordant for cotton dyes. Lead acetate trihydrate is used in varnishes, chrome pigments, and as an analytical reagent, and lead chloride is used in asbestos clutch or brake linings, as a catalyst, and as a flame retardant. Lead nitrate is used in the manufacture of matches and explosives, as a heat stabilizer in nylon, and as a coating on paper for photothermography. Lead subacetate is used in sugar analysis and for clarifying solutions of organic substances (HSDB 2009).
The insoluble lead compounds also have a variety of uses. Lead azide and lead styphnate both are used in munitions manufacture. Lead carbonate, lead fluoride, lead fluoborate, and lead naphthenate are used as catalysts, with additional uses in the electronic and optical industries (lead fluoride), in coatings for thermographic copying (lead carbonate), as a curing agent for epoxy resins (lead fluoborate), and as a varnish drier (lead naphthenate). Lead phosphate and lead stearate both are used as stabilizers in the plastics industry. Lead iodide and lead sulfate are used in photography; lead iodide is also used in thermoelectric materials, and lead sulfate with zinc in galvanic batteries. Lead oxide and lead sulfide are used in ceramics; lead oxide is also used as a vulcanizing agent in rubber and plastics, and lead sulfide as a humidity sensor in rockets. Lead chromate is used as a pigment in paints, rubber, and plastics; lead tetraoxide is used in plasters, ointments, glazes, and varnishes; and lead thiocyanate is used in the manufacture of safety matches and cartridges. Lead arsenate formerly was used as an insecticide and herbicide, but no current uses were found.
Organic lead (including tetraethyl lead and tetramethyl lead) was widely used in the United States as an anti-knock additive in motorvehicle fuels until the U.S. Environmental Protection Agency initiated a phase-out of leaded gasoline in the early 1970s. By 1988, the total lead used in gasoline had been reduced to 1% of the 1970 level; in 1996, the use of lead in fuel for on-road motor vehicles was totally banned. Despite the legislated end to use of lead as a gasoline additive and reductions in some other uses of lead, overall U.S. lead consumption continued to grow until 1999, mainly because of increased production of lead-acid batteries (ATSDR 1999), but has since been on a general decline (USGS 2009, 2010, Guberman 2010).

생산 방법

The geometric mean soil lead level is 38 mg/kg. Lead rarely occurs in the elemental state, but exists widely throughout the world in a number of ores, the most common of which is the sulfide, galena. The other minerals of commercial importance are the oxides, carbonate (cerussite), and the sulfate (anglesite), which are much less common.
Lead also occurs in various uranium and thorium minerals, arising directly from radioactive decay. Because certain isotopes are concentrated in lead derivatives from such sources, both the atomic weight and the density of the samples vary significantly from normal lead. Lead ores generally occur in nature in association with silver and zinc. Other metals commonly occurring with lead ores are copper, arsenic, antimony, and bismuth. Most of the world production of arsenic, antimony, and bismuth is a result of their separation from lead ores. Commercial lead ores may contain as little as 3% lead, but a lead content of 10% is most common. The ores are concentrated to ≥ 40% lead content before smelting. A variety of mechanical separation processes may be employed for the concentration of lead ores, but the sulfide ores are generally concentrated by flotation processes.

정의

lead: Symbol Pb. A heavy dull greysoft ductile metallic element belongingto group 14 (formerly IVB) ofthe periodic table; a.n. 82; r.a.m.207.19; r.d. 11.35; m.p. 327.5°C; b.p.1740°C. The main ore is the sulphidegalena (PbS); other minor sources includeanglesite (PbSO4), cerussite (PbCO3), and litharge (PbO). Themetal is extracted by roasting the oreto give the oxide, followed by reductionwith carbon. Silver is also recoveredfrom the ores. Lead has a varietyof uses including building construction,lead-plate accumulators, bullets,and shot, and is a constituent of suchalloys as solder, pewter, bearing metals,type metals, and fusible alloys.Chemically, it forms compoundswith the +2 and +4 oxidation states,the lead(II) state being the more stable.

일반 설명

Soft silver-bluish white to gray metal.

공기와 물의 반응

Insoluble in water.

반응 프로필

In the presence of carbon, the combination of chlorine trifluoride with aluminum, copper, Lead, magnesium, silver, tin, or zinc results in a violent reaction [Mellor 2, Supp. 1: 1956]. A solution of sodium azide in copper pipe with Lead joints formed copper and Lead azide, both are detonating compounds [Klotz 1973]. Sodium acetylide becomes pyrophoric when mixed with metals like Lead. Mixtures of trioxane with 60% hydrogen peroxide in contact with metallic Lead when heated detonated. Lead containing rubber ignited in a nitric acid atmosphere. Lead is incompatible with strong oxidants such as: ammonium nitrate, chlorine trifluoride, hydrogen peroxide, etc.

위험도

Lead is probably one of the most widely distributed poisons in the world. Not only is themetal poisonous, but most lead compounds are also extremely toxic when inhaled or ingested.A few, such as lead alkalis, are toxic when absorbed through skin contact.
Workers in industries using lead are subject to testing of their blood and urine to determinethe levels of lead in their bodies’ organs. Great effort is made to keep the workers safe.
Unfortunately, many older homes (built prior to 1950) have several coats of lead-basedpaints that flake off, which then may be ingested by children, causing various degrees of leadpoisoning, including mental retardation or even death.
Young children are more susceptible to an accumulation of lead in their systems than areadults because of their smaller body size and more rapidly growing organs, such as the kidneys,nervous system, and blood-forming organs. Symptoms may include headaches, dizziness,insomnia, and stupor, leading to coma and eventually death.
Lead poisoning can also occur from drinking tap water contained in pipes that have beensoldered with lead-alloy solder. This risk can be reduced by running the tap water until it iscold, which assures a fresher supply of water.
Another hazardous source of lead is pottery that is coated with a lead glaze that is notstabilized. Acidic and hot liquids (citrus fruits, tea, and coffee) react with the lead, and eachuse adds a small amount of ingested lead that can be accumulative. Lead air pollution is stilla problem, but not as great as before, given that tetraethyl lead is no longer used in gasoline.However, lead air pollution remains a problem for those living near lead smelting operationsor in countries where leaded gasoline is still permitted.
Even though lead and many of its compounds are toxic and carcinogenic, our lives wouldbe much less satisfying without its use in our civilization.

건강위험

The acute toxicity of lead and inorganic lead compounds is moderate to low. Symptoms of exposure include decreased appetite, insomnia, headache, muscle and joint pain, colic, and constipation. Inorganic lead compounds are not significantly absorbed through the skin.
Chronic exposure to inorganic lead via inhalation or ingestion can result in damage to the peripheral and central nervous system, anemia, and chronic kidney disease. Lead can accumulate in the soft tissues and bones, with the highest accumulation in the liver and kidneys, and elimination is slow. Lead has shown developmental and reproductive toxicity in both male and female animals and humans. Lead is listed by IARC in Group 2B ("possible human carcinogen") and by NTP as "reasonably anticipated to be a carcinogen," but is not considered to be a "select carcinogen" under the criteria of the OSHA Laboratory Standard.

건강위험

Toxic routes of exposure to lead are food,water, and air. It is an acute as well as achronic toxicant. The toxic effects depend onthe dose and the nature of the lead salt. Ingestionof lead paint chips is a common causeof lead poisoning among children. Chronictoxic effects may arise from occupationalexposure.
Acute toxic symptoms include ataxia,repeated vomiting, headache, stupor, hallucinations,tremors, convulsions, and coma.Such symptoms are manifested by the encephalopathicsyndrome. Chronic exposure can effects, anemia, and damage to the kidney.Lead can severely affect the nervous system.Chronic lead poisoning adversely affectsthe central and peripheral nervous systems,causing restlessness, irritability, and memoryloss. At lead concentrations of >80μg/dL,encephalopathy can occur. Cerebral edemaneuronal degenerationa and glial proliferationcan occur. The clinical symptoms areataxia, stupor, convulsion, and coma. Epidemiologicstudies in recent years have primarilyfocussed on the neurotoxic effectsof lead on children, especially in terms ofimpaired brain ability and behavioral problems.Permanent brain damage has beennoted among children from lead poisoning.Kidney damage arising from shorttermingestion of lead is reversible: whilea longer-term effect may develop to generaldegradation of the kidney, causing glomularatrophy, interstitial fibrosis, and sclerosisof vessels (Manahan 1989). Inhalation oflead justs can cause gastritis and changes inthe liver. Lead is significantly bioaccumulatedin bones and teeth, where it is storedand released. It binds to a number of cellularligands, interfering with some calciumregulatedfunctions. Lead has an affinity forsulfhydryl groups (-SH), which are presentin many enzymes. Thus it inhibits enzymaticactivity. One such effect is the inhibitionof δ-amino-levulinic acid dehydrates(ALAD) an enzyme required for the biosynthesisof heme, an iron(II)–porphyrin complexin hemoglobin and cytochrome. Anotherenzyme which is also highly susceptible tothe inhibitory effect of lead is heme synthetase.The impaired heme synthesis maycause anemia. The clinical anemia is perceptibleat a blood-lead level of 50 μg/dL. Concentrationsof lead in the blood at levels of10 μg/dL can cause ALAD inhibition. Carcinogenicityof lead has not been observedin humans; the evidence in animals is inadequate.
Suwalsky et al. (2003) studied the effectsof lead on the human erythrocyte membranes using isolated unsealed membranes andmolecular models consisting of bilayers ofdimyristoylphosphatidylcholine and dimyristoylphosphatidylethanolaminerepresentingphospholipids in the outer and inner monolayersof human erithrocyte membrane. Resultsof this study indicated that lead particlesadhered to the external and internal surfacesof human erithrocyte membrane and lead ionsinduced considerable molecular disorder inboth lipid multilayers.
Cremin et al. (1999) investigated the efficacyof chelation of lead with meso-2,3-dimercaptosuccinic acid in reducing the leadlevels in the brain and its neurotoxicity fromchronic oral exposure of the metal in adultrhesus monkeys. Their data, however, indicatedthat under the conditions of their studysuccimer treatment did not reduce brain leadlevels in the primate model and also the limitationsin the use of blood-lead level as anindicator of treatment efficacy.

화재위험

Flash point data for Lead are not available, however, Lead is probably non-combustible.

인화성 및 폭발성

Lead powder is combustible when exposed to heat or flame.

공업 용도

Not only is lead the most impervious of all common metals to x-rays and gamma radiation, it also resists attack by many corrosive chemicals, most types of soil, and marine and industrial environments. Although lead is one of the heaviest metals, only a few applications are based primarily on its high density. The main reasons for using lead often include low melting temperature, ease of casting and forming, good sound and vibration absorption, and ease of salvaging from scrap.
With its high internal damping characteristics, lead is one of the most efficient sound attenuators for industrial, commercial, and residential applications. Sheet lead, lead-loaded vinyls, lead composites, and lead-containing laminates are used to reduce machinery noise. Lead sheet with asbestos or rubber sandwich pads are commonly used in vibration control.

공업 용도

lead has been under investigation for use as anticancer and antimicrobial agent, but so far with limited success.
Lead is obtained from its sulfide (PbS, galena), which is first roasted in the presence of oxygen and then reduced with carbon to give elemental Pb.
Lead is a greymetal and most lead is used in batteries.Other major uses, such as in plumbing or as antiknock agent in petrol (tetraethyl lead, Pb(C2H5)4), have declined over recent years because of the high toxicity of lead. Pb is a neurotoxin when ingested and many lead compounds are water soluble. Therefore, water lines have been replaced by specialised plastic material, and in most industrialised countries only unleaded petrol is sold.

Carcinogenicity

Lead and lead compounds are reasonably anticipated to be human carcinogens based on limited evidence of carcinogenicity from studies in humans and sufficient evidence of carcinogenicity from studiesin experimental animals.

환경귀착

Lead in the earth’s crust is about 15–20 mg kg1. Lead occurs naturally in the environment. However, most of the lead dispersed throughout the environment comes from human activities. Before the use of leaded gasoline was limited, most of the lead released into the US environment came from car exhaust. Because the EPA has limited the use of leaded gasoline, the amount of lead released into the air has decreased. Other sources of lead released into the air include burning fuel, such as coal or oil, industrial processes, and burning solid waste.
The release of lead to air is now less than the release of lead to soil. Most of the lead in inner city soils comes from landfills and leaded paint. Landfills contain waste from lead ore mining, ammunition manufacturing, and other industrial activities such as battery production. Very little lead goes directly into water. Higher levels of lead from car exhausts can be measured near roadways. Very low levels of lead from car exhausts are found at distances of 25m (82 ft) from the road edge. However, once lead goes into the atmosphere, it may travel thousands of miles if the lead particles are small or if the lead compounds are volatile. Lead is removed from the air by rain as well as by particles falling to the ground or into surface water. Once lead deposits on soil, it usually sticks to soil particles. Small amounts of lead may enter rivers, lakes, and streams when soil particles are displaced by rainwater. Lead may remain stuck to soil particles in water for many years. Movement of lead from soil particles into underground water or drinking water is unlikely unless the water is acidic or ‘soft.’ Some of the chemicals that contain lead are broken down by sunlight, air, and water to other forms of lead. Lead compounds in water may combine with different chemicals depending on the acidity and temperature of the water. The lead atom cannot be broken down.
The levels of lead may build up in plants and animals from areas in which air, water, or soil are contaminated with lead. If animals eat contaminated plants or animals, most of the lead they eat will pass through their bodies. The small amount absorbed can cause harmful effects. The amount of lead in paints sold for consumer use may not exceed 0.06%. Releases from lead-based paints are frequently confined to the area in the immediate vicinity of painted surfaces, and deterioration or removal of the paint can result in high localized concentrations of lead in indoor air and on exposed surfaces. Sandblasting procedures to remove paint may disperse lead into the local environment.
The largest volume of organolead vapors released to the atmosphere results from industrial processes such as primary and secondary nonferrous metal smelting, and from the use of leaded gasoline, which contains tetraethyl lead as an antiknock additive. These vapors are photoreactive, and their presence in the local atmosphere is transitory. Halogenated lead compounds are also formed and, ultimately, oxides and carbonates. Tetra-alkyl lead compounds have been found to contribute 5–10% of the total particulate lead present in the atmosphere. Organolead vapors are most likely to occur in occupational settings (e.g., gasoline transport and handling operations, gas stations, and parking garages) and high traffic areas.
Although aquatic releases from industrial facilities are expected to be small, lead may be present in significant levels in drinking water. In areas receiving acid rain (e.g., northeastern United States) the acidity of drinking water may increase, thus increasing the corrosivity of the water, which may, in turn, result in the leaching of lead from water systems, particularly from older systems during the first flush of water through the pipes. Fish in more acidic waters accumulate more lead than fish in a more alkaline environment.
The grounding of household electrical systems to the plumbing can increase corrosion rates and the subsequent leaching of lead from the lead solder used for copper pipes. Areas in which the pH of the water is <8.0 may have higher lead drinking water levels as well.
Canning foods in lead-soldered cans may increase levels of lead 8- to 10-fold; however, the impact of canning appears to be decreasing as a result of a decrease in the use of leadsoldered cans. Additional exposure to lead through dietary intake by people living in an urban environment is estimated to be ~ 28 mg day-1 for adults and 91mg day-1 for children, all of which can be attributed to atmospheric lead (dust). Atmospheric lead may be added to food crops in the field or garden (through uptake from soil and from direct deposition onto crop surfaces), during transport to market, processing, and kitchen preparation.
Lead may leach from lead crystal decanters and glasses into the liquids they contain. Flaking paint, paint chips, and weathered powdered paint, which are most commonly associated with deteriorated housing stock in urban areas, are major sources of lead exposure for young children residing in these houses, particularly for children with pica (i.e., the compulsive, habitual consumption of nonfood items). Lead concentrations of 1000–5000 mg cm-2 have been found in chips of lead-based paint, suggesting that consumption of a single chip of paint would provide greater short-term exposure than any other source of lead.

저장

work with lead dust, molten lead, and lead salts capable of forming dusts should be conducted in a fume hood to prevent exposure by inhalation.

Toxicity evaluation

Lead can affect most organs and systems in the body. It can interfere with certain cellular signaling processes, the generation of action potentials in certain nerve cells, and the function of a number of enzymes. Lead interferes with the sodium– potassium ATPase pump on cell membranes, the metabolism of vitamin D, heme synthesis, certain enzymes involved in oxidative phosphorylation (cytochromes), and calcium uptake and metabolism. In addition, lead can interfere with signal transmissions in nerve cells, including dopaminergic transmissions and signaling processes at the postsynaptic and presynaptic junctions. Lead can depress the function of the adrenal glands and the thyroid.
Lead binds certain active groups on protein (e.g., sulfhydryl groups) and therefore may change the structure and function of certain proteins and enzymes. Lead interferes with the biosynthesis of heme in at least two steps in the multi-step process. Heme proteins are important to the structure and function of hemoglobin in red blood cells. Lead binds with 8-aminolevulinic acid dehydratase and depresses its activity. This biochemical block explains the occurrence of anemia found in chronic lead poisoning. Measurement of the blood levels of this enzyme is used as a test for lead intoxication. Lead also interferes with the incorporation of ferrous iron into the porphyrin ring. If iron is not attached to heme, then zinc will occupy the iron-binding site. The concentration of zinc protoporphyrin also can be used as a diagnostic tool for lead poisoning.

비 호환성

Violent reactions of lead with sodium azide, zirconium, sodium acetylide, and chlorine trifluoride have been reported. Reactivity of lead compounds varies depending on structure.

폐기물 처리

Excess lead and waste material containing this substance should be placed in an appropriate container, clearly labeled, and handled according to your institution's waste disposal guidelines. For more information on disposal procedures, see Chapter 7 of this volume.

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