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황산바륨

황산바륨
황산바륨 구조식 이미지
카스 번호:
7727-43-7
한글명:
황산바륨
동의어(한글):
바륨황산;에나멜화이트;바륨황산염(1:1);퍼매넌트화이트;황산바륨;황산,바륨염(1:1);과산화바륨;이산화바륨;바륨과산화물;바륨디산화물;바륨초과산화물;바륨설페이트;황산바륨
상품명:
Barium sulfate
동의어(영문):
hd85;epi-c;rugar;ba147;BARYTE;enecat;eneset;eweiss;e-z-ac;e-z-hd
CBNumber:
CB9854295
분자식:
BaO4S
포뮬러 무게:
233.39
MOL 파일:
7727-43-7.mol

황산바륨 속성

녹는점
1580 °C
끓는 점
decomposes at 1580℃ [KIR78]
밀도
4.5
저장 조건
Storage temperature: no restrictions.
용해도
water: insoluble
물리적 상태
powder
색상
White to yellow
Specific Gravity
4.5
수소이온지수(pH)
3.5-10.0 (100g/l, H2O, 20℃)suspension
수용성
0.0022 g/L (50 ºC)
Merck
14,994
Solubility Product Constant (Ksp)
pKsp: 9.97
안정성
Stable.
CAS 데이터베이스
7727-43-7(CAS DataBase Reference)
EPA
Sulfuric acid, barium salt (1:1)(7727-43-7)

안전

위험품 표기 Xn
위험 카페고리 넘버 20/21/22-36/37/38
안전지침서 22-24/25-36-26
WGK 독일 -
RTECS 번호 CR0600000
TSCA Yes
HS 번호 28332700
유해 물질 데이터 7727-43-7(Hazardous Substances Data)
독성 LD50 orally in Rabbit: > 20000 mg/kg

황산바륨 C화학적 특성, 용도, 생산

개요

Barium sulphate is available as odourless, tasteless, white or yellowish crystals or powder or polymorphous crystals. It is stable and insoluble or negligibly soluble in water, and on burning, it may produce sulphur oxides. It reacts violently with aluminium powder. It occurs naturally as mineral barite, barytes. It has wide use as inert filler and pigment extender in paints, primers, inks, plastics, floor tiles, paper coatings, polymer fibres, and rubber. It is used as the semi-transparent base (lake) for organic pigments and as a thixotropic weighting mud in oil well drilling. Barium sulphate is a contrast agent that is used to help x-ray diagnosis of problems in areas of the upper GI tract, like the oesophagus, the stomach, and/ or the small intestine. The raw barium sulphate has wide applications such as in the manufacture of lithopone, a white pigment in the manufacture of photographic paper, wallpaper and glassmaking, in battery plate expanders, and in heavy concrete for radiation shield.

화학적 성질

Fine, white or almost white powder, free from gritty particles.

화학적 성질

Barium sulfate is available as white powder or polymorphous crystals. It is stable, odor- less, insoluble, or negligibly soluble in water, and may produce sulfur oxides on burning. It occurs naturally as mineral barite (barytes). It has wide use as an inert i ller pigment extender in paints, primers, inks, plastics, l oor tiles, paper coatings, polymer i bers, and rubber. It is used as the semi-transparent base (lake) for organic pigments and as a thixo- tropic weighting mud in oil well drilling. Barium sulfate is radio-opaque and is used as bar- ium meal in medical x-ray diagnosis. Barium sulfate is a contrast agent that is used to help x-ray diagnosis of problems in areas of the upper GI tract, like the esophagus, the stomach, and/or the small intestine. Barium sulfate is the raw material for the manufacture of litho- pone, a white pigment, and is used in the manufacture of photographic paper, wallpaper, and glassmaking; in battery plate expanders; and in heavy concrete for radiation shield.

화학적 성질

Barium sulfate is a white crystalline solid.

물리적 성질

Barium sulfate has the molecular formula of BaSO4 and the molecular weight of 233.3896 g/mol. It can be prepared by the reaction of barium carbonate and sulfuric acid:
BaCO3+H2SO4?BaSO4+CO2+H2O
Barium sulfate is a soft crystalline solid. It is a rhombic crystal. The pure salt is white but the color of the mineral “barite” can vary between red, yellow, gray or green, depending on impurities. Its density is 4.50 g/cm3 and its refractive index is 1.64. It melts around 1580°C but decomposes above 1600°C. Its hardness is 4.3 to 4.6 Mohs. It is virtually insoluble in water (285 mg/l at 30°C) and insoluble in alcohol. Its Ksp is 1.1×10-10. It is soluble in concentrated sulfuric acid. The crystal structure of BaSO4 is known to be rhombic, with a space group pnma. The lattice parameters are: a=8.896? , b=5.462°, c=7.171 ?, V=348.4 ?3.
Silica is the prime impurity that can be removed as sodium fluorosilicate by treatment with hydrofluoric acid followed by caustic soda. Very pure barium sulfate may be obtained by treating an aqueous solution of a soluble barium salt with sodium sulfate:
BaCl2+Na2SO4?BaSO4+2NaCl
Barium sulfate is one of the most insoluble salts of the alkaline earths. It does not undergo double decomposition reactions in aqueous phase like its Mg homologue.
It dissolves in concentrated H2SO4 to form an acid sulfate that breaks down to BaSO4 upon dilution. Reduction with coke under heating produces barium sulfide:
BaSO4+3C?BaS+2CO+CO2

용도

Barium sulfate has many commercial applications. It is used either as natural barite, or precipitated BaSO4. The precipitated salt in combination with equimolar amount of co-precipitated zinc sulfide formerly was used as a white protective coating pigment, known as “lithopone”. Similarly, in combination with sodium sulfide, it is used to produce fine pigment particles of uniform size, known as “blanc fixe”. Natural barite, however, has greater commercial application than the precipitated salt. It is used as an additive in drilling mud in crude oil, well drilled to lubricate and cool the drilling bit, and to plaster the walls of the drill hole to prevent caving. It is used as a filler in automotive paints, plastics and rubber products. It also is used as a filler in polyurethane foam floor mats, white sidewall rubber tires and as a flux and additive to glass to increase the refractive index.
Barium sulfate is frequently used clinically as a contrast agent for X-ray imaging and other diagnostic procedures. It is most often used in imaging of the gastrointestinal tract. It is administered, orally or by enema, as a suspension of fine particles in an aqueous solution. Although barium, and its water-soluble compounds are often highly toxic, the extremely low solubility of barium sulfate protects the patient from absorbing harmful amounts of the metal. Barium sulfate is also readily removed from the body, unlike prior compounds, which it replaced. Its absorbance of Xrays is also higher.
Barium sulfate mixtures are used as white pigment for paints. In oil paint, barium sulfate is almost transparent, and is used as a filler or to modify consistency. One major manufacturer of artists’ oil paint sells “permanent white” that contains a mixture of titanium white pigment and barium sulfate. Barium sulfate itself is called blanc fixe (French for “permanent white”).
range. It is applied by spray painting to almost any substrate (metals, plastics, glass) for use in integrating spheres, laser cavities, lamp reflectors and display backlights. It is characterized by a near-perfect Lambertian (i.e. diffuse) reflectance of up to 98% in the spectral range from 250 to 2500 nm.
Other chemical applications of barium sulfate are used as a pigment for photographic paper. It is also used to prepare many other barium salts. It is available in many forms commercially.

용도

A heavy, white powder made by treating barium salts with sulfuric acid. Barium sulfate was used as a preliminary coating for raw photographic papers to produce a smooth, white surface and to act as a barrier to prevent reactions between the paper and subsequent coatings of gelatin or collodion emulsions. Barium sulfate was also added directly to emulsions to produce a matte finish. It is also known as barite, synthetic barite, blanc fix, baryta white, and mountain snow.

용도

Finepowder Barium Sulphate is widely used in chemical industrypaint, plastics, rubber,glass, paper, medicine,ceramics, storage battery and other areas;Fine powder Barium Sulphate is widely used in chemical industry

용도

barium sulfate is an emulsion stabilizer for sunscreen formulations. outside of sunscreen preparations, this inorganic salt is most commonly used in non-cosmetic soaps.

용도

manufacture of photographic papers, artificial ivory, cello-phane; filler for rubber, linoleum, oil cloth, polymeric fibers and resins, paper, lithographic inks; as a water-color pigment for colored paper, in wallpaper; as a size for modifying the colors of other pigments; in heavy concrete for radiation shield.

정의

ChEBI: A metal sulfate with formula BaO4S. Virtually insoluble in water at room temperature, it is mostly used as a component in oil well drilling fluid it occurs naturally as the mineral barite.

상표명

Baricon (Mallinckrodt); Bar-test (Glenwood); Barocat (Mallinckrodt); Barosperse (Mallinckrodt); Barosperse II (Mallinckrodt); Barotrast (Rhone-Poulenc Rorer); Epi-C (Mallinckrodt); Epi-Stat 57 (Mallinckrodt); Epi-Stat 61 (Mallinckrodt); Esophotrast (Rhone-Poulenc Rorer); Oratrast (Rhone-Poulenc Rorer).

일반 설명

White or yellowish odorless powder or small crystals. Mp: 1580°C (with decomposition). Density: 4.25 -4.5 g cm-3. Insoluble in water, dilute acids, alcohol. Soluble in hot concentrated sulfuric acid. Used as a weighting mud in oil-drilling, in paints, paper coatings, linoleum, textiles, rubber. Administered internally (barium cocktail) as a radio-opaque diagnostic aid.

일반 설명

Commercial preparations of barium sulfatediffer in their density and ability to coat the bowel wall.These characteristics are determined by the particle size of thebarium suspension, its viscosity, and concentration of thecontrast agent. Flavoring agents, suspending agents, and otheradditives may be utilized in preparing various products.
Barium sulfate preparations are given orally or rectallyand are used to study the esophagus, stomach, duodenum,entire small bowel, colon, or the total bowel. Most patientsfind the taste of these flavored mixtures tolerable, but theydislike the heavy texture of the barium.
Concentrated barium suspensions ranging from 50% to210% weight/volume (wt/vol) are frequently used for traditionalradiographic imaging. Dilute suspensions rangingfrom 1.5% to 5% weight/volume (wt/vol) are typically usedfor CT studies.
The quantity and concentration of barium sulfate suspensionadministered to the patient will depend on the selectedprocedure. In general, upper GI studies will administer thecontrast agent just prior to imaging, whereas lower GI studiesrecommend intake several hours prior to the procedure.For total bowel opacification, the patient should consumecontrast agent the night preceding the examination, additionalagent a few hours prior to examination, and a thirddose approximately 15 minutes prior to examination.

반응 프로필

Barium sulfate is non-combustible and non-toxic. Emits toxic sulfur oxides when heated to decomposition. Can act as an oxidizing agent, but usually does not. Reacts with reducing agents such as potassium, phosphorus or aluminum (heating with aluminum can cause an explosion).

위험도

Pneumoconiosis.

건강위험

Exposures to barium sulfate cause irritation to the eyes, lachrimation; redness, scaling, and itching are characteristics of skin inl ammation. Although barium sulfate has been identi- i ed as a non-toxic dust, long-term inhalation of dust in high concentrations has caused benign pneumoconiosis (baritosis), deposition of dust in the lungs in sufi cient quantities to produce adverse effects. This produces a radiological picture even though symptoms and abnormal signs may not be present. The Fumes of barium are respiratory irritants and over-exposure to dusts and fumes is known to cause rhinitis, frontal headache, wheezing, laryngeal spasm, salivation, and anorexia. Long-term effects include nervous disorders and adverse effects on the heart, circulatory system, and musculature. Heavy exposures to barium sulfate may cause benign pneumoconi in exposed workers. However, there are no reports indicating that barium sulfate has potential occupational hazards or carcinogenicity.

Pharmaceutical Applications

Barium salts can be highly toxic even at low concentrations. Barium carbonate is highly toxic and can be used as rat poison as it readily dissolves in the stomach acid. Barium sulfate is the least toxic barium compound mainly because of its insolubility. Barium sulfate is used in a variety of applications ranging from white paint to X-ray contrast agent. The clinical use of barium sulfate suspension is well known under the term barium meal. Patients are given a suspension of barium sulfate to swallow. Using X-ray imaging, the whole oesophagus, the stomach and the intestines can be visualised. Barium sulfate lines the tissue whilst travelling through the digestive tract. The heavy barium ions absorb X-rays readily and therefore these structures become visible in an X-ray screening. Barium sulfate is a well-used and tolerated oral radio-contrast agent. It is also used as radio-contrast agent in enemas.

Safety Profile

Questionable carcinogen with experimental tumorigenic data. Mutation data reported. A relatively insoluble salt used as an opaque medium in radtography. Soluble impurities can lead to toxic reactions. Heating with aluminum can produce an explosion. Incompatible with aluminum and potassium. When heated to decomposition it emits toxic fumes of SOx.

잠재적 노출

Barium sulfate is used as an opaque medium in radiography; as a mud weighting material in oil well drilling; in paper coating; as a paint pigment.

응급 처치

Move victim to fresh air. Call 911 or emergency medical service. Give artificial respiration if victim is not breathing. Do not use mouth-to-mouth method if victim ingested or inhaled the substance; give artificial respiration with the aid of a pocket mask equipped with a one-way valve or other proper respiratory medical device. Administer oxygen if breathing is difficult. Remove and isolate contaminated clothing and shoes. In case of contact with substance, immediately flush skin or eyes with running water for at least 20 minutes. For minor skin contact, avoid spreading material on unaffected skin. Keep victim warm and quiet. Effects of exposure (inhalation, ingestion, or skin contact) to substance may be delayed. Ensure that medical personnel are aware of the material(s) involved and take precautions to Barium Sulfate 357 protect themselves. Medical observation is recommended for 24 to 48 hours after breathing overexposure, as pulmonary edema may be delayed. As first aid for pulmonary edema, a doctor or authorized paramedic may consider administering a drug or other inhalation therapy.

저장

Barium sulfate should be kept stored in its original sealed glass container with proper security when not in use. Barium sulfate should be stored in a cool, dry, ventilated area, away from incompatible materials and foodstuff containers. The containers need to be protected against physical damage and checked regularly for leaks.

운송 방법

UN1564 Barium compounds, n.o.s., Hazard Class: 6.1; Labels: 6.1—Poisonous materials.

비 호환성

May act as an oxidizer. Reacts with reducing agents such as hydrides, potassium, phosphorus or aluminum. Aluminum powder1heat may be violent; possibly explosive.

주의 사항

Barium sulfate should only be used by or under the direct supervision of a qualii ed super- visor or doctor. During use and handling of barium sulfate, workers should avoid contact of the chemical substance with the skin and should not breathe dust. After use, the work- ers should wash their hands with soap and water. While dispensing, care is needed to label barium sulfate properly and correctly, to avoid confusion with poisonous barium suli de, suli te, or carbonate.

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