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Potassium iodide

Chemical properties Uses Medical Uses Adverse reactions Feed additives Radiation effects Solubility in water Preparation Identification test Toxicity
Potassium iodide
Potassium iodide
CAS No.
7681-11-0
Chemical Name:
Potassium iodide
Synonyms
I2;KI;K1-N;Pima;LUGOL;IODUM;Jodid;Kisol;IODIDE;Potide
CBNumber:
CB3125298
Molecular Formula:
IK
Formula Weight:
166
MOL File:
7681-11-0.mol

Potassium iodide Properties

Melting point:
113 °C(lit.)
Boiling point:
184 °C(lit.)
Density 
1.32 g/mL at 25 °C
vapor density 
9 (vs air)
vapor pressure 
0.31 mm Hg ( 25 °C)
refractive index 
1.677
Flash point:
1330°C
storage temp. 
Store at RT.
solubility 
H2O: 1 M at 20 °C, clear, colorless
form 
particles (round)
color 
Yellow
PH
6.0-9.0 (25℃, 1M in H2O)
Water Solubility 
1.43 kg/L
Sensitive 
Hygroscopic
Merck 
14,7643
Stability:
Stable. Protect from light and moisture. Incompatible with strong reducing agents, strong acids, steel, aluminium, alkali metals, brass, magnesium, zinc, cadmium, copper, tin, nickel and their alloys.
InChIKey
NLKNQRATVPKPDG-UHFFFAOYSA-M
CAS DataBase Reference
7681-11-0(CAS DataBase Reference)
NIST Chemistry Reference
Potassium iodide(7681-11-0)
EPA Substance Registry System
Potassium iodide (KI)(7681-11-0)
SAFETY
  • Risk and Safety Statements
  • Hazard and Precautionary Statements (GHS)
Hazard Codes  Xn
Risk Statements  26
Safety Statements  22-36/38
WGK Germany  1
RTECS  TT2975000
10
TSCA  Yes
HS Code  28276000
Hazardous Substances Data 7681-11-0(Hazardous Substances Data)
Toxicity Approx LD i.v. in rats: 285 mg/kg (Hildebrandt)
Symbol(GHS):
Signal word: Danger
Hazard statements:
Code Hazard statements Hazard class Category Signal word Pictogram P-Codes
H302 Harmful if swallowed Acute toxicity,oral Category 4 Warning P264, P270, P301+P312, P330, P501
H315 Causes skin irritation Skin corrosion/irritation Category 2 Warning P264, P280, P302+P352, P321,P332+P313, P362
H319 Causes serious eye irritation Serious eye damage/eye irritation Category 2A Warning P264, P280, P305+P351+P338,P337+P313P
H372 Causes damage to organs through prolonged or repeated exposure Specific target organ toxicity, repeated exposure Category 1 Danger P260, P264, P270, P314, P501
Precautionary statements:
P314 Get medical advice/attention if you feel unwell.
P305+P351+P338 IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing.

Potassium iodide price More Price(80)

Manufacturer Product number Product description CAS number Packaging Price Updated Buy
Sigma-Aldrich 03124 Potassium iodide 99.0-100.5% (calc. to the dried substance) 7681-11-0 6x1kg $1200 2017-11-08 Buy
Sigma-Aldrich 03124 Potassium iodide 99.0-100.5% (calc. to the dried substance) 7681-11-0 1kg $283 2017-11-08 Buy
Alfa Aesar 10842 Potassium iodide, Puratronic?, 99.998% (metals basis) 7681-11-0 5g $53.5 2017-11-08 Buy
Alfa Aesar 10842 Potassium iodide, Puratronic?, 99.998% (metals basis) 7681-11-0 25g $155 2017-11-08 Buy
Strem Chemicals 19-3200 Potassium iodide, 99+% (ACS) 7681-11-0 100g $40 2017-11-27 Buy

Potassium iodide Chemical Properties,Uses,Production

Chemical properties

Colorless or white cubic crystals or granules; becomes yellowish when exposed to bright light due to photochemical decomposition liberating traces of free iodine; density 3.13 g/cm3; melts at 681°C; vaporizes at 1,330°C; highly soluble in water, ~140 g/100mL at 20°C; aqueous solution readily dissolves iodine; sparingly soluble in ethanol (about 2 g/100mL at 25°C) and acetone; slightly soluble in ether and ammonia.

Uses

Industry Application Role/benefit
Dietary supplement Animal feeds and human diet Iodine fortifier/source of iodine
Medicine Goiter Goiter control agent/source of iodine
Long-term lung problems Expectorant/helps you cough up the mucus so you can breathe more easily
Thyroid protection during nuclear or radiological emergencies Blocks thyroid from absorbing radioactive iodine
Chemical analysis Chromatographic analysis and spot analysis Analytical reagent/easily be reduced to iodine
Chemical manufacture Manufacture of iodine compounds and dyes Raw material
Film photography Preparation of silver iodide (AgI) Raw material/react with silver nitrate to make silver iodide (AgI)
Biomedical research Quenching of fluorescence Fluorescence quenching agent/ iodide ion induces the collisional quenching of fluorescent substances
Organic synthesis Preparation of aryl iodides Iodizating agent
Others Dye sensitised solar cells Component in the electrolyte
Dissolution of iodine and refractory metal iodide Cosolvent

Medical Uses

Nuclear radiation
Shortly before or after exposure to nuclear radiation, daily intake of 130 mg of potassium iodide (adults) can effectively prevent the absorption of radioactive iodine by the thyroid, thereby reducing the accumulation of radioactive iodine, and reducing impair of radioactive iodine to the thyroid gland and nearby tissues.


Dermatological Diseases
Sporotrichosis: Potassium iodide, used either alone or in combination, has a significant effect in the treatment of spore mycosis.
Hypertrophic scars: Potassium iodide solution can inhibit the hyperplasis of scar tissue, dissipate the granulation tissue, soften the scar, loosen the adhesion, and eliminate chronic inflammation.
Erythema nodosum: Potassium iodide deposits in granuloma that cause mast cells to release heparin, thereby inhibiting the occurrence of delayed allergy.

Ophthalmic Diseases
Cataract
: Potassium iodide is one of the first drugs used to treat cataract. It is effective on lens regeneration and reducing lens epithelium damage in experimental naphthalene cataract.
Blepharitis: Application of 2% potassium iodide in eye skin is effective for styes patients with myosinosis, with a cure rate of 88.4%.
Vitreous opacity: Oral administration of 10% potassium iodide can effectively promote the bleeding in the vitreous body and absorption of exudate thus reducing the opacity of vitreous body.
Chronic bronchitis:10% potassium iodide solution has good efficaty in treating chronic bronchitis.
Lead nephropathy: Potassium iodide protects the renal cells from lead damage by either blocking lead diffusion or binding with lead in the cells as to protect the Na + -k + -atpase.
Hyperplasia of mammary glands: The small dose of potassium iodide can promote the secretion of luteinizing hormone in the anterior pituitary gland and promote the luteinization of the ovarian follicle, thus reducing the estrogen level and restoring the normal function of the ovary.

Others
In the treatment of temporomandibular joint disorders, periarthritis of shoulder, congenital muscular torticollis, cervical spondylosis vertigo, clinical studies have shown that applying potassium iodide can increase sympathetic nerve excitability, promote inflammation absorption, release the conglutination and soften the scar thus helping restore the functions of the nerve.

Adverse reactions

  1. Allergy, not common. It can occur immediately after taking the drug, or an angioedema may occur several hours later. It may happen in the upper limbs, lower extremities, face, lips, tongue, or throat. It may also have erythema, fever, or discomfort.
     
  2. Long-term use may cause oral, throat burning sensation, runny nose, metallic taste, tooth and gum pain, stomach discomfort, severe headache and other symptoms of iodine poisoning; hyperkalemia symptoms such as confusion, arrhythmia, numb and tingling feeling in hands and feet, and weakness of lower limbs may also occur. Stop taking medicine to subside.
     
  3. Gastrointestinal adverse reactions such as diarrhea, nausea, vomiting, and stomach pain may occur, though uncommon.
     
  4. Effects on thyroid function: Excessive iodine can cause hyperthyroidism or hypothyroidism. Recession or inhibition of thyroid function can lead to excessive secretion of TSH and even goiter.
     
  5. Combination with anti-thyroid drugs may cause hypothyroidism and goiter; combination with angiotensin converting enzyme inhibitors or with potassium-sparing diuretics is prone to hyperkalemia, so potassium should be monitored in these cases; combination with lithium salts may cause hypothyroidism and goiter.

Feed additives

Potassium iodide is ionic compound which iodine ions and silver ions can form yellow precipitate silver iodide (when exposes to light, it can decompose, it can be used to make high-speed photographic film), silver nitrate can be used to verify the presence of iodine ions. Iodine is ingredient of thyroxine, it is closely related to basal metabolism livestock, it participates in almost all the metabolism process, livestock iodine deficiency can cause thyroid hypertrophy, basal metabolic rate dropps, and affects growth and development. Young animals and animal feed of iodine deficiency area need add iodine, iodine requirements of high producing dairy cows, yield hens should increase, the feed also need to add iodine. Iodine of milk and egg increases with dietary iodine. According to reports, periodate eggs can reduce cholesterol levels and good for the health of patients with hypertension. In addition, during the fattening of animals, though not iodine deficiency, in order to make livestock hypothyroidism strong, enhanced anti-stress, maintain the highest production capacity, iodide is also added, potassium iodide as the iodine source is added to feed, it can prevent iodine deficiency disorders, promote growth, increase egg production rate and reproduction rate and improve feed efficiency, the amount of feed is generally a few PPM, because of its instability, iron citrate and calcium stearate (generally 10%) is usually added as protective agent to make it stable.

Radiation effects

Various countries aim at surrounding residents of nuclear power plants to provide or reserves iodine tablets, the main ingredient is potassium iodide, when nuclear power plant occurs disaster and radiation leaks, the surrounding residents should take iodine tablets, iodine can saturate the thyroid gland and reduce absorption of radioactive iodine-131. When suffers the free iodine radiation exposure, within four hours can take effect, but it can not prevent ionizing radiation of iodine-131 exceptant and isotope. Improper use may cause hyperthyroidism symptoms without instructions for most people.

Solubility in water

Grams which dissolves in per 100 ml of water at different temperatures (℃):
128g/0 ℃; 136g/10 ℃; 144g/20 ℃; 153g/30 ℃; 162g/40 ℃; 168g/50 ℃
176g/60 ℃; 192g/80 ℃; 198g/90 ℃; 206g/100 ℃

Preparation

Potassium iodide is made by absorption of iodine in potassium hydroxide:
POTASSIUM IODIDE 7613I2 + 6KOH → 5KI + KIO3 + 3H2O
Most potassium iodate, KIO3 , is separated from the product mixture by crystallization and filtration. Remaining iodates are removed by evaporation of the solution and other processes, such as carbon reduction or thermal decompostion at 600ºC to iodide:
2KIO3 → 2KI + 3O2
Another method of preparation that does not involve the formation of iodate is by treating iron turnings with iodine solution. The product, ferrosoferric iodide, Fe3I8•16H2O, is boiled with 15 wt% potassium carbonate solution: Fe3I8•16H2O + 4K2CO3 → 8 KI + 4CO2 + Fe3O4 + 16H2O
A similar method is used to prepare potassium bromide, discussed earlier (see Potassium Bromide.)
Potassium iodide can be prepared by reacting hydriodic acid with potassium bicarbonate:
HI + KHCO3 → KI + CO2 + H2O
It is purified by melting in dry hydrogen.
Potassium iodide also may be obtained by various electrolytic processes.

Identification test

10% of the sample liquid potassium test (IT-27) and iodide test (IT-18), it is positive.

Toxicity

GRAS (FDA, §184.1634,2000).
Toxicity 1: See iodine.
Toxicity 2: It is generally recognized as safe (US Food and Drug Administration, 1985). The edible salt is in the amount of 0.01% or less.

Uses

manufacture of photographic emulsions; in animal and poultry feeds to the extent of 10-30 parts per million; in table salt as a source of iodine and in some drinking water; also In animal chemistry. In medicine,potassium iodide is used to regulate the thyroid gland.

Air & Water Reactions

Water soluble.

Reactivity Profile

Bromine trifluoride rapidly attacks the following salts: barium chloride, cadmium chloride, calcium chloride, cesium chloride, lithium chloride, silver chloride, rubidium chloride, potassium bromide, potassium chloride, Potassium iodide, rhodium tetrabromide, sodium bromide, sodium chloride, and sodium iodide [Mellor 2, Supp. 1:164, 165. 1956].

Health Hazard

May irritate eyes or open cuts.

Purification Methods

Crystallise it from distilled water (0.5mL/g) by filtering the near-boiling solution and cooling. To minimise oxidation to iodine, the process can be carried out under N2 and the salt is dried under a vacuum over P2O5 at 70-100o. Before drying, the crystals can be washed with EtOH or with acetone followed by pet ether. It has also been recrystallised from water/ethanol. After 2 recrystallisations, ACS/USP grade had Li and Sb at <0.02 and <0.01 ppm respectively. [Lingane & Kolthoff Inorg Synth I 163 1939.]

Potassium iodide Preparation Products And Raw materials

Raw materials

Preparation Products


Potassium iodide Suppliers

Global( 428)Suppliers
Supplier Tel Fax Email Country ProdList Advantage
Hebei Guanlang Biotechnology Co., Ltd.
+86-0311-66562153 whatsapp +8615203118427
+86-0311-66562153 sales@crovellbio.com CHINA 418 50
Shenzhen Sendi Biotechnology Co.Ltd.
0755-23311925 18102838259
0755-23311925 Abel@chembj.com CHINA 3218 55
Henan DaKen Chemical CO.,LTD.
+86-371-55531817
inquiry@dakenchem.com CHINA 22144 58
Henan Tianfu Chemical Co.,Ltd.
0371-55170693
0371-55170693 info@tianfuchem.com CHINA 20803 55
Shanghai Time Chemicals CO., Ltd.
+86-021-57951555
+86-021-57951555 jack.li@time-chemicals.com CHINA 1374 55
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View Lastest Price from Potassium iodide manufacturers

Image Release date Product Price Min. Order Purity Supply Ability Manufacturer
2018-09-13 Potassium iodide
7681-11-0
US $1.00 / G 100G 99.9% 50000tons Hebei Ruishun Trade Co.,Ltd

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