Potassium nitrite
Potassium nitrite
CAS: 7758-09-0
Molecular Formula: KNO2
Potassium nitrite - Names and Identifiers
| Name | Potassium nitrite |
| Synonyms | UN1488 HSDB 1216 CCRIS 3959 UNII-794654G42L POTASSIUM NITRITE Potassium nitrite POTASSIUM NITRITE R. G. Nitrousacidpotassiumsalt Nitrousacid,potassiumsalt Nitrous acid, potassium salt nitrousacid,potassiumsalt[qr] EPA Pesticide Chemical Code 076203 Potassium nitrite [UN1488] [Oxidizer] |
| CAS | 7758-09-0 |
| EINECS | 231-832-4 |
| InChI | InChI=1/K.HNO2/c;2-1-3/h;(H,2,3)/q+1;/p-1 |
Potassium nitrite - Physico-chemical Properties
| Molecular Formula | KNO2 |
| Molar Mass | 85.1038 |
| Density | 1,92 g/cm3 |
| Melting Point | 350°C (dec.)(lit.) |
| Boling Point | explodes at 537℃ [HAW93] |
| Water Solubility | Soluble in water, hot alcohol, liquid NH{3}Soluble in water, alcohol and ammonia. |
| Solubility | water: soluble0.35 part |
| Vapor Density | 2.9 (vs air) |
| Appearance | Solid |
| Specific Gravity | 1.915 |
| Color | White to slightly yellow |
| Odor | Odorless |
| Merck | 14,7649 |
| PH | 7-10 (50g/l, H2O, 20℃) |
| Storage Condition | Store at +5°C to +30°C. |
| Stability | Stability Stable, but strong oxidizer - contact with combustible material may lead to fire. Incompatible with strong reducing agents, strong acids, combustible materials, cyanides, ammonium salts. |
| Sensitive | Hygroscopic |
| Physical and Chemical Properties | White or light yellow columnar crystals. Easy deliquescence, soluble in liquid ammonia and water, alkaline aqueous solution. Slightly soluble in alcohol, not solution in acetone. In 350.C begins to decompose to form potassium oxide, and nitrogen oxide gas is released. Potassium nitrite as oxidant, toxic! Contact with organic matter. Combustible materials can be burned and exploded, and release toxic and irritating peroxygen nitrogen and nitrogen oxide gas. Mixing with iron salt or cyanide can be explosive. |
| Use | Organic synthesis used as reducing agent. Food chromogenic agents, chemical reagents, can also be used in the manufacture of aniline dyes and azo dyes, medicine, gold for nickel drill separation. |
Potassium nitrite - Risk and Safety
| Risk Codes | R8 - Contact with combustible material may cause fire R25 - Toxic if swallowed R50 - Very Toxic to aquatic organisms |
| Safety Description | S45 - In case of accident or if you feel unwell, seek medical advice immediately (show the label whenever possible.) S61 - Avoid release to the environment. Refer to special instructions / safety data sheets. |
| UN IDs | UN 1488 5.1/PG 2 |
| WGK Germany | 2 |
| RTECS | TT3750000 |
| TSCA | Yes |
| HS Code | 2834 10 00 |
| Hazard Class | 5.1 |
| Packing Group | II |
| Toxicity | LD50 orally in rabbits: 108 mg anion/kg, Dollahite, Rowe, Southwest. Vet. 27, 246 (1974) |
Potassium nitrite - Upstream Downstream Industry
| Raw Materials | Potassium carbonate Calcium nitrite Sodium nitrite |
Potassium nitrite - Nature
Open Data Verified Data
colorless transparent prism crystals or white, yellow granular or rod-like crystals. d 1.915; Melting point 441. Decomposition begins at 3 50 °c to form potassium oxide, and nitrogen oxide gas is evolved. Deliquescence. Soluble in 0. 35 parts of water, the aqueous solution is alkaline. Slightly soluble in ethanol, soluble in glycerol, insoluble in ethanol. Can be diluted acid decomposition to produce nitrite anhydride. Contact with organic matter, friction or impact, can cause combustion or explosion, and release toxic and irritating peroxygen nitrogen and nitrogen oxide gas.
Last Update：2025-06-10 22:55:16
Potassium nitrite - Preparation Method
Open Data Verified Data
potassium carbonate was dissolved in water, and after heating, an aqueous solution of sodium nitrite was added. The precipitated sodium carbonate crystals were filtered off and cooled to precipitate potassium nitrite crystals.
Last Update：2025-06-10 22:55:16
Potassium nitrite - Application
Open Data Verified Data
An Analytical reagent for the determination of amino acids, diiodide, strontium, urea, etc. It is also used in organic synthesis, steel analysis, etc.
Last Update：2025-08-19 16:24:40
Potassium nitrite - Safety
Open Data Verified Data
toxic l rabbit oral LDso:108mg (anion)/kg. Do not contact with organic matter, reducing agents, flammable materials or metal powders.
Last Update：2025-06-10 22:55:16
Potassium nitrite - Reference Information
| pH range | 7 - 10 |
| EPA chemical substance information | information provided by: ofmpeb.epa.gov (external link) |
| properties | white or light yellow columnar crystals. Easy deliquescence, soluble in liquid ammonia and water, alkaline aqueous solution. Slightly soluble in alcohols, not solution in acetone. At 350°C begins to decompose to form potassium oxide, and evolution of nitrogen oxide gas. Potassium nitrite as oxidant, toxic! Mixed with organic matter, combustible material contact can burn and explosion, and release toxic and irritating peroxygen nitrogen and nitrogen oxide gas, mixed with iron salt or cyanide will be explosive. Risk Classification and code GB5.1 class 5107. |
| Use | potassium nitrite is used as a reducing agent, food color reagent, chemical reagent in organic synthesis, can also be used for the manufacture of aniline dyes and azo dyes, medicine, gold for nickel drill separation. coloring agents for meat products; Antimicrobial agents. And meat muscle myoglobin can be formed in red metmyoglobin nitrite, so as to achieve the role of color (color). However, if used in excess, the α-methine group of the blood-red porphyrin ring may be nitrated. The formation of iron nitrite in green porphyrin. used as reducing agent in organic synthesis. Food color reagent, chemical reagent, can also be used for the manufacture of aniline dyes and azo dyes, medicine, gold for nickel drill separation. used as an analytical reagent, also used in organic synthesis and analysis of iron and steel potassium nitrite is a chromogenic agent allowed in our country. It in the role of lactic acid contained in the meat free nitrous acid, and then the decomposition of the nitroso (N0), the latter can be generated with myoglobin bright red nitroso myoglobin and protect the role of color, and can produce a special flavor. Potassium nitrite can also inhibit a variety of anaerobic clostridia, especially Clostridium botulinum. China's provisions can be used to salted livestock, poultry canned meat and meat products, the maximum use of 0.15g/kg; Residues (in sodium nitrite) meat products should not exceed 0.03g/kg, salted ham, Residues of 0.07g/kg, can also be used in canned meat should not exceed 0.05g/kg. determination of amino acids, cobalt, iodine, strontium and urea. Organic synthesis used as reducing agent. Food color reagent, can also be used in the manufacture of aniline dyes and azo dyes, medicine, gold for nickel drill separation. |
| solubility in water (g/100ml) | grams dissolved per 100ml of water at different temperatures (℃): 279G/0 ℃;292g/10 ℃;306g/20 ℃;320g/30 ℃;329g/40 ℃ 348g/60 ℃;376g/80 ℃;390g/90 ℃;410g/100 ℃ |
| identification test | solubility soluble in water; Slightly soluble in ethanol. Potassium test (1T-27) was positive. Nitrite test (1T-24) was positive. |
| content analysis | take 1G (accurate to mg) of sample after pre-drying on silica gel for 4H, dissolve in water and make the volume to 100.0. Take 10.0ml of this solution and add 50.0. In the mixed solution of 0.1mol/L potassium permanganate, ml water and 5ml sulfuric acid, the tip of the pipette should be kept below the liquid level. The solution was warmed to 40 °c and placed for 5min followed by addition of 0.1 of 25.0 mol/L oxalic acid. It is then heated to about 80 °c and titrated with 0.1mol/L potassium permanganate. Where x -- consumed 0.1mo! /L potassium permanganate volume, ml;W-sample mass, g. |
| toxicity | ADI 0-0.06mg/kg(NO2-); but not for infants under 3 months of age FAO/WHO,2001). Ld50200 mg/kg (rabbit, oral). Nitroso has a certain carcinogenic effect, the dosage should be strictly controlled. |
| usage limit | GB 2760-1996: same as "17304, sodium nitrite". EEC is used for cooking meat products, sausages and smoked fish. |
| production method | The tail gas containing a small amount of NO and NO2 emitted from the production of nitrate or nitric acid is absorbed by potassium hydroxide solution or potassium carbonate, because the separation of potassium nitrate and potassium nitrite is difficult, excess NO must be present in the gas phase to reduce the formation of potassium nitrate. At 132 ° C: When the absorption liquid is evaporated and concentrated, then cooled to 75 ° C crystallization, after separation, drying to obtain the product (can refer to the production of sodium nitrite). K2CO3 NO, NO2 → 2 kno2, CO2 was obtained from the Co-heating of potassium nitrate solution and lead. From the potassium hydroxide solution to absorb nitric oxide gas. |
| category | oxidant |
| toxicity grade | high toxicity |
| Acute toxicity | oral-rabbit LD50: 200 mg/kg |
| explosive hazard characteristics | mixed with reductant, sulfur, phosphorus, etc, friction can burst |
| flammability hazard characteristics | thermal decomposition of toxic nitrogen oxide gas |
| storage and transportation characteristics | The warehouse is ventilated and dried at low temperature; It is light and easy to discharge; It is combined with organic matter, reductant, sulfur and phosphorus combustible substances, separate storage of food raw materials |
| fire extinguishing agent | water and sand mist |
| toxic substance data | information provided by: pubchem.ncbi.nlm.nih.gov (external link) |
Last Update：2024-04-09 21:01:54
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Raw Materials for Potassium nitrite