Specifications of Potassium Chloride USP Grade
KCl --- 74.55

Assay: Potassium Chloride contains not less than 99.0 percent and not more than 100.5 percent of KCl, calculated on the dried basis.
Identification: A solution (1 in 20) responds to the tests for Potassium and for Chloride.
Acidity or alkalinity: To a solution of 5.0 g in 50 mL of carbon dioxide–free water add 3 drops of phenolphthalein: no pink color is produced. Then add 0.30 mL of 0.020 N sodium hydroxide: a pink color is produced.
Loss on drying: Dry it at 105 for 2 hours: it loses not more than 1.0% of its weight.
Iodide or bromide:
IODIDE: To pass the test. -- the limit is 0.005%.
BROMIDE: To pass the test. -- the limit is 0.1%.
Aluminum: where it is labeled as intended for use in hem dialysis to pass the test: --- the limit is 1 µg per g.
Calcium and magnesium: To 20 mL of a solution (1 in 100) add 2 mL each of 6 N ammonium hydroxide, ammonium oxalate and dibasic sodium phosphate: no turbidity is produced within 5 minutes.
Sodium: A solution (1 in 20), tested on a platinum wire, does not impart a pronounced yellow color to a non-luminous flame.
Heavy metals: Dissolve 2.0 g in 25 mL of water: the limit is 0.001%.
Organic volatile impurities: meets the requirements.

Specifications of Potassium Chloride BP Ph Eur Grade
KCl 74.55

DEFINITION
Content: 99.0 per cent to 100.5 per cent of KCl (dried substance).

CHARACTERS
Appearance: White or almost white, crystalline powder or colorless crystals.
Solubility: Freely soluble in water, practically insoluble in anhydrous ethanol.

IDENTIFICATION
It gives the reactions of chlorides.
Solution S gives the reactions of potassium.

TESTS
Solution S: Dissolve 10.0 g in carbon dioxide-free water prepared from distilled water and dilute to 100 ml with the same solvent.
Appearance of solution: Solution S is clear and colorless.
Acidity or alkalinity: To 50 ml of solution S add 0.1 ml of bromothymol blue solution. Not more than 0.5 ml of 0.01 M hydrochloric acid or 0.01 M sodium hydroxide is required to change the color of the indicator.
Bromides: Maximum 0.1 per cent.
Iodides: Moisten 5 g by the drop wise addition of a freshly prepared mixture of 0.15 ml of sodium nitrite solution, 2 ml of 0.5 M sulphuric acid, 25 ml of iodide-free starch solution and 25 ml of water. After 5 min, examine in daylight. The substance shows no blue color.
Sulphates: Maximum 300 ppm.
Aluminium: Maximum 1.0 ppm, if intended for use in the manufacture of hem dialysis solutions.
Barium: To 5 ml of solution S add 5 ml of distilled water and 1 ml of dilute sulphuric acid. After 15 min, any opalescence in the solution is not more intense than that in a mixture of 5 ml of solution S and 6 ml of distilled water.
Iron: Maximum 20 ppm.
Magnesium and alkaline-earth metals: Maximum 200 ppm, calculated as Ca.
Sodium: Maximum 0.10 per cent, if intended for use in the manufacture of parenteral preparations or hem dialysis solutions.
Heavy metals: Maximum 10 ppm.
Loss on drying: Maximum 1.0 per cent, determined on 1.000 g by drying in an oven at 105 C for 3h.

Specifications of Potassium Chloride IP Grade:
Dry Basis Assay (KCl): 99.0% Potassium Chloride
Description: White, crystalline powder, odorless.
Solubility: Freely soluble in water; sparingly soluble in ethanol (95%).
Matter Insoluble in Water: Clear & colourless solution (10% KCl w/w).
Acidity or Alkalinity: Passes the Test
Barium: Passes the Test
Arsenic: 1 ppm max.
Iron: 20 ppm max.
Calcium & Magnesium: Passes the Test
Sulphate: 300 ppm max.
Heavy Metals: 10 ppm max.
Bromide: 0.1%
Iodide: Passes the Test
Loss on Drying: 1.0% max.

Specifications of Potassium Chloride FCC Food Grade
KCl -- 74.55

DESCRIPTION: Potassium Chloride occurs as colorless, elongated, prismatic, or cubical crystals, or as a white, granular powder. It is stable in air. Its solutions are neutral to litmus. It may contain up to 1.0% (total) of suitable food-grade ant-caking, free-flowing, or conditioning agents such as calcium stearate or silicon dioxide, either singly or in combination. One gram dissolves in 2.8 mL of water at 25C and in about 2 mL of boiling water. Potassium Chloride containing anti-caking, free-flowing, or conditioning agents may produce cloudy solutions or dissolve incompletely. It is insoluble in alcohol.
Function: Nutrient; gelling agent; salt substitute; yeast food.

REQUIREMENTS:
Identification: A 1:20 aqueous solution gives positive tests for Potassium and for Chloride.
Assay: Not less than 99.0% of KCl after drying; and not less than 98.0% of KCl after drying when a sample contains added substance.
Acidity or Alkalinity: A sample containing no added substance passes test.
Heavy Metals (as Pb): Not more than 5 mg/kg.
Iodide and/or Bromide: Passes test.
Loss on Drying: Not more than 1.0%.
Sodium: Passes test.

REQUIREMENTS:
Identification: A 1:20 aqueous solution gives positive tests for Potassium and for Chloride.
Assay: Not less than 99.0% of KCl after drying; and not less than 98.0% of KCl after drying when a sample contains added substance.
Acidity or Alkalinity: A sample containing no added substance passes test.
Heavy Metals (as Pb): Not more than 5 mg/kg.
Iodide and/or Bromide: Passes test.
Loss on Drying: Not more than 1.0%.
Sodium: Passes test.

Potassium Chloride Analytical Reagent Grade Specifications
Formula Weight 74.55
CAS Number 7447-40-7

REQUIREMENTS
Assay: 99.0-100.5% KCl
pH of a 5% solution: 5.4-8.6 at 25C.

MAXIMUM ALLOWABLE
Insoluble matter: 0.005%
Iodide (I): 0.002%
Bromide (Br): 0.01%
Chlorate and nitrate (as NO3): 0.003%
Nitrogen compounds (as N): 0.001%
Phosphate (PO4): 5 ppm
Sulfate (SO4): 0.001%
Barium (Ba): Passes test
Heavy metals (as Pb): 5 ppm
Iron (Fe): 3 ppm
Calcium (Ca): 0.002%
Magnesium (Mg): 0.001%
Sodium (Na): 0.005%..