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Aluminium Potassium Sulphate or Aluminum Potassium Sulfate or Potash Alum or Potassium Alum Manufacturer Exporter BP Ph Eur USP FCC Food AR ACS Grade Manufacturer Exporter
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Hazard Statements:
Not a hazardous substance or mixture according to Regulation (EC) No. 1272/2008.
This substance is not classified as dangerous according to Directive 67/548/EEC.
Not considered hazardous by the OSHA Hazard Communication Standard (29 CFR 1910.1200)
Signal Word: None
Transport Information
DOT USA, TDG Canada & ADR/RID Europe: Not dangerous goods.
IMO/IMDG: Not dangerous goods.
IATA/ICAO: Not dangerous goods.
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CAS Number 7784-24-9 Aluminium Potassium Sulphate or Aluminum Potassium Sulfate or Potash Alum or Potassium Alum, EINECS: 233-141-3, Molecular Weight: 474.39, Chemical Formula: AlK(SO4)2-12H2O
Alum BP Ph Eur Grade Specifications
Potash Alum BP
Aluminium Potassium Sulphate BP
AlK(SO4)2-12H2O -- 474.4 -- CAS 7784-24-9
DEFINITION
Content: 99.0 per cent to 100.5 per cent of AlK(SO4)2,12H2O.
CHARACTERS
Appearance: Granular powder or colourless, transparent, crystalline masses.
Solubility: Freely soluble in water, very soluble in boiling water, soluble in glycerol, practically insoluble in ethanol (96 per cent).
IDENTIFICATION
A. Solution S (see Tests) gives the reactions of sulphates.
B. Solution S gives the reaction of aluminium.
C. Shake 10 ml of solution S with 0.5 g of sodium bicarbonate R and filter. The filtrate gives reaction (a) of potassium.
TESTS
Solution S: Dissolve 2.5 g in water R and dilute to 50 ml with the same solvent.
Appearance of solution: Solution S is clear and colourless.
pH: 3.0 to 3.5.
Ammonium: Maximum 0.2 per cent.
Iron: Maximum 100 ppm.
Heavy metals: Maximum 20 ppm.
Potassium Alum USP Grade Specifications
Aluminum Potassium Sulfate USP
AlK(SO4)2-12H2O -- 474.39
Sulfuric acid, aluminum potassium salt (2:1:1), dodecahydrate.
Aluminum potassium sulfate (1:1:2) dodecahydrate CAS 7784-24-9
Anhydrous 258.21 CAS 10043-67-1
Potassium Alum contains not less than 99.0 percent and not more than 100.5 percent of AlK(SO4)2, calculated on the dried basis.
Identification:
A: Add 1 N sodium hydroxide drop wise to a solution of it (1 in 20): a precipitate is formed that dissolves in an excess of the reagent. Ammonia is not evolved (distinction from Ammonium Alum).
B: Hold it in a non-luminous flame: a violet color is imparted to the flame.
C: Add 10 mL of sodium bitartrate to 5 mL of a saturated solution of it: a white, crystalline precipitate is formed within 30 minutes.
D: A solution (1 in 20) responds to the tests for Aluminum and for Sulfate.
Loss on drying: Transfer 2.0 g, in a tarred porcelain crucible, to a muffle furnace at 200. Increase the temperature to 400 and dry at 400 to constant weight. Cool in a desiccator, and weigh: it loses between 43.0% and 46.0% of its weight.
Heavy metals: the limit is 0.002%.
Iron: Add 5 drops of potassium ferro-cyanide TS to 20 mL of a solution (1 in 150): no blue color is produced immediately.
Aluminum Potassium Sulfate FCC Food Grade Specifications
Potassium Alum FCC
AlK(SO4)2-12H2O Formula weight 474.38
INS: 522 CAS 7784-24-9
DESCRIPTION
Aluminum Potassium Sulfate occurs as large, transparent crystals or crystalline fragments, or as a white crystalline powder. One gram dissolves in 7.5 mL of water at 25C and in about 0.3 mL of boiling water. Its solutions are acid to litmus. It is insoluble in alcohol, but is freely soluble in glycerin.
REQUIREMENTS
Identification: A 1:20 aqueous solution gives positive tests for Aluminum, for Potassium, and for Sulfate.
Assay: Not less than 99.5% and not more than 100.5% of AlK(SO4)2-12H2O.
Ammonium Salts: Passes test.
Fluoride: Not more than 0.003%.
Lead: Not more than 3 mg/kg.
Selenium: Not more than 0.003%.
Aluminum Potassium Sulfate Dodecahydrate Analytical Reagent Grade Specifications
Potash Alum
AlK(SO4)2-12H2O
Formula Weight 474.39
CAS Number 7784-24-9
REQUIREMENTS
Assay: 98.0-102.0% AlK(SO4)2-12H2O
MAXIMUM ALLOWABLE
Insoluble matter: 0.005%
Chloride (Cl): 5 ppm
Ammonium (NH4): 0.005%
Heavy metals (as Pb): 0.001%
Iron (Fe): 0.001%
Sodium (Na): 0.02%
Contact for Monograph, Uses, Matnfacturing Process, etc of Aluminium Potassium Sulphate or Aluminum Potassium Sulfate or Potash Alum or Potassium Alum and JP IP BP Ph Eur USP NF FCC Food AR ACS Reagent Grade Manufacturer Supplier Exporter
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Last updated
11/19/2022
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