Arsemate

Organic chemicals and Derivatives

Storage: protect from light

Shipping Condition: Ambient Temperature

Chemical Name: Diethyldithiocarbamic acid, silver salt

CAS Number: 1470-61-7

Appearance: yellow crystalline

Absorbance (3.9x10-4 M in pyridine): >0.23 (350 nm)

Sensitivity (As): pass test

Arsemate is soluble in pyridine and chloroform, but insoluble in water and other organic solvents. For arsenic detection, a 0.5% Arsemate/pyridine solution is used. The sample should be treated with sulfuric acid, 15% potassium iodide and 40% SnCl2/HCl solution to convert arsenic to AsH3. Arsemate reacts with AsH3 in pyridine and forms red colloidal silver with maximum wavelength at 520-540 nm. The detection range of arsenic using the Arsemate/pyridine solution is 4-12 ppm. Alternatively, 0.5% Arsemate/chloroform solution with 30 mM triethylamine can be used for the assay. For the colorimetric detection of arsenic, the AsH3 gas generator is required.Solubility: 20 mg/ml hot pyridine, 5 mg/ml hot chloroform