Numéro de référence
ISO 4275:1977
ISO 4275:1977
© ISO 2024
ISO 4275:1977
Bicarbonate d'ammonium à usage industriel (y compris les industries alimentaires) — Dosage de l'arsenic — Méthode photométrique au diéthyldithiocarbamate d'argent
Edition 1
1977-11
1977-11
Annulée
Résumé
Applicable to products having As contents more than 0.2 mg/kg. The principle consists in reduction of the element to arsine in a solution of silver diethyldithiocarbamate in pyridine. Photometric measurement of the purplish- red colour produced by the colloidally dispersed silver, at the maximum of the absorption curve (wavelength approximately 540 nm).