ISO 4275:1977
Ammonium hydrogen carbonate for industrial use (including foodstuffs); Determination of arsenic content; Silver diethyldithiocarbamate photometric method

Standard No.

ISO 4275:1977

Release Date

1977

Published By

International Organization for Standardization (ISO)

Status

Withdraw 2002-05

Latest

ISO 4275:1977

Scope

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).

ISO 4275:1977 history

• 1977 ISO 4275:1977 Ammonium hydrogen carbonate for industrial use (including foodstuffs); Determination of arsenic content; Silver diethyldithiocarbamate photometric method