ISO 2465:1974 PDF
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Glycerols for industrial use — Determination of arsenic content — Silver diethyldithiocarbamate photometric method
The method is applicable tp products with a content greater than 0,1 mg/kg. It is applied to a test portion as it is, and to another identical portion with a known quantity of arsenic added. The principle consists in reduction of the arsenic by zinc in a hydrochloric acid medium, with the formation of arsine; absorption of the 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 at a wavelength of about 540 nm.
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| Edition | 1974 |
|---|---|
| Published Date | 1974 |
| Published By | International Standardization Organisation |
| Page Count | 3 |
