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ISO 3359:1975 PDF
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Phosphoric acid for industrial use — Determination of arsenic content — Silver diethyldithiocarbamate photometric method
Applicable to products having As contents of more than 0.1 mg/kg. Relates to the method of analysis according to ISO 2590. Reduction of the As by zinc in a hydrochloric acid solution 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. Determination of the quantity of As by means of the calibration curve.
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| Edition | 1975 |
|---|---|
| Published Date | 1975 |
| Published By | International Standardization Organisation |
| Page Count | 2 |
