ISO 3359:1975
Phosphoric acid for industrial use; Determination of arsenic content; Silver diethyldithiocarbamate photometric method
- Standard No.
- ISO 3359:1975
- Release Date
- 1975
- Published By
- International Organization for Standardization (ISO)
- Status
- 2002-05
- Latest
- ISO 3359:1975
- Scope
- 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.
ISO 3359:1975 history
- 1975 ISO 3359:1975 Phosphoric acid for industrial use; Determination of arsenic content; Silver diethyldithiocarbamate photometric method
