ISO 3359:1975
ISO 3359:1975


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.

Общая информация 

  •  :  Withdrawn
     : 1975-08
  •  : 1
  •  : ISO/TC 47 Chemistry
  •  :
    71.060.30 Acids

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