ISO 2590:1973
General method for the determination of arsenic — Silver diethyldithiocarbamate photometric method
Reference number
ISO 2590:1973
ISO 2590:1973
Edición 1
1973-05
1973-05
© ISO 2024
Retirada
Resumen
Applicable to determining the quantities contained either in all the test solution or in the aliquot portion of between 1 g and 20 g that is taken for the determination. The principle bases on the 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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