ISO 2590:1973 测定砷的一般方法.二乙基二硫化氨基甲酸银光度计法

标准编号：ISO 2590:1973

中文名称：测定砷的一般方法.二乙基二硫化氨基甲酸银光度计法

英文名称：General method for the determination of arsenic — Silver diethyldithiocarbamate photometric method

发布日期：1973-05

标准范围

适用于测定所有供试品溶液中所含的量，或测定所取1g至20g的等分部分中所含的量。该原理基于锌在盐酸介质中还原砷，生成砷化氢；砷化氢在二乙基二硫代氨基甲酸银吡啶溶液中的吸收。在约540 nm波长下，在吸收曲线最大值处对胶体分散银产生的紫红色进行光度测量。

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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