ISO 2590-1973 测定砷的一般方法 二乙基二硫代氨基甲酸银光度法

标准号：ISO 2590-1973
中文标准名称：测定砷的一般方法 二乙基二硫代氨基甲酸银光度法
英文标准名称：General method for the determination of arsenic; Silver diethyldithiocarbamate photometric method
标准类型：G04;N33
发布日期：1999/12/31 12:00:00
实施日期：1999/12/31 12:00:00
中国标准分类号：G04;N33
国际标准分类号：71.060.10
适用范围：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.