ISO 5993-1979 工业用氢氧化钠 汞含量的测定 无焰原子吸收光谱测定法

标准号：ISO 5993-1979
中文标准名称：工业用氢氧化钠 汞含量的测定 无焰原子吸收光谱测定法
英文标准名称：Sodium hydroxide for industrial use; Determination of mercury content; Flameless atomic absorption spectrometric method
标准类型：G10
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：G10
国际标准分类号：71.060.40
适用范围：Covers a method applicable to liquid or solid products having mercury contents greater than 0,02 mg/kg. The principle of determination is based on oxidation of the mercury contained in a test portion to mercury(II) ions by potassium permanganate in the presence of sulphuric acid, reduction of the excess oxidant by hydroxylammonium chloride, reduction of the mercury(II) ions to mercury by tin(II) chloride, entrainment of the mercury in air or nitrogen, passage of the gaseous mixture through a measuring cell, and measurement of the absorption at a wavelength of 253,7 nm.