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

标准编号：ISO 5993:1979

中文名称：工业用氢氧化钠.汞含量的测定.火焰原子吸收光谱测定法

英文名称：Sodium hydroxide for industrial use — Determination of mercury content — Flameless atomic absorption spectrometric method

发布日期：1979-09

标准范围

涵盖适用于汞含量大于0.02 mg/kg的液体或固体产品的方法。测定原理基于在硫酸存在下，高锰酸钾将试样中所含的汞氧化为汞（II）离子，用氯化羟胺还原多余的氧化剂，用氯化锡（II）将汞（II）离子还原为汞，在空气或氮气中夹带汞，使气体混合物通过测量池，并在253,7 nm波长下测量吸收。

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.

标准预览图