标准摘要
[中文适用范围]： 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。 测定原理是在硫酸存在下，用高锰酸钾将供试品中的汞氧化为汞(II)离子，用氯化羟铵还原过量的氧化剂，将汞(II)离子还原为汞(II)离子。 氯化锡(II)中的汞，将汞夹带在空气或氮气中，使气体混合物通过测量池，并测量253.7 nm波长处的吸收。 [外文原描述]： 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.
英文名称Sodium hydroxide for industrial use — Determination of mercury content — Flameless atomic absorption spectrometric method