ISO 1691:1976 工业用硅酸钠和硅酸钾.碳酸盐含量的测定.气体容积法

标准编号：ISO 1691:1976

中文名称：工业用硅酸钠和硅酸钾.碳酸盐含量的测定.气体容积法

英文名称：Sodium and potassium silicates for industrial use — Determination of carbonates content — Gas-volumetric method

发布日期：1976-07

标准范围

根据初步试验，设想了三种情况:既不含硫化物也不含氯酸盐的硅酸盐；含硫化物的硅酸盐；含有氯酸盐的硅酸盐。该方法基于在蒸汽中煮沸含有甲基橙和铅纸带的酸化试验部分。硫化物的存在使纸张变黑，氯酸盐的存在使甲基橙脱色。体积法*通过与盐酸溶液反应，测量从既不含硫化物也不含氯酸盐的硅酸盐中析出的二氧化碳。规定了硫化物氧化和氯酸盐还原的原理。

Three cases, defined by a preliminary test, are envisaged: silicates containing neither sulphides nor chlorates; silicates containing sulphides; silicates containing chlorates. The method based on boiling of an acidified test portion containing methyl orange and with a lead paper strip in the vapour. The presence of sulphides produces blackening of the paper and the presence of chlorates decolorizes the methyl orange. Volumetric*measurement of carbon dioxide evolved from silicates containing neither sulphides nor chlorates by reaction with a hydrochloric acid solution. The principle for the oxidation of sulphides and the reduction of chlorates are specified.

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