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前言 纯碱厂精制盐水中含有近饱和的NaCl,而含钙、镁甚微。若以钙指示剂、铬黑T作指示剂,用EDTA分别直接测定钙和镁,无明显的滴定终点。采用离子交换树脂分离干扰离子后再行测定钙和镁,则手续繁杂。如将试样稀释5倍以上,使取样量受限制,误差也较大。因而到目前为止,国内各纯碱厂还没有一个快速准确测定精制盐水中钙和镁的方法。 我们在生产实践中发现,采用K-B混合指示剂,以EDTA直接测定精制盐水中的钙和镁,
Preface soda plant refined brine contains nearly saturated NaCl, and calcium, magnesium is very small. If the calcium indicator, chrome black T as an indicator, respectively, with direct determination of calcium and magnesium EDTA, no obvious titration end point. The use of ion exchange resin separation of ions after the determination of calcium and magnesium, the procedure complicated. If the sample diluted more than 5 times, so that the sample size is limited, the error is larger. So far, each soda plant in China does not have a quick and accurate method for the determination of calcium and magnesium in refined brine. We found in the production practice, the use of K-B mixed indicator, EDTA direct determination of refined brine and calcium,