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在络合滴定中,国内许多单位多年来一直使用氰化钾作掩蔽剂,因氰化钾剧毒,长期使用很不安全.许多分析工作者也曾寻找过多种掩蔽剂来代替氰化钾,但都没有得到满意的结果.根据文献关于丙酮氰醇(文中用[Ⅰ]代表丙酮氰醇)在络合滴定中作掩蔽剂的介绍,本文对[Ⅰ]的掩蔽条件和用量进行试验.实验证明在氨性溶液中,0.5毫升[Ⅰ],可以完全掩蔽50毫克的镍、铜、锌.对一些用氰化钾作掩蔽剂的分析方法,用[Ⅰ]代替
In the complexation titration, many domestic units have been using potassium cyanide as a screening agent for many years, because of the toxicity of cyanide potassium, long-term use is not safe.Many analysts have also sought a variety of masking agents to replace potassium cyanide , But no satisfactory results have been obtained.Based on the literature introduction of acetone cyanohydrin ([I] in this paper for acetone cyanohydrin) as a masking agent in complexometric titration, the masking conditions and the amount of [I] were tested in this paper. It has been experimentally demonstrated that 0.5 ml of [I] in an ammoniacal solution completely masks 50 mg of nickel, copper, and zinc.For some analytical methods using potassium cyanide as a masking agent, [I] is used instead of