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我国工业丙酮常用NH_2OH·HCl肟化法测定含量,这个方法不仅手续繁琐,而且精密度差、终点不明显。根据Graven采用Agulhon反应,试液对纯丙酮在常温下需要3小时才反应,但有o.5%的醇存在时,试液中的Cr~(6+)在1～2分钟就发生反应,立即还原出Cr~(3+)的绿色,比较绿色深浅可测出醇含量;同时用卡尔费休法测定样品中的微量水,则丙酮含量%=100-(醇+水)%。
China industrial acetone commonly used NH_2OH · HCl oximation method for the determination of content, this method is not only cumbersome procedures, and poor precision, the end is not obvious. According to Graven’s Agulhon reaction, the test solution requires only 3 hours for pure acetone to react at normal temperature. However, when 0.5% alcohol is present, Cr 6+ in the test solution reacts in 1 to 2 minutes, The Cr (3+) green color was immediately reduced and the green content was measured to determine the alcohol content. At the same time, the Karl Fischer method was used to determine the trace amount of water in the sample. The acetone content% = 100- (alcohol + water)%.