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以氟化物、六偏磷酸盐解蔽络合滴定法测定铝,锡是主要的干扰元素。为了消除锡的干扰,一般采用氯化铵高温挥发锡、苯甲酸铵沉淀分离铝、继之又在过氯酸介质中溴氢酸挥发锡以及铜试剂沉淀分离锡等繁长的分离手续。笔者在进行锡合金中锡的络合滴定法测定试验时,发现用邻苯三酚为解蔽剂,大量铝的存在不干扰锡的测定。利用这一性质,在络合滴定法测铝时,籍邻苯三酚掩蔽锡而消除其干扰。
With fluoride, hexametaphosphate unmasking complexometric titration determination of aluminum, tin is the main interference element. In order to eliminate the interference of tin, the general use of ammonium chloride high temperature volatile tin, ammonium benzoate precipitation separation of aluminum, followed by perchloric acid in the medium and brominated hydrogen acid volatile tin precipitation and separation of copper reagents, and other long separation procedures. The author in the determination of tin tin complexometric titration test, found that pyrogallol as a shellac agent, the presence of a large number of aluminum does not interfere with the determination of tin. Utilizing this property, pyrogallol masks tin and eliminates its interference when complexometric titration of aluminum is performed.