2-(1,3,4-三氮唑偶氮)-5-二乙氨基苯胺作为络合滴定铜的指示剂的研究

Studies on 2-(1,3,4-triazolylazo)-5-diethyla mina Aniline as Indicator for Copper in Complexometric Titration

研究了新试剂2-(1,3,4-三氮唑偶氮)-5-二乙氨基苯胺(TZAN)作为络合滴定铜的指示剂的分析性能。结果表明,在PH值为4.0-7.5范围内,加入6滴指示剂TZAN,用EDTA标准溶液进行滴定,滴定终点由红色变为亮绿色,变色敏锐,准确度高,具有一定的实用价值。方法用于实际样品分析,结果满意。

In the paper, we have studied 2 - （ 1,3,4 - triazolylazo） - 5 - diethyla mina Aniline as indicator for copper in complexometric titration. The result indicates, in the buffer solution of pH4.0 result 7.0, adding 6 drops of indicator, and using the complexing titration with the standard solution of EDTA, terminal point turns from red into bright green. It is sharp to change color. The method with high accuracy and certain practical value is used in the real sample analysis, the result is satisfactory.