2-(1,3,4-三氮唑偶氮)-5-二乙氨基苯甲酸作为钴的络合滴定指示剂

2-(1,3,4-Triazolylazo)-5-Diethylamino-Benzoicacid as Indicator for Cobalt in Complexometric Titration

研究了 2 - (1,3,4 -三氮唑偶氮 ) - 5 -二乙氨基苯甲酸作为络合滴定钴的指示剂的分析性能。结果表明 ,在 p H值为 6 .0的 HAc- Na Ac缓冲溶液中 ,加入 5滴指示剂 ,用 EDTA溶液滴定至终点溶液由紫红色变为亮橙色 ,终点极为敏锐 ,准确度高 ,结果令人满意。

2-(1,3,4-triazolylazo)-5-diethylamino benzoicacid (TZDBA) as a new indicator for cobalt in complexometric titration was investigated.The result shows that the end point of the titration of cobalt with the reagent is found to be much sensitive in the buffer solution of HAc NaAc(pH6.0) and five drops of TZDBA.The end point occurs when the colour changes from purple red to bright orange ,the end point is sensitived and accurate.The analytical results are satisfactory.