5-Cl-PADAB作为铜的络合滴定指示剂的研究

Study of 4-[(5-Chloro-2-Pyridyl) azo]-1,3-Diamino-Benzene (5-Cl-PADAB) as Metallochromic Indicator for Copper

本文以5-Cl-PADAB作为络合滴定指示剂测定铜,它具有灵敏度高,敏锐性好和终点误差小的优点,所用酸度以pH5较佳,已应用于锡青铜中锡和铜及铝青铜中铝和铜的测定。

The Properties of 5-Cl-PADAB as a metallochromic indicator in complexometric titration for copper have been thoroughly investigated. The indicator can be used at pH 3.5～6 (preferable at pH 5). The colour change of the end point was very sharp and the error of the end point was very small. The indicator has been successfully used for the determination of Sn and Cu in tin bronze and of Al and Cu in aluminium bronze.