PAN-6S作络合滴定指示剂连续测定铜和镍的研究

1-(2-Pyridylazo)-2-naphthol-6-sulphonic Acid as Complexmetric Titration Indicator for Continuous Determination of Copper and Nickel

就PAN 6S试剂作络合滴定指示剂连续测定铜和镍进行研究.在pH为2.3的氨基乙酸 盐酸溶液中,以PAN 6S作指示剂,以EDTA为滴定剂连续滴定测定镍和铜,其终点颜色变化敏锐,准确度高,铜、镍比例在1∶20～20∶1范围之间相互无影响.方法用于合金中铜、镍的连续测定,结果满意.

In this paper, a efficacious method for the continuous titration determination of copper and nickel by 1-(2-pyridylazo)-2-naphthol-6-sulphonic acid as the complexmetry indicator is studied in the medium of glycine-hydrochloric acid at pH 2.3.The end point for both copper and nickel are sharp. The amounts of copper and nickel do not interfere each other in the suitable concentration range. The method has been for the determination of copper and nickel in alloys with satisfactory results.