1,5-二(2-羟基-5-氯苯)-3-氰基甲光度法同时测定铝合金中微量锌和铜

Spectrophotometric simultaneous determination of trace zinc and copper in aluminium alloys with 1,5-di(2-hydroxy-5-chlorophenyl)-3-cyanoformazane

研究了显色剂 1,5 二 (2 羟基 5 氯苯 ) 3 氰基甲 (HCPCF)分光光度同时测定锌和铜的新方法。有TritonX -10 0存在下 ,分别在pH 9 5氨水 -氯化铵和pH 3 6乙酸 -乙酸钠介质中 ,HCPCF与锌和铜分别形成稳定的 1:1蓝色络合物 ,最大吸收波长分别为 64 5nm和 62 0nm ,表观摩尔吸光系数分别为 3 0× 10 4 和 3 2× 10 4 ,在 2 5mL溶液中锌和铜的质量在 0～3 0 μg范围内与吸光度的关系均符合比尔定律。将该法应用于铝合金中微量锌和铜的测定 ,结果满意。

A spectrophotometric method for simultaneous determination of trace zinc and copper with 1,5-di(2-hydroxy-5-chlorophenyl)-3-cyanoformazane(HCPCF) was studied.In the medium of NH_3·H_2O-NH_4Cl(pH9.5) and NaAc-HAc (pH3.6),zinc and copper respectively formed 1:1 blue complexes with HCPCF in the presence of TritonX-100,which had maximum absorbance at 645nm (Zn) and 620nm(Cu).The apparent molar absorptivity was 3.0×10~4L·mol^(-1)·cm^(-1)(Zn) and 3.2×10~4L·mol^(-1)·cm^(-1)(Cu), respectively.Beer's law is obeyed for both of zinc and copper in the range of 0-30μg/25mL.The presented method has been used to determine trace zinc and copper in aluminium alloys with satisfactory results.