非离子表面活性剂Triton X—100存在下铜试剂光度法同时测定微量铜和镍

SIMULTANEOUS DETERMINATION OF COPPER AND NICKEL WITH DDTC SPECTROPHOTOMETRY IN THE PRESENCE OF TRITON X-100

研究了非离子表面活性剂Ｔｒｉｔｏｎ Ｘ—１００ 存在下，铜试剂光度法同时测定微量铜和镍的新方法。结果表明，ｐＨ＝８ ．５０ 的氨性介质中，铜、镍与铜试剂生成有色配合物，λＣｕｍａｘ ＝ ４２０ｎｍ ，λＮｉｍａｘ ＝ ３３０ｎｍ ，∑Ｃｕ４２０ ＝ １．１ ×１０４Ｌ·ｍｏｌ－ １·ｃｍ － １ ，∑Ｎｉ３３０ ＝ ２ ．５×１０４Ｌ·ｍｏｌ－１·ｃｍ －１ ；铜量在０ ～４．４ｍｇ·Ｌ－ １ 、镍量在０ ～１ ．８ｍｇ·Ｌ－１ 范围内符合比耳定律。此法用于钢样中微量铜、镍的测定，结果令人满意。

A new simultaneous method for determination of copper and nickel with DDTC spectrophotometry in the presence of Triton X-100 was studied. The results showed that in pH=8.50 ammoniacal medium,copper and nickel can form colored complexes with DDTC.λ cu max =420nm,420nm,λ Ni max =330nm;∑ Cu 420 =1.1×10 4L·cm 1,∑ Ni 330 =2.5×10 4L·mol -1 ·cm 1;Beeris law was obeyed for the concentration of copper in the range of 0～4.4mg·L -1 and 0～1.8mg·L -1 of nickel.The method had been applied to deter mination of trace copper and nickcl in steel sumples and the results were salisfactory.