TritonX-100-5-Br-PADAP光度法测定铜和镍  

Spectrophotometric Determination of Copper and Nickel in Steel Samples with 5 Br PADAP in Presence of Triton X 100

作　　者：萨木嘎[1] 刘颖[2] 嘎日迪[2] 

机构地区：[1]内蒙古农牧学院基础部,呼和浩特010018 [2]内蒙古师范大学化学系,呼和浩特010022

出　　处：《岩矿测试》1999年第4期291-294,共4页Rock and Mineral Analysis

基　　金：内蒙古自然科学基金

摘　　要：研究了非离子型表面活性剂Ｔｒｉｔｏｎ Ｘ－ １００ 存在下，用５ － Ｂｒ － ＰＡＤＡＰ 光度法测定铜、镍的方法。结果表明：在ｐＨ９ ．０ 的硼砂缓冲介质中，５ － Ｂｒ － ＰＡＤＡＰ 与铜和镍生成紫红色络合物，λＣｕｍ ａｘ ＝ ５７５ ｎｍ ，εＣｕ ＝ １ ．０４ ×１０５ Ｌ·ｍｏｌ－ １·ｃｍ － １ ；λＮｉｍ ａｘ ＝ ５７５ ｎｍ ，εＮｉ ＝ １ ．１４ ×１０５ Ｌ·ｍｏｌ－ １·ｃｍ － １ 。铜和镍的质量浓度分别在０ ～５６０ μｇ／ Ｌ和０ ～４４０ μｇ／ Ｌ符合比尔定律。加入六偏磷酸钠后，由于偏磷酸镍的形成，镍不再与５ － Ｂｒ － ＰＡＤＡＰ 显色，可通过铜及铜镍总量的测定，计算出镍的含量。用该方法实测了钢样中铜和镍的含量，结果与推荐值相符，对铜和镍５ 次测定的ＲＳＤ均小于５ ％ 。A method for spectrophotometric determination of copper and nickel in presence of Triton X 100 was developed. In borax buffer medium at pH 9.0, copper and nickel react with 5 Br PADAP and form a purplish red complex with λ Cu max =575 nm, ε Cu =1.04×10 5 L·mol -1 ·cm -1 and λ Ni max =575 nm, ε Ni = 1.14 ×10 5 L·mol -1 ·cm -1 . Beers law is obeyed in the concentration ranges of 0～560 μg/L for copper and 0～440 μg/L for nickel. Based on the evidence of the suppression effect of nickel metaphosphate on color reaction of Ni with 5 Br PADAP, the analytical result for Ni can be obtained indirectly by subtraction of Cu from sum of Cu and Ni determined by this method after the addition of sodium hexametaphosphate to the sample solution. The method has been applied to the determination of Cu and Ni in standard steel sample. The results are in agreement with recommended values with precision of <5% RSD( n =5).

关 键 词：铜 镍 二乙氨基苯酚 分光光度法 

分 类 号：O614.121[理学—无机化学] O614.813[理学—化学]