电镀液和电镀层中铜和锰的联合测定

Abstract

当PH＝10时，铜和锰都能与PAr生成稳定的红色络合物；当PH＝7时，锰与PAr几乎不络合，而铜与PAr则可以稳定络合.利用这种差异，可以在PH＝10的介质中测定铜和锰的合量，而在PH＝7的介质中测定铜的量，再由两者之差求得锰的含量.试验表明，PH＝10.0时，εCu-PAr498.5＝4.66x104l/MOl·CM；εMn-PAr498.5＝8.00x104l/MOl·CM；PH＝7.0时，εCu-PAr498.5＝4.26x104l/MOl·CM.相对标准偏差小于3%，回收率为95%~101%.其方法适用于电镀液和电镀层中Cu和Mn的测定

Cu 2+ and Mn 2+ can complex with PAR to form stable red compounds at pH = 10.0.At lower pH values, Mn 2+ cann′t complex with PAR ,while Cu PAR is still stable and remains a relatively high absorbance.According to this difference , Cu 2+ and Mn 2+ can be determined at different pH in the aqueous phase by spectrophotometry.The molar absorptivities of the two complexes are found to be 4.66×10 4 L/mol·cm (for Cu 2+ at pH=10.0), 4.26×10 4 L/mol·cm(for Cu 2+ at pH=7.0) and 8.00×10 4 L/mol·cm(for Mn 2+ at pH =10.0) respectively.The relative standard deviations are less than 3 % and the recoveries are 95%～101% .This method is applied to determine the content of Cu and Mn in the electroplating solution and electroplated layer.