Simultaneous determination of gold and palladium with 5(p-dimethylaminobenzylidene)rhodanine by using the H-point standard addition method in micellar media

The H-point standard addition method (HPSAM), based on spectrophotometric m easurement, for simultaneous determination of A(III) and Pd(II) is describe d. This method is based on the different rate of complex formation of Au(II I) and Pd(II) with 5(p-dimethylaminobenzylidene)rhodanine (PDR) in the pres ence of formate buffer and Brij-35. A study of the rate of complex formatio n in various buffers was carried out and it was found that the HPSAM perfor med well in formate buffer. The results showed that simultaneous determinat ion of Pd and Au could be performed in the range of 0.17-1.8 and 1-3 mug ml (-1) respectively. Selectivity was investigated and the main interferences were eliminated. This method was successfully used for the determination of the analytes in jewelry and synthetic samples. (C) 2001 Elsevier Science B .V. All rights reserved.