Solid phase extraction and spectrophotometric determination of palladium with 1-(2′-benzothiazole)-3-(4′-carboxylbenzene)triazene

Based on the color reaction of 1-(2′-benzothiazole)-3-(4′-carboxylbenzene) triazene(BTCBT) with palladium(Ⅱ) and the solid phase extraction of its colored complex with C8 cartridge,a new method for the determination of palladium was studied.In the presence of OP-SDBS and C3H5(COO)3HNa2-NaOH buffer solution(pH 5.0～6.3) medium.BTCBT reacts with palladium(Ⅱ) to form a stable 2∶1 complex.The colored complex was extracted by C8 cartridge and the retained chelate was a eluted from cartridge with ethanol,then can be determined by spectrophotometry at 490 nm.Beer′s law is obeyed in range of 0.1～1.2 μg/mL and e is 1.16×105 L·mol-1·cm-1.The method was applied to determination of the trace palladium in the C-Pd catalysts with a satisfactory result.