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机构地区:[1]云南大学化学系
出 处:《分析试验室》2008年第2期58-61,共4页Chinese Journal of Analysis Laboratory
基 金:云南省自然科学基金重点(2005E0003Z);云南省教育厅科学研究基金(5Z0103A)项目资助
摘 要:根据新试剂1-(2′-苯并噻唑)-3-(4′-羧基苯)三氮烯(BTCBT)与钯的显色反应及C8固相萃取小柱对显色络舍物的固相萃取,建立了一种测定痕量钯的新方法,在pH为5.0~6.3的柠檬酸氢二钠-NaOH缓冲介质中,在乳化剂OP和SDBS存在下,钯与BTCBT发生反应形成1:2的稳定络合物,该络合物可用C8固相萃取小柱富集,小柱上富集的络舍物用乙醇洗脱后用分光光度法测定.在富集后的测定液中,络合物最大吸收波长为490nm,摩尔吸光系数ε=1.16×10^5L·mol^-1·cm^-1,pd^2+量在0.1~1.2μg/mL内符合比尔定律,方法适用于测定催化剂中的钯。Based on the color reaction of 1-(2′-benzothiazole)-3-(4′-carboxylbenzene) triazene(BTCBT) with palladi- ran( 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 ε is 1.16 × 10^5 L·mol^-1·cm^-1 . The method was applied to determination of the trace palladium in the C-Pd catalysts with a satisfactory result.
关 键 词:1-(2′-苯并噻唑)-3-(4′-羧基苯)三氮烯 固相萃取 Pd
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