利用SBDR固相萃取富集分离和分光光度法测定氰化渣中Pd的研究

Study on Solid Phase Extraction and Spectrophotometric Determination of Palladium in Cyanide Residue with p-Sulfobenzylidene-rhodanine

研究了对磺酸基苯亚甲基若丹宁(SBDR)与Pd的显色反应及C18固相萃取小柱对显色络合物的固相萃取,并结合微波消化样品,提出了一种测定氰化渣中痕量Pd的方法,在pH=2.0的氯乙酸-氢氧化钠缓冲介质中,溴化十六烷基三甲胺(CTMAB)存在下,SBDR与Pd反应生成21稳定络合物,λmax=535nm,ε=7.79×104L·mol-1·cm-1。Pd含量在0.01～2.0μg/mL内符合比尔定律,方法用于氰化渣中痕量Pd的测定,结果令人满意。

Based on the color reaction of p-sulfobenzylidene-rhodanine (SBDR) with palladium (II) and the solid phase extraction of its colored complex with C18 cartridge, a new method for the determination of palladium in cyanide residue was studied. In pH 2.0 buffer solution medium and in the presence of CTMAB, SBDR can react with palladium to form a stable 2:1 complex. The molar absorptivity is 7.79×104 L·mol-1·cm-1 at 535 nm. Beer’s law is obeyed in the range of 0.01～2.0 μg/mL. The method was applied to the determination of palladium in cyanide residue with good results.