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以水溶性螯合剂PAR为萃取剂 ,在高聚物吐温 80水溶液中 ,选择 (NH4) 2 SO4作分相盐 ,用EDTA NaOH溶液调节pH值 ,考察了Pd(Ⅱ )、Rh(Ⅲ )、Pt(Ⅳ )的液 固萃取行为 ,确定了吐温 80 (NH4) 2 SO4 PAR体系中Pd(Ⅱ )与Rh(Ⅲ )、Pt(Ⅳ )的分离条件 ,同时建立了Pd(Ⅱ )的测定方法。Pd(Ⅱ ) PAR配合物表观摩尔吸光系数为 4 .2 3× 10 4L·mol-1·cm-1,钯量在 0～ 2 3.2 0 μg/ 10 .0 0ml范围内符合比耳定律 ,检出限为 0 .0 2 6 μg/ 10 .0 0ml。方法选择性好 ,易与钯共存的常见阴、阳离子不干扰测定 ;用拟定方法分离测定合成样和实际样 ,结果满意。
The water-soluble chelating agent PAR was used as extracting agent. In the polymer Tween 80 aqueous solution, (NH4) 2SO4 was selected as the salt for phase separation and the pH was adjusted with EDTA NaOH solution. The effects of Pd (Ⅱ), Rh (Ⅲ) (Ⅱ) with Rh (Ⅲ) and Pt (Ⅳ) in Tween 80 (NH4) 2 SO4 PAR system were determined by the liquid-solid extraction of Pt (Ⅳ) test methods. The apparent molar absorptivity of Pd (Ⅱ) PAR complex was 4.23 × 104 L · mol-1 · cm-1. Beer’s law was obeyed in the range of 0-2.2 0 μg / The detection limit was 0.026 μg / 10 .0 ml. The selectivity of the method is good, and the common anion and cation that coexist with palladium do not interfere with the determination. The synthetic sample and the actual sample are separated and determined by the method of determination, and the results are satisfactory.