N510与D2EHDTPA对钯的协同萃取

SYNERGISTIC EXTRACTION OF PALLADIUM(Ⅱ) WITH N510 AND D2EHDTPA

用 2 -羟基 -5 -仲辛基 -二苯甲酮肟 (N5 1 0 )与二 -(2 -乙基己基 )二硫代磷酸 (D2 EHDTPA)的氯仿溶液 ,从高氯酸介质中对钯的协同萃取进行了研究。采用斜率法确定了萃合物的组成为 :L· Pd· A,协萃反应平衡常数为 lg K1 2 =1 .67,协同萃取配合物生成常数为 β1 2 =3 .3 0。同时计算了协同萃取反应的热力学函数值。

The synergistic extraction of Pd(Ⅱ) from perchloric acid system with 2 hydroxyl 5 sec n octyl diphenyloxime(N510) and di (2 ethylhexyl)phosphorodithioic acid(D2EHDTPA) has been investigated.By the method of slope analysis,the composition of the synergistic extracting complexes have been determined to be L·Pd·A.The mechanism of the synergistic extraction of Pd(Ⅱ) has been proposed as follows: Pd 2+ (A) +H 2A (O) +HL (O) K 12 L·Pd·A (O) +3H + (A) Moreover,the equilibrium constants and the thermodynamic functions of the synergistic reactions have been calculated.