p-MBPMP对铀(Ⅵ)、镧(Ⅲ)、铈(Ⅲ)萃取性能研究

Study on the Extraction of U(Ⅵ ), La(Ⅲ), Ce(Ⅲ) with p-MBPMP

测定了新试剂p-MBPMP在醇-水溶剂中的酸离解常数pK_a值.用斜率分析法研究了其对铀(Ⅵ)、镧(Ⅲ)、铈(Ⅲ)的萃取机理、分别求出了其萃合物组成、pH1/2和萃取平衡常数logK_(ex)值,并计算了镧(Ⅲ)铈(Ⅲ)间的分离系数.实验证明,p-MBPMP是较PMBP对铀(Ⅵ)更为优良的试剂.

The negative value of logarithm of the acid dissociation constant pKa of the new agent p-MBPMP were determined in ethanol-water by pH-potentiometric titration. The extration mechanisms of U(Ⅵ)、 La(Ⅲ) and Ce(Ⅲ) with the new agent were investigated by the slop analysis method. The composition of complexes, pH1/2 and logKex values were obtained respectively and the separation factors between La(Ⅲ) and Ce(Ⅲ) were calculated. The experiments have proved that p-MBPMP is a better on extraction to U(Ⅵ) than that of PMBP.