γ辐照后30% TRPO-煤油对钚的萃取与保留

Extraction and retention of plutionium with irradiated 30% TRPO-kerosene

研究了 6 0 Co源辐照剂量及辐照前预平衡硝酸浓度对 30 % TRPO-煤油对 Pu的萃取行为的影响。测定了用 0 .6mol/L草酸反萃后有机相中保留的 Pu的百分率。比较了辐照后 30 % TRPO-煤油分离得到的碱萃物、水萃物及中性物3种组分对 Pu的保留情况以及酸性辐解产物二烷基膦酸和一烷基膦酸对 Pu的萃取和保留的影响。结果表明 ,辐照剂量对 Pu分配比影响较大而预平衡酸度的影响较小 ;Pu保留随剂量的增加而增大。辐照后分成的 3种组分中中性聚合物引起的保留最多 ;一烷基膦酸及二烷基膦酸对

Extraction and retention of plutonium with irradiated 30% trialkylphosphine oxide kerosene were investigated. The percentage of plutonium left in the organic phase after back extraction with 0.6 mol/L oxalic acid was determined. The results show that the radiation dose is the primary factor affecting plutonium retention in the organic phase. The plutonium retention is caused by the high boiling point polymeric product obtained from vacuum distillation of irradiated 30% TRPO kerosene after lavation with 5% Na 2CO 3 and deionized water. The phosphonic and phosphinic acids produced by the degradation of TRPO are not the species causing plutonium retention.