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锆-4合金作为反应堆结构材料和核燃料元件的包壳,由于它所含稀土的热中子俘获截面较大,所以锆-4中稀土的分析分离很重要。 为了提高分析分离的灵敏度,对二步萃取法作了些改进:第一步改用磷酸二2-乙基已基酯(D_2EHPA)为萃取剂,选用4N HCl介质能萃取大量锆,把稀土分离出来。第二步用磺基水杨酸-硫氰酸铵作掩蔽剂,1苯基3甲基4苯甲酰基吡唑啉酮(PMBP)萃取稀土,将其它非稀土元素分离掉,然后用pH2.5HCl进行反萃取,偶氮胂Ⅲ紫色分光光度计测定稀土,灵敏度能达0.29ppm。实验结果如下:
Zirconium-4 alloy as reactor structural materials and nuclear fuel cladding components, because it contains rare earth thermal neutron capture cross section is larger, so rare earth zirconium-4 analysis separation is very important. In order to improve the sensitivity of the analytical separation, the two-step extraction method was improved: the first step is to use di-2-ethylhexyl phosphate (D 2 EHPA) as the extractant, 4N HCI medium can extract a large amount of zirconium to separate the rare earth come out. The second step sulfosalicylic acid - ammonium thiocyanate as a masking agent, 1 phenyl 3 methyl 4 benzoyl pyrazolone (PMBP) extraction rare earth, the other non-rare earth elements were separated, and then with pH2. 5HCl back extraction, arsenazo Ⅲ purple spectrophotometer rare earth determination, the sensitivity can reach 0.29ppm. The experimental results are as follows: