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由于~(237)Np含量非常低以及分析的技术困难,有关环境~(237)NP的资料在文献中几乎没有报道。本文讨论了中子活化分析土壤样品中低水平~(237)Np的方法。将2～300克制备好的土壤灰样在迥流烧瓶中用50～80ml浓HCl+浓HNO_3(1:1)浸取两次。样品中加入~(239)Np示踪剂。抽滤浸取液,合并滤液和洗液,滤液中加入盐酸羟胺(0.smol八)和硫酸联胺(0.01mol/L)加热,使Np(Ⅴ)还原为Np(Ⅳ)。用100ml异丙醚震荡萃取两次。水相在电热板上加
Due to the very low content of ~ (237) Np and the technical difficulties of the analysis, information on the environmental ~ (237) NP has hardly been reported in the literature. This article discusses neutron activation analysis of soil samples with low levels of ~ (237) Np. Prepare 2 to 300 g of soiled soil sample in a reflux flask twice with 50 to 80 ml concentrated HCl + concentrated HNO3 (1: 1). The sample was added with ~ (239) Np tracer. The leachate was suction filtered, and the filtrate and washings were combined. The filtrate was heated with hydroxylamine hydrochloride (0.smol 8) and hydrazine sulfate (0.01 mol / L) to reduce Np (V) to Np (IV). Extract twice with 100 ml of isopropyl ether. Add water on the hot plate