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本实验采用萃取色层分离技术测定水及食品中天然钍,用聚三氟氯乙烯粉作支持剂,固定相为50%的N~(235)——二甲苯溶液(Ⅴ/Ⅴ)。食品灰样或天然水经预处理后,制成约2N的硝酸体系溶液,在盐析剂硝酸铝存在下,通过色层柱,钍被吸附而与杂质分离,然后用8N盐酸淋洗,收集第3～11毫升淋洗液,以偶氮胂Ⅲ比色测定。
In this experiment, the extraction of natural thorium in water and foodstuffs was determined by the method of extraction and color separation. Poly (chlorotrifluoroethylene) powder was used as support agent, and the stationary phase was N ~ (235) -xylene solution (V / V) Food gray sample or natural water after pretreatment, made of about 2N nitric acid solution, in the presence of salting-out agent aluminum nitrate, through the chromatography column, thorium is adsorbed and impurities separated, and then rinsed with 8N hydrochloric acid, collected The third to 11 ml eluent was measured with arsenazo III colorimetric assay.