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本文报道了用N235-二甲苯-盐酸混合体系,在强酸介质中萃取铀(VI),并用盐酸-氯化钠进行反苹取反应最佳条件。经过铀(VI)的选择性萃取,反萃取与富集,然后用U(VI)-CAS-CTAB多元络合物测定超痕量铀(0.5ppb级以上)。本法最大特点是具有较高的选择性和灵敏度,摩尔吸光系数∑=1.1×10~5,当log(I_o/I_t)=0.001时,其灵敏度为0.002μg/cm~2。此方法用于测定水、废水、土壤和多金属矿中痕量或超痕量铀,操作简便快速,结果十分满意。
In this paper, the optimum conditions of extraction of uranium (VI) in a strong acid medium with an N235-xylene-hydrochloric acid mixed system and the reaction of hydrochloric acid and sodium chloride in an anti-IPT reaction were reported. Uranium (VI) selective extraction, back extraction and enrichment, and then U (VI) -CAS-CTAB multiple complex determination of uranium (0.5ppb level above). The most prominent feature of this method is its high selectivity and sensitivity. The molar extinction coefficient Σ = 1.1 × 10 ~ 5. When the log (I_o / I_t) = 0.001, its sensitivity is 0.002μg / cm ~ 2. This method is used for the determination of trace or ultra-trace levels of uranium in water, wastewater, soil and polymetallic ores, with quick and easy handling and very satisfactory results.