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测定微量铀(Ⅵ)较常用的是偶氮胂Ⅲ法。该法选择性不高,需要萃取分离,手续较为麻烦。此外也有用偶氮氯膦Ⅲ测定微量铀(Ⅵ)的方法。当试剂在PH～1发色时,灵敏度虽然比偶氮胂Ⅲ高,但干扰元素仍然很多,而且钙离子干扰很严重。资料曾研究该试剂在3NHCI介质中与UO_2~(2+)发色的条件,但在该条件下有沉淀形成,需加大量的异丙醇(33％)以避免沉淀的产生。我们模拟萃取法将试剂进一步提纯,并使其在3NHNO_3介质中(用尿素处理)
Determination of trace uranium (Ⅵ) is more commonly used arsenazo Ⅲ method. The selectivity of the law is not high, the need for extraction and separation, procedures more trouble. There are also methods for the determination of trace amounts of uranium (Ⅵ) with chlorophosphonazo III. When the reagent in the PH ~ 1 hair color, although the sensitivity of arsenazo III sensitivity, but the interference is still a lot of elements, and calcium interference is very serious. Materials The reagent was studied for the color development of the reagent with UO 2 2+ in 3N HCI medium. However, under this condition, a precipitate formed and a large amount of isopropanol (33%) was required to prevent the precipitation. We simulated the extraction method to further purify the reagents, and make it in 3NHNO_3 medium (treated with urea)