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本文介绍了测定天然水样品中铀和钍的一种方法。水样用柠檬酸酸化、过滤,然后加入柠檬酸钠和抗坏血酸。得到的 pH3的溶液通过装有4克道埃克斯1×8树脂(柠檬酸盐型)的柱,这时铀和钍都以柠檬酸盐络阴离子的形式被吸附。钍用8MHCl 淋洗,淋洗液在8MHNO_3介质中通过另一个装有2克同一种树脂(硝酸盐型)的柱进行阴离子交换,使钍与其共淋洗出的物质分离。用 IBMK、丙酮和1MHCI 组成的混合物(体积比1:8:1)洗柱以完全除去铁。此后用6MHCl 处理树脂。而铀则是用1MHCl 从装有4克树脂的柱中淋洗出来。淋洗液中的钍用分光光度法(铀试剂Ⅲ法)测定;铀则用荧光法分析。上述的分析规程已用于测定在奥地利收集的大批水样,包括矿泉水中的铀和钍。测定结果表明,水中铀和钍的含量之间存在着一个简单的关系,这就有可能在样品铀浓度的基础上近似地计算出钍的含量,反之亦然。
This article describes a method for determining uranium and thorium in natural water samples. The water sample is acidified with citric acid, filtered, and sodium citrate and ascorbic acid are added. The resulting solution of pH 3 was passed through a column containing 4 grams of Acux 1x8 resin (citrate type), at which point both uranium and thorium were adsorbed as citrate complex anions. Thorium was rinsed with 8M HCl and the eluent was anion exchanged in 8M HNO 3 media through another column containing 2 grams of the same resin (nitrate type), separating thorium from its co-eluted species. The column was washed with a mixture of IBMK, acetone and 1 M HCl (1: 8: 1 by volume) to completely remove the iron. The resin was then treated with 6M HCl. Uranium, on the other hand, was rinsed with 1M HCl from a column containing 4 grams of resin. Eluent in thorium spectrophotometry (uranium reagent Ⅲ method) determination; uranium is the use of fluorescence analysis. The above analytical protocol has been used to determine the bulk of the water samples collected in Austria, including uranium and thorium in mineral water. The results show that there is a simple relationship between the amounts of uranium and thorium in the water, which makes it possible to approximately calculate the thorium content on the basis of the uranium concentration of the sample and vice versa.