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本文描述一种高度准确地测定标准参考物质中痕量铀的方法。采用阴离子交换色谱法使铀与各种主体元素分离。大多数元素以6M盐酸淋洗,而Fe(Ⅲ)则以在90％丙酮中的0.5M盐酸淋洗。在用0.1M盐酸淋洗铀后,其它残留的痕量元素,则采用高选择性的阳离子交换法在3克树脂的交换柱中分离。最后六价铀以氯磷偶氮Ⅲ络合物的形式在672毫微米处及DTPA存在下用分光光度法测定(PH1.1±0.2)。即使在半控制分析的操作条件下,其测定结果也十分精确。文章提供了有关的淋洗曲线以及对十种南非UREM标准物质的回收试验和分析结果。
This article describes a highly accurate method for the determination of trace uranium in standard reference materials. Anion exchange chromatography is used to separate uranium from various host elements. Most of the elements are rinsed with 6M hydrochloric acid while Fe (III) is rinsed with 0.5M hydrochloric acid in 90% acetone. After rinsing the uranium with 0.1 M hydrochloric acid, the remaining trace elements were separated using a highly selective cation exchange method in a 3 g resin exchange column. The final hexavalent uranium was determined spectrophotometrically (pH 1.1 ± 0.2) in the form of the chlorophosphorus azo complex III at 672 nm and in the presence of DTPA. Even in the semi-controlled analysis of the operating conditions, the measurement results are very accurate. The article provides relevant leaching curves and results of the recovery testing and analysis of ten South African UREM reference materials.