本文提供了一个直接测定矿石中铀(Ⅵ)的简单、快速、选择性较好的方法。该法在磷酸体系中,pH值6.5时,铀(Ⅵ)与2-(2-噻唑偶氮)-5-磺甲胺基苯酚(TASMAP)和溴化十六烷基三甲基铵形成三元络合物。其最大吸收在570纳米处,摩尔吸光系数约为3×10~4升·摩尔~(-1)·厘米~(-1)。几乎所有常见离子都能被EDTA和氟化钠所掩蔽。溶液中铀量为10～60微克/50毫升时遵守比尔定律,相对标准偏差小于±5％。 This article provides a simple, rapid, and selective method for the direct determination of uranium (Ⅵ) in ores. In this method, uranium (Ⅵ) forms with tris (2- (2-thiazolylazo) -5-sulfomethylaminophenol (TASMAP) and cetyltrimethylammonium bromide Element complex. The maximum absorption is at 570 nm, and the molar absorption coefficient is about 3 × 10 -4 mol · cm -1. Almost all common ions can be masked by EDTA and sodium fluoride. Beer’s law is obeyed when the amount of uranium in the solution is 10-60 μg / 50 ml with a relative standard deviation less than ± 5%.