Hung S C, Qu C L, Wu S S
Institute of Environmental Chemistry, Academia Sinica, P.O. Box 934, Peking, China.
Talanta. 1982 Jul;29(7):629-31. doi: 10.1016/0039-9140(82)80015-5.
A highly sensitive method for spectrophotometric determination of uranium has been devised. The method is based on formation of a red-violet 1:2 (metal:ligand) complex from the reaction of uranium(VI) with 2-(3,5-dibromo-2-pyridylazo)-5-diethylaminophenol (3,5-diBr-PADAP) in the presence of an anionic surfactant, sodium lauryl sulphate. Its molar absorptivity is found to be 9.1 x 10(4)l.mole(-1).cm(-1). The absorbance is constant in the range pH 8.4-9.9 Beer's law is obeyed for 0-1.4 mug/ml concentrations of uranium. In the presence of DCTA the method is selective for uranium, and can be used for the determination of trace amounts of uranium in water samples.
已设计出一种用于分光光度法测定铀的高灵敏度方法。该方法基于在阴离子表面活性剂十二烷基硫酸钠存在下，铀（VI）与2-（3,5-二溴-2-吡啶偶氮）-5-二乙氨基苯酚（3,5-二溴-PADAP）反应形成红紫色1:2（金属：配体）络合物。发现其摩尔吸光率为9.1×10⁴ l·mol⁻¹·cm⁻¹。在pH 8.4 - 9.9范围内吸光度恒定，对于0 - 1.4 μg/ml浓度的铀符合比尔定律。在存在二环己烷二胺四乙酸（DCTA）的情况下，该方法对铀具有选择性，可用于测定水样中的痕量铀。
