SPECTROPHOTOMETRIC DETERMINATION OF URANIUM(VI) WITH 2-(5-BROMO-2-PYRIDYLAZO)-5-DIETHYLAMINOPHENOL
SPECTROPHOTOMETRIC DETERMINATION OF URANIUM(VI) WITH 2-(5-BROMO-2-PYRIDYLAZO)-5-DIETHYLAMINOPHENOL
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DOI：
10.1016/s0003-2670(01)80072-6
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发表时间：
1971-01-01
影响因子：
6.2
通讯作者：
FLORENCE, TM
中科院分区：
文献类型：
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作者：
JOHNSON, DA;FLORENCE, TM
研究了2-(5-溴-2-吡啶偶氮)-5-二乙氨基苯酚(Bromo-PADAP)分光光度测定铀(VI)的新试剂。该试剂对铀高度敏感，铀酰络合物在578 nm处的摩尔吸光系数为74,000，pH为7.6。在混合掩蔽液存在下，只有几个离子严重干扰，通过将铀初步萃取到三正辛基氧化膦中，并在有机相中直接显色，可使该方法专用于铀。详细介绍了水、矿石、磷酸和磷矿、氧化钍和氧化锆中铀的测定方法。
A new reagent, 2-(5-bromo-2-pyridylazo)-5-diethylaminophenol (bromo-PADAP), is described for the spectrophotometric determination of uranium(VI). This reagent is highly sensitive towards uranium, the uranyl complex having a molar absorptivity of 74,000 at 578 nm and pH 7.6. In the presence of a mixed masking solution only a few ions interfere seriously, and the method can be made specific for uranium by a preliminary extraction of uranium into tri-n-octylphosphine oxide, and direct development of the bromo-PADAP colour in the organic phase. Details are given for the determination of uranium in waters, ores, phosphoric acid and phosphate rocks, thorium oxide, and zirconium oxide.