偶氮氯膦6,8-萘二磺酸-氯化+四烷基吡啶光度法测定矿石中的铀
SPECTROPHOTOMETRIC DETERMINATION OF URANIUM IN ORE WITH A NEW TYPE THORON AND TPC
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摘要: 铀(IV)在 0.5—1.4 mol/l盐酸中,用氯化十四烷基吡啶(简称 TPC)作增溶剂,铀(IV)与偶氮氯膦6,8-萘二磺酸(简称偶氮氯膦G)-TPC形成的三元络合物具有极高的灵敏度(ε_(705nm)=1.6×10~5l·mol~(-1)·cm~(-1)和较好的选择性。从而建立了用P_(350)-DA_(201)树脂柱层析分离,在pH1.6—4.5的铁(II)-EDTA体系中还原铀(VI),以偶氮氯磷6,8一萘二磺酸显色,TPC增溶光度法测定矿石中的铀。当矿样中铀量为5×10~(-4)％时,相对标准偏差为±11.4％。Abstract: Uranium in the ore is separated and converted into U(IV) in HCl andcomplexed with TPC (tetradecyl pyridine chloride) and a new type thoron reagent,2(phosphino-chloro-benzenediazo)-7 (disulfo-naphthyl-diazo)-naphthalene-1, 8 diol-3, 6 disulfonic acid. The molar absorbance at 705 nm is 1.6×10~5, higher thanthat with arsenazo III as the color developing reagent. The relative standarddeviation is±11.4% for ores containing 0.0005% U.
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