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用约翰逊和弗洛伦斯提出的分光光度方法,测定了矿石、残渣和其他材料中的铀。这种方法使用非常灵敏的显色试剂2-(5—溴—2—吡啶基偶氮)—5—二乙胺苯酚,即溴—PADAP,它与铀在 pH7.6时形成红色的络合物,λ_(max)=578nm。在含 CyDTA(1,2—环己烷二氨基四乙酸)、磺基水杨酸、氟化钠的络合剂溶液存在时,只有 Cr~(3+)、V~(+5)和磷酸根产生严重的干扰。用三正辛基膦氧(TOPO)—环己烷溶液萃取铀,就使这种方法成为分析铀的特效方法。用这种方法分析了各种含铀材料中的铀,在本文公布出这些分析结果,并与萤光法、X 射线萤光法、容量法的分析结果作了比较。
The spectrophotometric method proposed by Johnson and Florence was used to determine uranium in ores, residues and other materials. This method uses the very sensitive chromogenic reagent 2- (5-bromo-2-pyridylazo) -5-diethylamineamine, bromine-PADAP, which forms a red complex with uranium at pH 7.6 Λ max (max) = 578 nm. In the presence of a complexing agent solution containing CyDTA (1,2-cyclohexanediaminotetracetic acid), sulfosalicylic acid and sodium fluoride, only Cr 3+, V 5+ and phosphoric acid Roots have serious disturbances. Extracting uranium with a solution of tri-n-octylphosphine oxide (TOPO) -cyclohexane makes this method an effective method of analyzing uranium. Uranium in various uranium-containing materials was analyzed by this method. The results of these analyzes are published in this paper and compared with the results obtained by the fluorescence, X-ray fluorescence and volumetric methods.