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三正辛胺(TOA)是铀的良好萃取剂,但在分析中应用很少,主要的原因是用0.3mol/L HCl两次反萃取铀的回收率仅为92％,因此很少用于样品分析。本文作者用0.2mol/L硝酸一次反萃取铀的回收率可达100％,测定结果稳定。该分离方法和Br-PADAP测定方法结合,成功地用于铀矿石中铀的测定,方法的精密度和准确度都较好。(一)主要仪器和试剂1.721型分光光度计(上海第三分析仪器厂);2.PHS-3型酸度计(上海第二分析仪器厂);3.4％TOA(进口分装)-二甲苯溶液;
Tri-n-octylamine (TOA) is a good uranium extractant, but it is rarely used in the analysis. The main reason for this is that the recovery of uranium by twice stripping with 0.3 mol / L HCl is only 92% and is rarely used Sample analysis. The authors use 0.2mol / L nitric acid once stripping uranium recovery rate of up to 100%, the measured results were stable. The separation method combined with the Br-PADAP determination method has been successfully applied to the determination of uranium in uranium ores. The precision and accuracy of the method are good. (A) of the main instruments and reagents 1.721 spectrophotometer (Shanghai Third Analytical Instrument Factory); 2. PHS-3 pH meter (Shanghai Second Analytical Instrument Factory); 3.4% TOA ;