【摘要】 <正> 有机显色剂PAR（4-2-吡啶偶氮-间苯二酚）用于光度法测铀,检测限1ppm,用于极谱法测铀尚未见报道。我们发现UO₂²⁺-PAR络合物在溶液pH=8.8～9.8时,于试剂波之后产生清晰的吸附波。在仪器最小倍率下无空白讯号。峰电流（i_p）与铀浓度在0.08～2.40μg/ml间呈线性关系、引入氟离子和二苯胍时i_p增加、波形改善（与试剂峰分离更远）。本体系对与铀常伴生的钍、稀土元素有较好的抗干扰性。采用TBP反相色层法容易分离铁、铜、钴、镍、钒、铬和钛等严重干扰的元素,使本法具备良好的适用性。对于含铀0.0005％以上的矿石分析,相对标准偏差小于±10％。更多还原

【Abstract】 A new system for determination of U was advanced.In the system complex UO₂²⁺-PAR [pyridine（2-azo-4） resorcinol] Froduced an absorptive wave of which peak potential was at -0.606V（vs. SCE） at pH 8.8 to 9.8. The peak current was directly proportional to the concentration of U in the range 0.08 to 2.40μg/ml. Polarographic behaviour of the wave was preliminarily discussed. The system was applied to the determination of trace U in reference sample of rocks and good results were gained.更多还原