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在pH为 2～ 3的HAc介质中 ,4 - ( 2 -羟基 - 4 -硝基苯偶氮 ) - 1 -苯基 - 3-甲基吡唑啉酮 (HNAPMP)与钍反应生成 2∶1的稳定络合物 ,λmax=540nm ,ε=4 .96× 1 0 4L·moL- 1·cm- 1,Th质量浓度在 0～ 2 .8mg/L内符合比尔定律。方法用于钍钨合金中钍的测定 ,相对标准偏差 (n =5)小于 1 % ,加标回收率为 97%～ 1 0 2 %。
Reaction of 4 - (2 - hydroxy - 4 - nitrophenylazo) -1 - phenyl - 3 - methylpyrazolone (HNAPMP) with thorium in HAc medium with pH 2 ~ 3 yields 2: 1 Λmax = 540nm, ε = 4.96 × 104L · mol-1 · cm-1, and Beer’s law was obeyed at 0-2.8mg / L for Th group. The method was applied to the determination of thorium in thorium-tungsten alloy. The relative standard deviations (n = 5) were less than 1%, and the recoveries were 97% ~ 102%.