二苯基氧膦新衍生物铀酰离子化学传感器研究

Study of PVC Membrane Uranyl Chemical Sensors Based on New Diphenylphosphinyl Derivatives

以三种新的二苯基氧膦衍生物为载体 ,制成PVC膜化学传感器 ,研究了PVC膜对UO2 + 2 的电位响应特性。在pH 3 .0的0 .1mol/Ltris缓冲液中 ,以BDPPM为载体 ,考察DOP为增塑剂的电极对UO2 + 2 的电位响应 ,线性范围为 3 .2× 10 - 6 ～ 3.0× 10 - 2mol/L ,响应斜率为 2 9± 0 .6mV/dec,响应时间t90 % 小于 3.3min。

Uranyl ion\|selective electrodes(ISEs) have been fabricated from poly(vinyl) chloride) matrix membrane based on three different new diphenylphosphinyl derivatives. The electrode prepared with BDPPM, using dioctyl phthalate(DOP) as a plasticizer, possesses the best potentiometric response characteristics, including a fast response time and response slope. The electrode shows a linear response towards uranyl ion over the concentration range of 3.2×10\+\{-6\}×3.0×10\+\{-2\} mol/L with a slope of 29±0.6 mV/decade in tris buffer solutions of pH 3.0. The electrode exhibits a high selectivity for uranyl over other common ions and has a satisfactory reproducibility.