铅基磷酸铅化学修饰电极的研究

Research on Chemically Modified Electrode of Phosphate Based on Lead

本文研制了铅基磷酸铅化学修饰电极(CME),并研究了该CME的性能.实验发现,该CME是一种磷酸根离子敏感电极.电极对磷酸盐有类能斯特响应,在PH 4.0和 6.0下,其线性范围分别为l×10～(-3)～1×10～(-1)和1×10～(-4)～1×10～(-2)mol/L磷酸盐,电极响应斜率为23～27 mV/dec.电极有较好的稳定性和重现性,可望用于磷酸盐的实际分析.

A chemically modified electrode of Pb-Pb3(PO4)2 was prepared, and the property of the electrode was investigated. The electrode was noted for the characteristic of a chemical sensor. It gives a linear response of the potential with respect to the logarithm of phosphate concentration in the range of 1×10-3- 1×10 l or 1 × 10 4-1×10-2 mol/L at pH 4. 0 or pH 6. 0 with a slope of 23-27 mV/dec. The electrode shows a better stability and repro-ducibility of response for phosphate.