五氯苯酚离子选择电极的研制

Study On Pentachlorophenolate Ion Selective Eletrode

本文报道以三庚基十二烷基铵与三氯苯酚离子缔合物为电极活性物制备的PVC膜五氯苯酚离子选择电极。该电极具有Nernst响应范围宽2×10^(-5)M～1×10^(-1)M、灵敏度高.斜率S为60、检测下限低5×10^(-6)M、选择较好、响应时间短等特点、且电极连续工作电势读数稳定性好等优点。适用于自动监测及电位滴定分析。

PVC membrance pentaclorophenolate ISE was prepared with triheptyld?decyl ammonium saltas active material. The potential Nernst response range was 2×10^(-5)-1×20^(-1)M and its detectionlimit of the electrode was 2×10^(-?)M. The selectiviy coefficients of this electrode for an?ons suchas, Cl^-, CO_3^-, SO_4^-, HPO_4^-, C_6H_5O^-etc., which may exist in the testing solutions, were deter-mined and sougnt that only C_6H_5O^- caused interferenece slightly. When the electrode was used in an alkaine solution i.e. pH 9.0--12.9,the change of theelectrode potential response value was only ± 1mV for six hours. Therefore these electrodes may be applied to continuously monitor the concentration of PCPin process wastes and to analyse the solution extracted from different samples.