Department of Chemistry, Tarbiat Modarres University, P.O. Box 14115-111, Tehran, Iran.
Talanta. 2003 Jul 4;60(4):775-86. doi: 10.1016/S0039-9140(03)00138-3.
A new graphite coated electrode for the determination of Pb(2+) based on a recently synthesized ionophore 1-hydroxy-2-{2-[2-(2-hydroxy-ethoxy)-ethoxy]-ethoxy methyl}-anthracene-9,10-dione (L) has been developed. The electrode was used in flow injection potentiometry by a home-made flow cell. Under both the batch and flow conditions, the electrode revealed a near Nernstian response over a wide lead ion concentration range (10(-6) to 10(-1) M) and very low limit of detection. In flow injection potentiometry, excellent reproducibility (RSD%=0.49%), very high sampling rate (170 injections h(-1)) and stable baseline was observed in the presence of 10(-3) M KCl as ionic strength adjuster. The electrode showed high sensitivity and good selectivity for Pb(2+) over a wide variety of alkali, alkali earth and transition metal ions and the electrode can be used for at least 3 months without any considerable change in potential response. The proposed sensor was successfully applied to the direct determination of lead in real samples and also used for the titrimetric determination of phosphate ions by both batch and flow injection potentiometry.
一种新的石墨涂层电极，用于测定 Pb(2+)，基于最近合成的离子载体 1-羟基-2-{2-[2-(2-羟乙氧基)-乙氧基]-乙氧基甲基}-蒽-9,10-二酮（L）。该电极在家用流动池的流动注射电位法中使用。在批处理和流动条件下，电极在很宽的铅离子浓度范围内（10(-6) 到 10(-1) M）显示出近 Nernst 响应，并且检测限非常低。在流动注射电位法中，在存在 10(-3) M KCl 作为离子强度调节剂的情况下，观察到极好的重现性（RSD%=0.49%）、非常高的采样率（170 次注射 h(-1)）和稳定的基线。该电极对 Pb(2+)具有高灵敏度和良好的选择性，对各种碱、碱土和过渡金属离子均适用，并且在电位响应没有明显变化的情况下，电极可以至少使用 3 个月。该传感器已成功应用于实际样品中铅的直接测定，也用于通过批处理和流动注射电位法测定磷酸盐离子的滴定法测定。
