Pilehvari Zahra, Yaftian Mohammad Reza, Rayati Saeed, Parinejad Massoumeh
Department of Chemistry, Faculty of Science, University of Zanjan, P.O. Box 45195-313, Zanjan, Iran.
Ann Chim. 2007 Aug;97(8):747-57. doi: 10.1002/adic.200790058.
The preparation of a lead-selective electrode based on bis(1'-hydroxy-2'-acetonaphthone)-2,2'-diiminodiethylamine (L) as sensing material is reported. The plasticized PVC membrane containing 30% PVC, 67% ortho-nitrophenyloctylether (NPOE) and 3% ionophore L was directly coated on a graphite rod. This electrode exhibits a nearly Nernstian slope of 27.8+/-0.2 mV decade(-1) over a concentration range 10(-6)-10(-2) M with a detection limit of 4.0 x 10(-7) M. The response time of the electrode was found to be <20 s. The potential of the sensor was independent on pH variations in the range 5-7. The selectivity of the electrode towards lead ions over Na+, K+, Ag+, Ca2+, Sr2+, Fe2+, Co2+, Ni2+, Cu2+, Zn2+, Cd2+, La3+, Sm3+ and Er3+ ions was investigated. The prepared electrode was successfully used as an indicator for titration of a lead solution with a standard solution of EDTA. The applicability of the sensor for Pb2+ measurement in various synthetic and real samples has been also demonstrated.
报道了一种基于双（1'-羟基-2'-乙酰萘）-2,2'-二亚氨基二乙胺（L）作为传感材料的铅选择性电极的制备。含有30%聚氯乙烯（PVC）、67%邻硝基苯基辛醚（NPOE）和3%离子载体L的增塑PVC膜直接涂覆在石墨棒上。该电极在10⁻⁶ - 10⁻² M的浓度范围内呈现出近能斯特斜率，为27.8±0.2 mV/十倍浓度变化，检测限为4.0×10⁻⁷ M。发现电极的响应时间<20 s。传感器的电位在pH值5 - 7范围内与pH变化无关。研究了该电极对铅离子相对于Na⁺、K⁺、Ag⁺、Ca²⁺、Sr²⁺、Fe²⁺、Co²⁺、Ni²⁺、Cu²⁺、Zn²⁺、Cd²⁺、La³⁺、Sm³⁺和Er³⁺离子的选择性。制备的电极成功用作以乙二胺四乙酸（EDTA）标准溶液滴定铅溶液的指示剂。还证明了该传感器在各种合成样品和实际样品中用于测量Pb²⁺的适用性。
