Rohani Tahereh, Taher Mohammad Alu
Shahid Bahonar University of Kerman, Department of Chemistry, PO Box 76175-133, Kerman, Iran.
J AOAC Int. 2008 Nov-Dec;91(6):1478-82.
2-(P-sulfophenylazo)-1,8-dihydroxy-3,6-naphthalene disulfate (SPADNS) was adsorbed on surfactant modified zeolite type A by electrostatic interaction in the aqueous phase. The dye was strongly retained and not easily leached from the surfactant-modified zeolite matrix. This compound was incorporated into a carbon paste electrode for anodic stripping voltammetric determination of trace amounts of copper. The calibration plot was linear over the copper concentration range 2.0-800 microg/L. The detection limit was found to be 0.4 microg/L Cu(II), and for 5 successive determinations of 50 and 150 microg/L Cu(II) the relative standard deviations were 1.6 and 1.2%, respectively. The modified electrode prepared in this study could be used for the determination of Cu(II) in water samples and human hair with good results.
2-（对磺基苯偶氮）-1,8-二羟基-3,6-萘二磺酸（SPADNS）通过水相中的静电相互作用吸附在表面活性剂改性的A型沸石上。该染料被强烈保留，不易从表面活性剂改性的沸石基质中浸出。这种化合物被并入碳糊电极中，用于阳极溶出伏安法测定痕量铜。校准曲线在铜浓度范围2.0 - 800μg/L内呈线性。检测限为0.4μg/L Cu（II），对于50μg/L和150μg/L Cu（II）的5次连续测定，相对标准偏差分别为1.6%和1.2%。本研究制备的修饰电极可用于测定水样和人发中的Cu（II），结果良好。
