Lead ion-selective electrodes based on polyphenylenediamine as unique solid ionophores
Lead ion-selective electrodes based on polyphenylenediamine as unique solid ionophores
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基于聚苯二胺作为独特固体离子载体的铅离子选择性电极
DOI：
10.1016/j.talanta.2011.06.049
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发表时间：
2011-09-15
期刊：
影响因子：
6.1
通讯作者：
Ding, Yong-Bo
中科院分区：
文献类型：
--
作者：
Huang, Mei-Rong;Rao, Xue-Wu;Ding, Yong-Bo
制备了一种基于半导体聚苯二胺微粒作为固体离子载体的新型铅离子检测膜电极。在pH 3.0-5.0范围内，电极对Pb（II）的响应在3.16 × 10（-6）至0.0316 M的浓度范围内表现出显著增强，低检测限为6.31 × 10(-7) M，灵敏度高，Pb（II）的近nern斯蒂斜率为29.8 my decade（-1）。电极寿命长达5个月，响应时间短，仅为14s。用固定干扰法系统研究了阴离子排除剂和各种外来离子对电极选择性的影响，结果表明，除高浓度汞外，其他金属离子对Pb（II）的测定几乎没有干扰。该电极成功地用作EDTA电位滴定Pb（II）的指示电极。此外，该电极已用于令人满意地分析四种实际样品，如加标的人尿，加标的自来水和含有干扰离子的河水，如Na(I), Ca(II), Mg(II), Zn(II), Pd(II), Fe(III)， K(I), Cu（II）和Hg（II）高达8.04 x 10(-4) M，具有快速响应，高选择性，良好的回收率（96.6-121.4%）。重复性好（RSD 0.31 ~ 6.45%），相对误差小（5.0%）。(C) 2011 Elsevier B.V.版权所有
A novel membrane electrode for Pb(II) ion detection based on semi-conducting poly(mphenylenediamine) microparticles as a unique solid ionophore was fabricated. The electrode exhibited significantly enhanced response towards Pb(II) over the concentration range from 3.16 x 10(-6) to 0.0316 M at pH 3.0-5.0 with a low detection limit of 6.31 x 10(-7) M, a high sensitivity displaying a near-Nernstian slope of 29.8 my decade(-1) for Pb(II). The electrode showed a long lifetime of 5 months and a short response time of 14s. A systematical investigation on the effect of anion excluder and various foreign ions on the selectivity of the electrode by a fixed interference method suggests that all other metal ions hardly ever interfere with the determination of Pb(II) except high concentration Hg(II). The electrode was successfully used as an indicator electrode in the potentiometric titration of Pb(II) with EDTA. Furthermore, the electrode has been used to satisfactorily analyze four types of real-world samples like spiked human urine, spiked tap water, and river water containing interfering ions like Na(I), Ca(II), Mg(II), Zn(II), Pd(II), Fe(III), K(I), Cu(II) and Hg(II) up to 8.04 x 10(-4) M, demonstrating fast response, high selectivity, good recovery (96.6-121.4%). good repeatability (RSD 0.31-6.45%), and small relative error (5.0%). (C) 2011 Elsevier B.V. All rights reserved.