期刊
SENSORS AND ACTUATORS B-CHEMICAL
卷 99, 期 2-3, 页码 323-329出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2003.11.029
关键词
polymeric membrane; lead cation; ion-selective electrode; meso-tetrakis(2-hydroxy-l-naphthyl)porphyrins; atropisomers
PVC membrane electrodes for lead ion based on meso-tetrakis(2-hydroxy-1-naphthyl)porphyrin (THNP:I) and meso-tetrakis(2-methoxy-1-naphthyl)porphyrin (TMNP: II) atropisomers as membrane carriers were prepared. Among their atropisomers, a membrane electrode (m-3) containing (alpha,alpha,alpha,alpha)-THNP (ID) as an ionophore and 2-nitrophenyl octyl ether (o-NPOE) as a plasticizer displays a good Nernstian response (29.2 +/- 0.3 mV/decade) to Pb2+ in Pb(NO3)(2) solutions over the linear range of 3.2 x 10(-5) to 1 x 10(-1) M at room temperature. The limit of detection was 3.5 x 10(-6) M. It has a fast response time within 10 s over the entire concentration range and the potentials remain constant for more than 5 min and can be used for at least 3 months without any divergence in potentials. The proposed electrode revealed good selectivity and response for Pb2+ over a wide variety of other metal ions in a pH 6.0 buffer solutions and good reproducibility of base line in subsequent measurements. (C) 2003 Elsevier B.V. All rights reserved.
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