期刊
TALANTA
卷 65, 期 3, 页码 730-734出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.talanta.2004.07.043
关键词
PVC; arsenite; potentiometric sensor; chemical sensors
PVC based membranes of 5,10,15,20-tetrakis(4-methoxyphenyl)porphyrinatocobalt(II) (TMOPP-Co) (1) as electroactive material with dibutyl butyl phosphonate (DBBP), dioctyl phthalate (DOP), 1-chloronaphthalene (CN), tri-n-butyl phosphate (TBP) and tris(2-ethylhexyl) phosphate (TEP) as plasticising solvent mediators have been prepared and tried for arsenite determination. The membrane having a composition 150:5 :150 (PVC:I:DBBP) exhibited the best results with linear potential response in the concentration range of 7.9 x 10(-5) to 1.0 x 10(-1) M of AsO2- with a slope of 28.8 mV/decade. The useful pH range of the sensor is 6.0-10.5. The membrane worked satisfactorily in non-aqueous medium up to 5% (v/v) non-aqueous content. The selectivity coefficient values for mono- and divalent anions indicate good selectivity for arsenite over a large number of anions. (C) 2004 Elsevier B.V. All rights reserved.
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