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题名:
Potentiometric flow injection system for determination of reductants using a polymeric membrane permanganate ion-selective electrode based on current-controlled reagent delivery
作者: Song, Wenjing1,2; Ding, JiaWang(丁家旺)1; Liang, Rongning1; Wei Qin(秦伟)1
刊名: ANALYTICA CHIMICA ACTA
出版日期: 2011-10-17
卷号: 704, 期号:1-2, 页码:68-72
关键词: Potentiometry ; Flow injection analysis ; Ion-selective electrodes ; Reductants ; Current-controlled release
学科分类: 化学
产权排序: Chinese Acad Sci, Shandong Prov Key Lab Coastal Zone Environm Proc, Yantai Inst Coastal Zone Res, Yantai 264003, Peoples R China;Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China
通讯作者: Qin, W (通讯作者),Chinese Acad Sci, Shandong Prov Key Lab Coastal Zone Environm Proc, Yantai Inst Coastal Zone Res, Yantai 264003, Peoples R China
中文摘要: A polymeric membrane permanganate-selective electrode has been developed as a current-controlled reagent release system for potentiometric detection of reductants in flow injection analysis. By applying an external current, diffusion of permanganate ions across the polymeric membrane can be controlled precisely. The permanganate ions released at the sample-membrane interface from the inner filling solution of the electrode are consumed by reaction with a reductant in the sample solution thus changing the measured membrane potential, by which the reductant can be sensed potentiometrically.Ascorbate, dopamine and norepinephrine have been employed as the model reductants. Under the optimized conditions, the potential peak heights are proportional to the reductant concentrations in the ranges of 1.0 × 10−5 to 2.5 × 10−7 M for ascorbate, of 1.0 × 10−5 to 5.0 × 10−7 M for dopamine, and of 1.0 × 10−5 to 5.0 × 10−7 M for norepinephrine, respectively with the corresponding detection limits of 7.8 × 10−8, 1.0 × 10−7 and 1.0 × 10−7 M. The proposed system has been successfully applied to the determination of reductants in pharmaceutical preparations and vegetables, and the results agree well with those of iodimetric analysis.
英文摘要: A polymeric membrane permanganate-selective electrode has been developed as a current-controlled reagent release system for potentiometric detection of reductants in flow injection analysis. By applying an external current, diffusion of permanganate ions across the polymeric membrane can be controlled precisely. The permanganate ions released at the sample-membrane interface from the inner filling solution of the electrode are consumed by reaction with a reductant in the sample solution thus changing the measured membrane potential, by which the reductant can be sensed potentiometrically. Ascotbate, dopamine and norepinephrine have been employed as the model reductants. Under the optimized conditions, the potential peak heights are proportional to the reductant concentrations in the ranges of 1.0 x 10(-5) to 2.5 x 10(-7) M for ascorbate, of 1.0 x 10(-5) to 5.0 x 10(-7) M for dopamine, and of 1.0 x 10(-5) to 5.0 x 10(-7) M for norepinephrine, respectively with the corresponding detection limits of 7.8 x 10(-8), 1.0 x 10(-7) and 1.0 x 10(-7) M. The proposed system has been successfully applied to the determination of reductants in pharmaceutical preparations and vegetables, and the results agree well with those of iodimetric analysis. (C) 2011 Elsevier B.V. All rights reserved.
研究领域[WOS]: Chemistry
关键词[WOS]: L-ASCORBIC-ACID ; AMINO-ACIDS ; COPPER WIRE ; FIA SYSTEM ; DETECTOR ; DOPAMINE ; ANIONS
文章类型: Article
收录类别: SCI
语种: 英语
WOS记录号: WOS:000296824600007
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.yic.ac.cn/handle/133337/5166
Appears in Collections:中科院海岸带环境过程与生态修复重点实验室_期刊论文
环境化学实验室_期刊论文
山东省海岸带环境过程重点实验室_期刊论文

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作者单位: 1.Chinese Acad Sci, Shandong Prov Key Lab Coastal Zone Environm Proc, Yantai Inst Coastal Zone Res, Yantai 264003, Peoples R China
2.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China

Recommended Citation:
Song, Wenjing,Ding, Jiawang,Liang, Rongning,et al. Potentiometric flow injection system for determination of reductants using a polymeric membrane permanganate ion-selective electrode based on current-controlled reagent delivery[J]. ANALYTICA CHIMICA ACTA,2011,704(1-2):68-72.
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