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DEVELOPMENT OF MINIATURIZED ANALYTICAL SYSTEM FOR RESIDUAL CHLORINE WITH ELECTROCHEMICAL SENSORS

Research Project

Project/Area Number 15550067
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Analytical chemistry
Research InstitutionShinshu University

Principal Investigator

JIN Jiye  Shinshu Univ., Faculty of Science, Associate Professor, 理学部, 助教授 (40252118)

Co-Investigator(Kenkyū-buntansha) SUZUKI Yasutada  Yamanashi Univ., Faculty of Engineering, Assistant Professor, 大学院・医工学総合研究部, 助手 (20262644)
Project Period (FY) 2003 – 2004
Project Status Completed (Fiscal Year 2004)
Budget Amount *help
¥3,100,000 (Direct Cost: ¥3,100,000)
Fiscal Year 2004: ¥1,400,000 (Direct Cost: ¥1,400,000)
Fiscal Year 2003: ¥1,700,000 (Direct Cost: ¥1,700,000)
KeywordsResicual chlorine / Portable potentiostat / Amperometric sensor / Micro-flow injection analysis / Overlapped peak resolution / デジタルカメラ / 色彩分析法 / 簡易分析法 / ミクロフローインジェクション分析
Research Abstract

Chlorine in aqueous solutions is used for a number of purposes, such as disinfection and bleaching, and also as a powerful oxidizing agent in various manufacturing processes. It is known that chlorine is highly toxic, and additionally it can further react with other substances, such as phenols, in environment to produce chlorophenols, which are suspected to be carcinogens. Thus, the development of the new methods and devices for the reliable and continuous measurement of residual chlorine at trace levels had been conducted in the present work.
Residual chlorine in water is generally present in the fibrin of hypochlorous acid (HOCl), or its conjugated base, the hypochlorite ion (ClO-). It was confirmed in this study that gold electrode exhibited very large reductive currents as well as good stability compared with platinum and glassy carbon electrodes in the pH range of 4-8. Based on the electrochemical sensors with gold electrode, the present study developed a portable miniaturized FIA … More system for on-site monitoring of residual chlorine in environmental samples. As for the purpose of on-site determination, miniaturization of the potentiostat along with a reduction in the complexity of the chip, low power consumption and a high dynamic range was developed in the current work. The potentiostat was built using an embedded controller microprocessor, an A/D converter a D/A converter, and operational amplifiers. It is available operated by a battery for a video camcorder (Sony NP-F550, 7.2 V 1500 mA/H). The size of the potentiostat is 150×100×40 mm and weight is only 350 g. The electrochemical measurements were controlled by a notebook computer and a laboratory-written software package via an RS-232C interface. It was confirmed that the amperometric response increased in proportion to the chlorine concentration up to 5μg/ml, and the detection limit for chlorine was 0.05 μg/ml. Besides a drastic reduction the size of the analytical system, such miniaturization achieved the advantages of increased speed, minimal mobile-phase consumption, and high sensitivity. The proposed method was successfully applied to the determination of residual chlorine in samples of pool water and tap water. The results were well agreed with those obtained by the N,N-diethyl-p-phenylenediamine (DPD) photometric method.
The electrochemical behavior of trace chlorine was also studied in the presence of DPD at glassy carbon electrode by square wave voltammetry. In the lower pH value, a new reduction wave (+0.4 V vs Ag/AgCl) was observed, which is closely followed by the reduction of DPD (+0.5 V vs Ag/AgCl). The new peak at ca. +0.4 V was suggested to be generated by chlorinated product of DPD which is in proportion to the concentration of chlorine. But this peak was seriously overlapped by the background of DPD when the concentration of chlorine is low. In this study, signals-ratio method combined with wavelet transform was proposed for the resolution of a weak voltanunteric signal overlapped by other coexisted components. With the proposed method, the overlapped voltammetric peaks can be well separated and thereby the chlorine at trace level could be determined in a linear range of 0 to 100 μM with a detection limit of 0.5 μM. The advantages of proposed method are sensitive and free of some oxidant interthrences which could be a problem in DPD colorimetric method. The mechanism and the application in determination of real samples are now in progress. Less

Report

(3 results)
  • 2004 Annual Research Report   Final Research Report Summary
  • 2003 Annual Research Report
  • Research Products

    (12 results)

All 2004 Other

All Journal Article (8 results) Publications (4 results)

  • [Journal Article] Wavelet derivatives : application in multicomponent analysis of electrochemical signals2004

    • Author(s)
      X.Zhang, J.Jin
    • Journal Title

      Electroanalysis 16(18)

      Pages: 1514-1520

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Annual Research Report 2004 Final Research Report Summary
  • [Journal Article] A miniaturized FIA system for determination of residual chlorine in environmental water samples2004

    • Author(s)
      J.Jin, Y.Suzuki, N.Ishikawa, T.Takeuchi
    • Journal Title

      Anal.Sci. 20(1)

      Pages: 205-207

    • NAID

      10011942932

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Signals-ratio method combined with wavelet transform : application for resolution of overlapped electrochemical signals2004

    • Author(s)
      X.Zhang, J.Jin
    • Journal Title

      Analytical and Bioanalytical Chemistry 380

      Pages: 751-756

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Annual Research Report 2004 Final Research Report Summary
  • [Journal Article] A Simple and Portable Colorimeter Using a Red-Green-Blue Light-Emitting Diode and its Application to the On-Site Determination of Nitrite and Iron in River-water2004

    • Author(s)
      Y.Suzuki, T.Aruga, H.Kuwahara, M.Kitamura, T.Kuwabara, S.Kawakubo, M.Iwatsuki
    • Journal Title

      Anal.Sci. 20(6)

      Pages: 975-977

    • NAID

      10013105193

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Annual Research Report 2004 Final Research Report Summary
  • [Journal Article] セミミクロ定量分析実験のための小型電気化学分析装置の開発2004

    • Author(s)
      鈴木保任, 伊藤隆之, 深沢二夫, 川久保進, 岩附正明
    • Journal Title

      分析化学 53(11)

      Pages: 1303-1308

    • NAID

      110002909983

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Annual Research Report 2004 Final Research Report Summary
  • [Journal Article] 宇宙船内で使用される水の簡易現場分析法2004

    • Author(s)
      鈴木保任
    • Journal Title

      化学と工業 57(11)

      Pages: 1209-1209

    • NAID

      10013742163

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Annual Research Report 2004 Final Research Report Summary
  • [Journal Article] Compact electroanalytical instruments for quantitative semimicro analysis experiments2004

    • Author(s)
      Y.Suzuki, T.Ito, T.Fukusawa, S.Kawakubo, M.Iwatsuki
    • Journal Title

      Bunseki Kagaku 53(11)

      Pages: 1303-1308

    • NAID

      110002909983

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] A miniaturized FIA system for determination of residual chlorine in environmental water samples2004

    • Author(s)
      J.Jin, Y.Suzuki, N.Ishikawa, T.Takeuchi
    • Journal Title

      Anat.Sci. 20(I)

      Pages: 205-207

    • NAID

      10011942932

    • Related Report
      2004 Annual Research Report
  • [Publications] L.W.Lim, J.Jin, T.Takeuchi: "Determination of inorganic anions in neutral water by microcolumn ion chromatography with on-column enrichment"Analytical Sciences. 19. 447-449 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] H.Tamagawa, F.Nogata, T.Watanabe, A.Abe, K.Yagasaki, J.Jin: "Influence of metal plating treatment on the electric response of Nafion"Journal of Materials Science. 38(5). 1039-1044 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] J.Jin, Y.Suzuki, N.Ishikawa, T.Takeuchi: "A miniaturized FIA system for determination of residual chlorine in environmental water samples :"Analytical Sciences. 20. 205-207 (2004)

    • Related Report
      2003 Annual Research Report
  • [Publications] Y.Suzuki, H.Hori, M.Iwatsuki, T.Yamane: "A Four-Wavelength Channel Absorbance Detector with a Light Emitting Diode-Fiber Optics Assembly for Simplifying the Flow-Injection Analysis System"Analytical Sciences. 19. 1025-1028 (2003)

    • Related Report
      2003 Annual Research Report

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Published: 2003-04-01   Modified: 2016-04-21  

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