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Evaluation of Field Application and Optimum Operational Condition for Heavy Metals Analysis Using Environment-Friendly Bismuth Film Electrode

친환경 비스무스 필름 전극을 이용한 중금속 분석 최적조건 도출 및 현장 적용성 평가

  • 김소연 (한국바이오시스템(주) KORBI환경연구소) ;
  • 양용운 (계명문화대학 소방환경안전과) ;
  • 전숙례 (한국바이오시스템(주) KORBI환경연구소)
  • Received : 2011.01.12
  • Accepted : 2011.02.28
  • Published : 2011.02.28

Abstract

This study was conducted to establish the optimal electrolyte and bismuth concentrations using bismuth film electrode in laboratory and to confirm the possibilities of using this operational condition for heavy metals monitoring in field. In lab test, heavy metal measurement was not accurate more than 600 ppb when heavy metal (Pb, Cd, Zn) range 100~1,000 ppb was measured with bismuth 2,000 ppb. So, bismuth and heavy metal was reacted about 1:1 with ASV method. In electrolyte test, 0.1 M acetate buffer (pH 4.5), 0.1 M chloroacetate buffer (pH 2.0), 0.1 M HCl (pH 2.0), 0.1 M $HNO_3$ (pH 2.0) was tested. As a results, 0.1 M acetate buffer was most suitable in ASV measurement with bismuth film electrode. In field application, Pb, Cd and Zn was measured respectively 36~45 ppb, 84~91 ppb, 90~98 ppb when heavy metal (Pb, Cd, Zn) 100 ppb was spiked in field sample. These results were identified of matrix effect in field sample, So relationship between heavy metal measurement and matrix effects will be studied.

본 연구는 실험실 조건에서 비스무스 필름 전극(Bismuth film Electrode)을 사용한 양극산화벗김분석법(Anodic Stripping Voltammetry)에서 비스무스의 첨가 농도와 적정 전해질을 선택하여 최적 조건을 산출하고 최적조건을 기반으로 현장에서 중금속 모니터링 가능 여부를 확인하고자하였다. 비스무스(Bi)와 혼합중금속(Pb, Cd, Zn) 실험을 통해 정확한 중금속의 측정을 위해서는 측정하고자 하는 중금속보다 1:1 이상의 비스무스가 첨가되어야 하는 것으로 나타났다. 전해질 테스트에서는 0.1 M acetate buffer (pH 4.5), 0.1 M chloroacetate buffer (pH 2.0), 0.1 M HCl (pH 2.0), 0.1 M $HNO_3$ (pH 2.0) 중 0.1 M acetate buffer가 비스무스 필름전극을 이용한 중금속 분석에 적용 가능한 것으로 나타났다. 현장 적용시, 중금속 표준용액 100 ppb 첨가 테스트 결과 Pb은 36~45 ppb, Cd는 84~91 ppb, Zn은 90~98 ppb가 측정되었다. 첨가한 중금속보다 낮은 농도로 중금속이 측정되는 것은 현장수 매질 효과에 의한 것으로 파악되었으며, 추후 현장수 매질과 중금속 측정의 상관관계에 대한 연구가 진행될 예정이다.

Keywords

References

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