ASV에 의한 중금속 측정시 유기물 방해를 효과적으로 처리 가능한 전처리장치 개발 및 적용
Development and Application of an Effective Pre-treatment Module to Eliminate Organic Interference in Heavy Metal Analysis by Anodic Stripping Voltammetry
2
조회
0
다운로드
1
인용
0
참고문헌
키워드
초록
As a simple and sensitive analysis for heavy metals in water systems, the anodic stripping voltammetry hasa lot of advantages, compared with other heavy metal analyses. This analysis method, however, is interferedby organic compounds in the matrix. To measure heavy metals with this method more accurately, it is necessaryto perform a proper pre-treatment to break off the bond between organic compounds and heavy metals. In thisstudy, interference effects of organic matters on heavy metal measurements were determined, and then aninstrument combining a UV lamp and electrolysis was developed and applied as a pre-treatment to remove theinferences effects. As a result, interference effects by phenol were not observed, whereas humic acid, a complexcompound, had interference effects on heavy metals measurements. In the matrix of 15 mg/L humic acid,the recovery rates of Cd, Pb and Cu were 40%, 50% and 10%, respectively, at pH 2, whereas the rates wereeach 80%, 50% and 20% at pH 11. The pre-treatment using this instrument resulted in a decomposition rateof around 50% for each organic compound. A proper time for pre-treatment turned out to be approximately10 minutes. This cost-effective pre-treatment module developed in this study might be applicable to variouswater quality analysis systems.
Abstract
As a simple and sensitive analysis for heavy metals in water systems, the anodic stripping voltammetry hasa lot of advantages, compared with other heavy metal analyses. This analysis method, however, is interferedby organic compounds in the matrix. To measure heavy metals with this method more accurately, it is necessaryto perform a proper pre-treatment to break off the bond between organic compounds and heavy metals. In thisstudy, interference effects of organic matters on heavy metal measurements were determined, and then aninstrument combining a UV lamp and electrolysis was developed and applied as a pre-treatment to remove theinferences effects. As a result, interference effects by phenol were not observed, whereas humic acid, a complexcompound, had interference effects on heavy metals measurements. In the matrix of 15 mg/L humic acid,the recovery rates of Cd, Pb and Cu were 40%, 50% and 10%, respectively, at pH 2, whereas the rates wereeach 80%, 50% and 20% at pH 11. The pre-treatment using this instrument resulted in a decomposition rateof around 50% for each organic compound. A proper time for pre-treatment turned out to be approximately10 minutes. This cost-effective pre-treatment module developed in this study might be applicable to variouswater quality analysis systems.
참고문헌 (12)
- J. Wang, "Stripping analysis: Principles, instrumentation and application" (1985), VCH publishing
- A. Manivannan, "Interaction of Pb and Cd during anodic stripping voltammetric analysis at boron-doped diamond electrodes", Electrochemica acta, 49, pp.3313~3318 (2004)
- T. M. Florence, "Anodic stripping voltammetry with medium exchange in trace element speciation", Journal of Electroanal. Chemistry, 200, pp.305~312 (1987)
- T. A. O'Shea, "Characterization of trace metal-organic interactions by anodic stripping voltammetry", Analytical Chemistry, 48, pp.1603~1607 (1976)
- T. M. Florence, "The speciation of trace elements in waters", Talanta, 29, pp.345~364 (1982)
- H. W. Nurnburg, "Voltammetric trace analysis in ecological chemistry of toxic metals", Pure Application Chemistry, 54, pp.853~878 (1982)
- Gilberto A., "Complexation of Cd and Pb with humic acids studied by anodic stripping voltammetry using differential equilibrium functions and discrete site models", Organic Geochemistry, 33, pp.1171~1182 (2002)
- N. Belzile, "Characterization of humic substances extracted from Canadian lake sediments", Canadian Journal of Chemistr, 75, pp.14~27 (1997)
- G. Woldemichael, "Solar UV photooxidation as pretreatment for stripping voltammetric trace metal analysis in river water", International Journal of Electrochemistry, 481370, pp.7~ (2011)
- P. Chakraborty, "Simultaneous determination of speciation parameters of Cu, Pb, Cd and Zn in model solutions of Suwannee River fulvic acid by pseudopolarography", Analytical Bioanalytical Chemistry, 388, pp.463~474 (2007)
- T. Elkovic, "Copper(II)and lead(II)complexation by humic acid and humic-like ligands", Journal of the Serbian Chemistry Society, 76, pp.1325~1336 (2011)
- P. Meng, "An algorithm for eliminating the interference derived from organic ligands in heavy metal analysis by anodic stripping voltammetry", Acta Oceanographic Taiwan, 41, pp.33~46 (2003)