| Development and Application of an Effective Pre-treatment Module to Eliminate Organic Interference in Heavy Metal Analysis by Anodic Stripping Voltammetry |
| ASV에 의한 중금속 측정시 유기물 방해를 효과적으로 처리 가능한 전처리장치 개발 및 적용 |
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방재현, 박선구, 박성호, 홍금용 |
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비엘프로세스(주) |
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| Abstract |
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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. |
| Key Words:
ASV, Heavy metal, Treatment, UV, Voltammetry |
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