폐기물 중 수은 분석을 위한 액상시료의 자동수은분석기 적용 연구 = Applications of DMA (Direct Mercury Analyser) for Mercury Analysis in Liquid Sample Extracted from Solid Waste

다국어 초록 (Multilingual Abstract)

In a mercury leaching test for waste using the Korean Standard Method (ES 06404.1), the pre-treatment process of aneluate is very complicated with a high possibility of contamination and low mercury recovery rate. It is also difficult toanalyze multiple samples in a short time and the process generates experimental wastes. Accordingly, a direct mercuryanalyzer (DMA) applying thermal decomposition gold-amalgamation analysis has been recently used. The method showsa relatively high recovery rate for solid samples without complicated pre-treatment and it can be applied to both liquidand solid samples as the EPA method 7473 does. In order to use the auto-sampler in DMA for analyzing many elutionsamples from waste, this study checked recovery rates depending on acid solutions and additives during continuousanalysis. The result showed a significant drop in recovery and precision except for an L-cysteine added sample.
Considering commonly used acid-treatment of wastes, three types of acid solutions (nitrate, hydrochloric acid and sulfate)were chosen for analysis, and precision and accuracy were relatively high in nitric acid solution. It has been determinedthat accuracy and precision improved when 0.01% L-cysteine was added as an additive and this reduced the impact ofcontinuous measurement. Therefore, during analysis of liquid samples or eluted samples using DMA continuously,introducing suitable additives is necessary depending on pre-treatment method in order to improve accuracy and precisionin the analysis of mercury.

참고문헌 (Reference)

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