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제116회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Constant current mode electromembrane extraction with capillary electrophoresis for sensitive arsenic speciation

2015년 8월 27일 10시 12분 45초
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목 09시 : 24분
분석화학 - Oral Presentation of Young Analytical Chemists I
저자 및
정선경, Hongfei Zhang1, Sun Xingnan2, 정두수3,*
서울대학교 화학부, Korea
1Lanzhou institute of chemical physics, China
2서울대학교 화학부, China
3서울대학교 화학부, Korea
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승인 1건
Arsenic is an element widely distributed in the crust of the earth, causing a worldwide problem of groundwater contamination. Four arsenic compounds dimethylarsinic acid (DMA), arsenites [As(III)], mono methylarsenic acid (MMA), and arsenates [As(V)] in a unbuffered water sample were enriched by constant current mode electromembrane extraction (CC-EME) and then analyzed by off-line coupled capillary electrophoresis (CE). Under an electrical potential, CH3(C8H17)3N+ Cl- (Aliquat 336) in the supported liquid membrane (SLM) acts as a carrier to mediate the transfer of anionic arsenic analytes such as DMA, MMA, and As(V) from the sample solution to an aqueous acceptor phase. Neutral As(III) was oxidized to As(V) by potassium permanganate and then enriched by CC-EME for indirect determination. Several parameters such as the electrode configuration, composition of SLM, pH of donor and acceptor phase, stirring rate, applied current, and extraction time were optimized. Under the optimal conditions, enrichment factors of 1200 to 3600 for the 4 arsenic species were obtained. The LODs for the 4 arsenic species in unbuffered water were 0.4 to 1.0 ppb As, each of which was below the WHO guideline of 10 ppb total arsenic. The established CC-EME was successfully applied for the arsenic species determination in unbuffered water with a high enrichment factor, high sensitivity, low cost and environmental friendly.