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  • 09월 01일 18시 이후 : 초록수정 불가능, 일정확인 및 검색만 가능

제118회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Headspace in-tube microextraction of dichlorophenols using a commercial capillary electrophoresis instrument

2016년 8월 25일 15시 13분 04초
ANAL2.O-14 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
금 09시 : 39분
분석화학 - Oral Presentation of Young Analytical Chemists Ⅱ
저자 및
최윤정, 정두수*
서울대학교 화학부, Korea
Solid phase microextraction (SPME) and liquid phase microextraction (LPME) are commonly employed for headspace (HS) extraction, which is useful for the concentration of volatile materials in a complex matrix. Among LPME methods, single drop microextraction (SDME) is widely used for HS extraction to be off-line coupled with GC and LC. By forming a single acceptor drop at the tip of a capillary using a commercial capillary electrophoresis (CE) instrument, we showed that SDME can be easily in-lined coupled with CE to achieve high sample enrichments in a short time. However, it is difficult to hang a drop of very small volume to a separation capillary in the HS stably for long extraction. Recently this problem was solved by in-tube microextraction (ITME) using the liquid plug inside the capillary as an acceptor phase without hanging a drop. HS-ITME-CE was performed to enrich dichlorophenol in an aqueous solution. To promote the evaporation of the acidic dichlorophenols into the HS as neutral forms, the donor was acidified by adding HCl. To promote back extraction from the HS, a short acceptor plug of 400 mM borate buffer of pH 9.3 was used. The subsequent CE was carried out using a run buffer of 240 mM borate buffer of pH 9.2. With a 15-min extraction at 80°C, dichlorophenols were enriched about 300 times.