摘要
This paper describes a novel method in which solvent microextraction（SME） is followed by on-line back-extraction-field amplified sample injection（OLBE-FASI） in capillary zone electrophoresis（CZE）.The water-immiscible solution sample, sealed with water plug in the sample vial,was used for direct electroinjection. The water plug with moderate content of organic solvent,low-conductivity,and the presence of a small（amount） of H+ provided the highest sensitivity for analyzing positively chargeable compounds,such as cocaine and thebaine.The linear range was 0.040—4,0.040—2 μg/mL,with the square of the correlation coefficient(r2)>0.997,respectively.Detection limits were in the range of 5—10 ng/mL.
This paper describes a novel method in which solvent microextraction （SME） is followed by on-line back-extraction-field amplified sample injection （OLBE-FASI） in capillary zone electrophoresis （CZE）. The water-immiscible solution sample, sealed with water plug in the sample vial, was used for direct electroinjection. The water plug with moderate content of organic solvent, low-conductivity, and the presence of a small amount of H ＋ provided the highest sensitivity for analyzing positively chargeable compounds, such as cocaine and thebaine. The linear range was 0. 040---4, 0. 040--2 μg/mL, with the square of the correlation coeffi- cient（r^2） 〉0. 997, respectively. Detection limits were in the range of 5--10 ng/mL.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
2006年第5期856-858,共3页
Chemical Journal of Chinese Universities
基金
国家自然科学基金(批准号:20375028)
国家"八六三"计划项目(批准号:2002AA2Z2004)资助
关键词
溶剂微萃取
在线反萃取
场放大进样
Solvent microextraction
On-line back-extraction
Field amplified sample injection
