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题名: Stepwise gradient elution of capillary electrochromatography in the analysis of environmental samples
作者: Zhang, LH;  Zou, HF;  Shi, W;  Ni, JY;  Zhang, YK
关键词: capillary electrochromatography ;  gradient elution ;  stop-flow technique ;  ketones ;  aldehydes ;  aromatic compounds
刊名: JOURNAL OF CAPILLARY ELECTROPHORESIS
发表日期: 1998
卷: 5, 期:1-2, 页:97-102
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Life Sciences & Biomedicine ;  Physical Sciences
类目[WOS]: Biochemistry & Molecular Biology ;  Electrochemistry
研究领域[WOS]: Biochemistry & Molecular Biology ;  Electrochemistry
英文摘要: Two modes of stepwise gradient elution of capillary electrochromatography were developed for the analysis of environmental samples on both a laboratory-made and a commercial CE instrument. Using the laboratory-made apparatus, another mobile phase was dropped directly into the inlet vial with a pipet. By this means, nine 2,4-dinitrophenylhydrazine (DNPH)-derivatized ketones and aldehydes were separated with high resolution. Not only was analysis time shortened by more than one half, but the detection limit was greatly improved compared to that in isocratic elution. The latter was achieved using the P/ACE 5510 system (Beckman Instruments, Fullerton, CA, U.S.A.), which moved the mobile phase vials automatically. The stop-flow technique was utilized during transfer. It had no effect on solute retention. With this method, the concentration and type of organic modifier in the mobile phase could be changed. A mixture of 13 aromatic hydrocarbons was separated completely in 14 min by changing the mobile phase from 80% methanol to 80% acetonitrile and 90% acetonitrile in a sequential step mode. The RSD of the retention time of each component in six consecutive injections was below 0.374%. Al I of these results demonstrate that stepwise grad lent elution of capillary electrochromatography may be useful in the analysis of complex environmental samples.
关键词[WOS]: PERFORMANCE LIQUID-CHROMATOGRAPHY ;  PHASE ;  ELECTROPHORESIS ;  SEPARATION ;  MIXTURES
语种: 英语
WOS记录号: WOS:000080027700015
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/138106
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Chinese Acad Sci, Dalian Inst Chem Phys, Natl Chromatograph R & A Ctr, Dalian 116011, Peoples R China

Recommended Citation:
Zhang, LH,Zou, HF,Shi, W,et al. Stepwise gradient elution of capillary electrochromatography in the analysis of environmental samples[J]. JOURNAL OF CAPILLARY ELECTROPHORESIS,1998,5(1-2):97-102.
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