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题名: New cloud vapor zone (CVZ) coupled headspace solid-phase microextraction technique
作者: Huang, Yi-Ching;  Su, Yi-Song;  Muniraj, Sarangapani;  Zhang, Weibing;  Jen, Jen-Fon
关键词: cloud vapor zone ;  headspace ;  solid-phase microextraction ;  chlorothalonil
刊名: ANALYTICAL AND BIOANALYTICAL CHEMISTRY
发表日期: 2007-05-01
DOI: 10.1007/s00216-007-1212-4
卷: 388, 期:2, 页:377-383
收录类别: ISTP ;  SCI
文章类型: Article
WOS标题词: Science & Technology ;  Life Sciences & Biomedicine ;  Physical Sciences
类目[WOS]: Biochemical Research Methods ;  Chemistry, Analytical
研究领域[WOS]: Biochemistry & Molecular Biology ;  Chemistry
英文摘要: A new cloud vapor zone (CVZ)-based headspace solid-phase microextraction (HS-SPME) technique has been demonstrated with the capability of heating the sample matrix and simultaneously cooling the sampling zone. A bi-temperature-controlled (BTC) system, allowing 10 mL of test sample heating and headspace external-cooling, was employed for the CVZ formation around the SPME-fiber sampling area. In the CVZ procedure, the heated headspace vapor undergoes a sudden cooling near the SPME to form a dense cloud of analyte-water vapor, which is helpful for adsorption or absorption of the analyte. The device was evaluated for the quantitative analysis of aqueous chlorothalonil. Parameters influencing sampling efficiency, e.g., SPME fiber coating, SPME sampling temperature and time, solution modifier, addition of salt, sample pH, and temperature, were investigated and optimized thoroughly. The proposed BTC-HS-SPME method afforded a best extraction efficiency of above 94% accuracy (less than 4.1% RSD, n = 7) by using the PDMS fiber to collect chlorothalonil in the headspace at 5 degrees C under the optimized condition, i.e., heating sample solution (added as 10% ethylene glycol and 30% NaCl, at pH 7.0) at 130 degrees C for 15 min. The detection was linear from 0.01 to 80 mu g L-1 with a regression coefficient of 0.9998 and had a detection limit of 3.0 ng L-1 based on S/N = 3. Practical application was demonstrated by analyzing chlorothalonil in farm water samples with promising results and recoveries. The approach provided a very simple, fast, sensitive, and solvent-free procedure to collect analytes from aqueous solution. The approach can provide a new platform for other sensitive HS-SPME assays.
关键词[WOS]: GAS-CHROMATOGRAPHY ;  QUANTITATIVE EXTRACTION ;  ELECTRON-CAPTURE ;  WATER ;  PESTICIDES ;  CHLOROTHALONIL ;  DEVICE
语种: 英语
WOS记录号: WOS:000246094000009
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/140429
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.Natl Chung Hsing Univ, Dept Chem, Taichung 40217, Taiwan
2.Chinese Acad Sci, Dalian Inst Chem Phys, Dalian 116023, Peoples R China

Recommended Citation:
Huang, Yi-Ching,Su, Yi-Song,Muniraj, Sarangapani,et al. New cloud vapor zone (CVZ) coupled headspace solid-phase microextraction technique[J]. ANALYTICAL AND BIOANALYTICAL CHEMISTRY,2007,388(2):377-383.
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