title: Physically incorporated extraction phase of solid-phase microextraction by sol-gel technology.
abstract: A sol-gel method for the preparation of solid-phase microextraction (SPME) fiber was described and evaluated. The extraction phase of poly(dimethysiloxane) (PDMS) containing 3% vinyl group was physically incorporated into the sol-gel network without chemical bonding. The extraction phase itself is then partly crosslinked at 320 degrees C, forming an independent polymer network and can withstand desorption temperature of 290 degrees C. The headspace extraction of BTX by the fiber SPME was evaluated and the detection limit of o-xylene was down to 0.26 ng/l. Extraction and determination of organophosphorus pesticides (OPPs) in water, orange juice and red wine by the SPME-GC thermionic specified detector (TSD) was validated. Limits of detection of the method for OPPs were below 10 ng/l except methidathion. Relative standard deviations (RSDs) were in the range of 1-20% for pesticides being tested.
authors.affiliation: Department of Analytical Chemistry and Micro-Instrumentation, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian 116023, China.
authors.forename: Wenmin
authors.initials: W
authors.lastname: Liu
authors.forename: Yuan
authors.initials: Y
authors.lastname: Hu
authors.forename: Jinghong
authors.initials: J
authors.lastname: Zhao
authors.forename: Yuan
authors.initials: Y
authors.lastname: Xu
authors.forename: Yafeng
authors.initials: Y
authors.lastname: Guan
mesh_terms: D002849:Chromatography, Gas / Q000379:methods*; D005782:Gels; D008855:Microscopy, Electron, Scanning; D010575:Pesticides / Q000032:analysis; D012015:Reference Standards; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity
chemical_list: D005782:Gels; D010575:Pesticides