Solid phase microextraction assisted by droplets-based liquid-liquid microextraction for analysis of volatile aromatic hydrocarbons in water by gas chromatography

被引:7
|
作者
Ciucanu, Ionel [1 ,2 ]
Agotici, Vlad [1 ]
机构
[1] W Univ Timisoara, Dept Chem, RO-300115 Timisoara, Romania
[2] Inst Adv Environm Res, GC MS Lab, Res Ctr Thermal Anal Environm Problems, Timisoara, Romania
关键词
Droplets-based liquid-liquid microextraction; Gas chromatography; Solid phase microextraction; Volatile aromatic hydrocarbons; Water analysis; ORGANIC-COMPOUNDS; EXTRACTION; SOLVENT;
D O I
10.1002/jssc.201101105
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
A new technique for the analysis of volatile aromatic hydrocarbons by combining liquid-liquid microextraction with solid phase microextraction has been developed. The analytes were extracted from aqueous samples by an immobilized polydimethylsiloxane fiber assisted by the droplets of an appropriate organic solvent. Benzene, toluene, ethylbenzene, and o-xylene were used as target analytes. The main factors potentially affecting the microextraction such as the nature and the volume of organic solvent, polydimethylsiloxane (PDMS) swelling, extraction time, agitation, temperature, and salts were optimized. The method requires a very low consumption of organic solvent. The relative enrichment factor is in the range of 7.1-32.4 for extraction in the presence of dichloromethane at an optimum volume of 18 mu L mL(-1) of aqueous sample. This enhancement over regular polydimethylsiloxane fiber is primarily the result of the fiber swelling and of a stable thin layer of organic solvent attached to the surface of the PDMS fiber. The limit of detection ranges from 0.02 to 0.65 ng mL(-1) for the target compounds using a 7-mu m bonded polydimethylsiloxane coating and a flame ionization detector. The validity of this method is demonstrated by the analysis of a real waste water sample.
引用
收藏
页码:1651 / 1658
页数:8
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