期刊
JOURNAL OF CHROMATOGRAPHY A
卷 1178, 期 1-2, 页码 9-16出版社
ELSEVIER
DOI: 10.1016/j.chroma.2007.11.051
关键词
stir bar sorptive extraction (SBSE); thermal desorption (TD); gas chromatography - mass spectrometry (GC-MS); insect repellents; synergists; water samples
Stir bar sorptive extraction (SBSE) in combination with thermodesorption - gas chromatography-mass spectrometry (TD - GC - MS) was applied for the determination of eight insect repellents and synergists in water samples. The stir bar coated with polydimethylsiloxane (PDMS) was added to 20 mL of water sample with 4 g NaCl and stirred at 1000 rpm for 180 min. Then, the stir bar was subjected to TD - GC - MS. SBSE parameters (ionic strength, presence of organic solvent and time) were optimised. Blank contamination and carryover problems were also studied. The method affords detection limits between 0.5 and 30 ng/L, except for dimethyl phthalate (DMP) (150 ng/L) due to blank contamination problems. It shows good linearity with correlation coefficients over 0.997 and reproducibility (RSD) below 20%. The extraction efficiencies were between 29% for DMP and 80% for di-n-propyl isocinchomeronate (R-326). The feasibility of the method was tested by analysing real samples such as lake water, river water and wastewater. (c) 2007 Elsevier B.V. All rights reserved.
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