[Determination of polycyclic aromatic hydrocarbons in Dianchi Lake using stir bar sorptive extraction-thermal desorption-gas chromatography/mass spectrometry].
A fast method for determination of polycyclic aromatic hydrocarbons (PAHs) in water samples was established. The samples from the Dianchi Lake and Panlong River were analyzed directly using stir bar sorptive extraction-thermal desorption system-gas chromatography/ mass spectrometry (SBSE-TDS-GC/MS). Polydimethylsiloxane (PDMS) was used as the extraction phase. The samples were extracted with stir bars at 1100 r/min for 60 min at ambient temperature (25 degrees C). Desorption was carried out at 300 degrees C for 5 min under a helium flow of 50 mL/min in the splitless mode while maintaining a cryofocusing temperature of 0 degrees C in the programmed-temperature vaporization (PTV) injector of the GC/MS system. The limits of detection of PAHs ranged from 1.0 pg to 468.8 pg. The theoretical recoveries of PAHs were greater than 90% (except that naphthalene was 64.90%), and the recoveries of 16 PAHs from water samples ranged from 83.1% to 109.4%, and the relative standard deviations (RSDs) ranged from 1.2% to 9.3% (n = 6). PAHs in Dianchi Lake and Panlong River samples were quantified rapidly by this method. The results show that, the total content of these 16 PAHs is 89.16 ng/L in Dianchi Lake, 65.41 ng/L in the up-stream of Panlong River, 339.22 ng/L in the middle-stream of Panlong River and 62.25 ng/L in the down-stream of Panlong River. It is demonstrated that the Dianchi Lake and Panlong River were polluted by PAHs to some degree.
Yang
Lei
L
Yunnan Reascend Tobacco Technology (Group) Co., Ltd., Kunming 650106, China. yangbanban@126.com
Wang
Baoxing
B
Hou
Ying
Y
Yang
Yan
Y