Determination of polycyclic aromatic hydrocarbons in surface water using large volume stir bar sorptive extraction coupled with thermal desorption-gas chromatography-mass spectrometry

doi:10.3724/SP.J.1123.2016.11013

Abstract

Abstract:

A fast and sensitive analytical method for the ultra trace determination of 16 kinds of polycyclic aromatic hydrocarbons (PAHs) in surface water based on stir bar sorptive extraction (SBSE) coupled with gas chromatography-mass spectrometry was established. Multiple stir bars simultaneous enrichment with sequential cryofocusing and merged injection technique was used to effectively solve the problem of long adsorption time and small sample volume with SBSE. The conditions of thermal desorption time, cryofocusing temperature of cooled injection system (CIS), CIS desorption time and extraction time were investigated. Under the optimized conditions, the results showed that the linear range was between 0.2 ng/L and 10 ng/L (naphthalene, 0.5-10 ng/L), and the method detection limits (MDLs) of the 16 PAHs ranged from 0.03 ng/L to 0.20 ng/L (naphthalene, 0.50 ng/L). The 11 PAHs were determined in the Qiantang River surface water samples, and the contents were between 0.13 ng/L and 1.57 ng/L. The recoveries of the 16 PAHs spiked in surface water samples at different levels were between 75.6% and 108.9%. The method can be efficiently applied to the determination of PAHs.

Key words: gas chromatography-mass spectrometry (GC-MS), polycyclic aromatic hydrocarbons (PAHs), stir bar sorptive extraction (SBSE), surface water, thermal desorption (TD)

CLC Number:

O658

FENG Li, ZHANG Shengjun, ZHU Guohua, LI Mufei, LIU Jinsong. Determination of polycyclic aromatic hydrocarbons in surface water using large volume stir bar sorptive extraction coupled with thermal desorption-gas chromatography-mass spectrometry[J]. Chinese Journal of Chromatography, 2017, 35(4): 466-471.

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