Comparison of adsorbents for on-line solid-phase extraction of polycyclic aromatic hydrocarbons before liquid chromatography with UV detection
Date
2002
Authors
Chen, Z.
Mallavarapu, M.
Naidu, R.
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Journal article
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Chromatographia, 2002; 56(1-2):105-108
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On-line solid phase extraction (SPE) coupled with reversed-phase liquid chromatography and UV detection at 254 nm has been used for the determination of trace-level polycyclic aromatic hydrocarbons (PAH) in soil extracts. Five commercially available adsorbents (C<inf>8</inf>, C<inf>18</inf>, PLRP-S, PRP-1, and Bond-Elut Env) were evaluated. Results showed that recovery of the PAH decreased with increasing molecular weight, because of their poorer solubility Recovery of high-molecular-weight PAH was significantly improved by addition of 10% (v/v) acetonitrile to the sample before loading of the SPE adsorbent. PAH recovery ranged from 64.0 to 108% when a 50 mL sample spiked with 1 μg L<sup>-1</sup> was applied to these adsorbents. Determination of PAH was possible with detection limits below 0.05 μg L<sup>-1</sup> which corresponds to 0.2 μg kg<sup>-1</sup> soil. The method was successfully used to determine PAH in soil extracts.
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