Assessment of polycrystalline graphites as sorbents for solid-phase microextraction of nonionic surfactants.
Two polycrystalline graphites (pencil lead and glassy carbon) were used as sorbents for solid-phase microextraction of a nonionic alkylphenol ethoxylate surfactant (Triton X-100). Analyses were performed by reversed-phase HPLC-fluorescence detection. The presence of the benzene ring in the congeners of Triton X-100 also allowed their direct detection at lambda(ex) = 230 nm and lambda(em) = 310 nm. Variables such as time of adsorption, time of desorption and concentration of surfactant in water were evaluated. The method limit of detection was found to be 0.5 microg/l for Triton X-100, with a linear dynamic range of 0.5-150 microg/l. Results were compared to those obtained using polymeric fibers such as PDMS/DVB and Carbowax/TPR. The chemical resistance and low cost of the polycrystalline graphites are advantageous over commercially available SPME fibers.
Aranda
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R
Center for Analytical and Environmental Chemistry, Chemistry Department, Carleton University, Ottawa, ON, Canada.
Kruus
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P
Burk
R C
RC
D006108:Graphite / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning; D017830:Octoxynol / Q000737:chemistry / Q000302:isolation & purification*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D013050:Spectrometry, Fluorescence
D006108:Graphite; D017830:Octoxynol