Determination of trace organic compound in water by a PDMS tube extraction coupled with thermal desorption/GC

The extraction and desorption performance of a selected polydimethylsiloxane tube coupled with thermal desorption/GC was studied by analysing trace organic compound in water samples. Under the optimum extraction and desorption conditions, the wide linear concentrations (30～1000 μg/L) and good correlation coefficients(r0.992)were achieved and the low limits of detection was bellow 3 μg/L for naphthalene, biphenyl and phenanthrene in distilled water. The recoveries of naphthalene, biphenyl and phenanthrene added in rain water (100 μg/L) were between 70 and 85%, and RSDs (n=3 ) were between 3 and 14 %. The results showed that the polydimethylsiloxane tube extraction coupled with thermal desorption-GC has the advantage of high extraction efficiency, good baseline, low analytical expense as well as simple and fast procedure.