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第 1期刘文民等:溶胶凝胶法制备固相微萃取搅拌棒 94
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Prepara tion of Solid Pha se on Stir Bar for
Sorptive Extraction by Sol GelM ethod
L iu W enm in, W ang Hanwen, Guan Yafeng
(Dalian Institute of Chem ical Physics, Chinese Academ y of Sciences, D alian 116012)
Abstract A sol gel coating method for the p reparation of coating film on bars used in sorp tive m icroextraction
is described. The poly ( dimethysiloane) ( PDMS) is partially crosslinked with the sol work, and the
most part is entangled within work. Three step aging temperatures are app lied for the sol gel coating
layer to avoid caking of the film. The thickness of extraction phase is 30μm, and can be increased by way of
multi coating. The extraction phase p repared by using the imp roved coating technology shows good thermal
stability up to 300℃. The analyses of sp iked aqueous samp les containing n alkanes or polyaromatic hydrocar
bons were carried out by using the sorp tive