Determination Of Alkylphenols In River Water Using Etched Stainless Steel Wire/Ionic Liquid Solid Phase Microextraction

Alkylphenols (APs) are ubiquitous environmental contaminants arising from degradation of alkylphenol polyethoxylates (APnEOs). APs possess lipophilic property, bioaccumulation and estrogenic effect, they are stable in environment. The increased awareness of the presence of APs in the environment has led to researchers’ intensified interest in the trace analysis of these compounds. In order to overcome the disadvantages of traditional methods such as liquid-liquid extraction; solid-phase extraction et al, in this study, we prepared a solid phase microextraction{SPME} coating based on ionic liquid (ILs) for analyzing APs from water samples. The experimental data validated that the etched stainless steel wire was a suitable substrate for SPME, because etched stainless steel wire kept strong mechanical strength and simultaneously adsorbed much ILs. The coating film was prepared by directly depositing ILs onto the surface of etched stainless steel wire which exhibited porous structure and high surface area. The parameters which affect the extraction efficiency were studied and optimized.[C8MIM][PF6] ILs gave maximum efficiency when extraction time of30min, and the aqueous sample was40℃and adjusted at pH2under the stirring conditions. The optimized method was applied to extraction of four APs in water, the enrichment factor of the ILs coating to the four APs were higher that of the commercial polyacrylate (PA) fiber, and the R.S.D. for a double distilled water spiked with APs were4-18%(n=3). The optimized method was successfully applied to analyze real water samples and the method was suitable for extraction APs from water samples.