[Determining mole ratio of monomers in new adsorbent of solid-phase microextraction by infrared spectroscopy]

In the present paper, butyl acrylate and phenylethylene were used as monomers, benzoyl peroxide as evocator, n-butyl acetate and methylbenzene as solvent, a new type of solid-phase micro extraction adsorbent that is phenylethylene-butyl acrylate copolymer was synthesized by solution polymerization. The polymer has good behaviour for adsorbing arenas. According to Lambert-Beer law and some calculation process, the linear relation between the absorptance (y) of the two functional groups, which are benzene and ester, and the two monomers' mole ratio (x) was obtained. The absorptances were determined by IR. The standard curve was obtained by external standard method. The linear regression equation is y = 0.1362 + 0.0841x. The precisions and recoveries were investigated. RSD is 2.464%, and recoveries are 92.89%-103.94%. The results are satisfactory. This method is rapid and accurate.