Fibers (PDMS) Research Papers - Academia.edu (original) (raw)
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Speciation analysis by solid phase microextraction (SPME) is explored for the pesticide atrazine in an aqueous dispersion of model latex nanoparticles. It is found that the rate of extraction is governed by coupled diffusion of free and... more
Speciation analysis by solid phase microextraction (SPME) is explored for the pesticide atrazine in an aqueous dispersion of model latex nanoparticles. It is found that the rate of extraction is governed by coupled diffusion of free and particle-bound analyte towards the solid/solution interface. The nanoparticles do not enter the solid phase: the eventual equilibrium analyte concentration in the solid phase is dictated by the parti tion coefficient k wf and the concentration of the free analyte in the sample solution. The rate of release of atrazine from the latex particles is fast on the effective time scale of the microextraction process. All together, the results indicate that SPME has the potential of developing into a powerful technique for dynamic speciation analysis of organic compounds in aqueous media.