Enrichment of nitrophenols from water by means of solid-phase microextraction

The fundamental suitability of solid-phase microextraction (SPME) has been investigated for the enrichment of partially well water-soluble and differently substituted polar nitrophenols. Two commercially available fibers coated with 100 m polydimethylsiloxane or 85 m polyacrylate, respectively, were compared with regard to the efficiency of the enrichment of these compounds. For all the compounds investigated, polyacrylate fiber showed a better affinity when the exposure time was longer in comparison with polydimethylsiloxane fiber. The salting-out and the enrichment at low pH-values increased the sensitivity of the process significantly.Dedicated to Professor Dr. H. Kriegsmann on the occasion of his 70th birthday