TY - RPRT TI - Nonequilibrium solid-phase microextraction for determination of the freely dissolved concentration of hydrophobic organic compounds: matrix effects and limitations. AU - A G Oomen AU - P Mayer AU - J Tolls PY - 2000 DO - 10.1021/ac9914162 UR - https://pubmed.ncbi.nlm.nih.gov/10905310/ ID - 10905310 ER -