Analytical Sciences

Solid-Phase Microextraction for the Evaluation of Partition Coefficients of a Chlorinated Dioxin and Hexachlorobenzene into Humic Substances

Hikaru YABUTA, Masami FUKUSHIMA, Fumiko TANAKA, Hiroyasu ICHIKAWA, and Kenji TATSUMI

National Institute of Advanced Industrial Science and Technology (AIST), Onogawa 16-1, Tsukuba-West, Tsukuba 305-8569, Japan

We developed a method for the evaluation of the partition coefficients (K_oc) of hexachlorobenzene (HCB) and 1,2,3,4,6,7,8-heptachlorodibenzo-p-dioxin (HpCDD) into humic substances (HSs) by using solid-phase microextraction (SPME). In the aqueous solution containing HCB or HpCDD and HS, the unbound species of HCB or HpCDD were accumulated on the SPME fiber. Subsequently, HCB or HpCDD on the SPME fiber was directly analyzed by GC-ECD. When the concentration of organic carbon in HS ([OC]) was plotted against the ratio of [HCB] or [HpCDD] in the absence of HS to that in the presence of HS, linear relationships were observed. The slope of the line corresponded to the K_oc value. The log K_oc values for HCB and HpCDD evaluated were in the ranges of 3.9 - 4.9 and 5.9 - 7.2, respectively. These values were the same order as those in the literature, which were evaluated by other methods (e.g., solubility enhancement, solid-phase extraction and dialysis). The relative standard deviations of the log K_oc values evaluated in this study were within 5%.

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