Solubility enhancement of PCDD/F in the presence of dissolved humic matter.

From previous studies, we, the authors collected and arranged the octanol-water partition coefficients (K(ow)), water solubility (S0), and dissolved humic matter (DHM)-water partition coefficients (K(oc)) for 95 organic compounds, and presented the correlations between each physical property. The K(oc) and K(ow) of dioxins estimated were significantly increased while S0 was decreased on increasing the chlorine number. In the presence of DHM, solubility enhancement (Sw/S0, Sw is the actual solubility in the presence of DHM) in highly chlorinated PCDD/F such as HpCDDs and OCDD is higher than that in low chlorinated ones. It means that dioxins abundant wastes (fly ash) should not be codisposed with organic abundant wastes (sewage sludge, food waste or bottom ash, etc.) to minimize the leachability of dioxins.