Abstract
The partition coefficients ( K oc) of 1,2,3,4,6,7,8-heptachlorodibenzo- p-dioxin (HpCDD) with respect to a variety of humic substances (HSs) were evaluated by a method involving solid-phase microextraction and gas chromatography–electron capture detection. The log K oc values for each of the HS samples were in the range of 6.4–7.7. The log K oc values for HAs from tropical peat, brown forest and ando soils were in the range of 7.3–7.6, similar to the calculated value for the octanol–water partition coefficient (log K oc = 7.56). In contrast, the log K oc values for FAs and peat HAs were 0.5–1 unit lower than the calculated value. The parameters for the polarity of HSs, as calculated from (N + O)/C, O/C atomic ratios and the carboxyl group content, were numerically similar related to the log K oc for HpCDD. These results show that the K oc values for HpCDD are significantly influenced by the polarity of HSs.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
