BINDING OF ORGANIC POLLUTANTS TO HUMIC AND FULVIC ACIDS: INFLUENCE OF pH AND THE STRUCTURE OF HUMIC MATERIAL

摘要

In order to compare their binding capacities, humic acids (HA) and fulvic acids (FA) were isolated from water and extracted from sediments, and used to measure partition coefficients (K_oc) for the model compounds benzo(a)pyrene (BaP) and pentachlorophenol (PCP). To study the effect of pH on the binding capacity of humic substances, K_oc values were measured at pH 5.0, 6.5 and 8.0. An equilibrium dialysis method was used to determine the K_oc and elemental analysis, ~(13)C-NMR and FT-IR spectra were carried out on HA and FA to examine the relationship between the structure of humic material and the partition coefficients.