Abstract
Fulvic and humic acids were isolated from living plants, dead plants and sediments of a saltmarsh estuary in the southeastern United States. Total acidity (435–605 /gmequiv H + (100 g) −1 fulvic acid and 295–385 mequiv H + (100 g) −1 humic acid), copper binding capacities (0.25-0.96 /gmequiv Cu e+ mg -1 C fulvic acid and 0.46-0.65 /gmequiv Cu 2+ mg -1 C humic acid) and benzo (a )pyrene (BaP) partitioning coefficients (log 10 K 3.48–3.86 and 4.12–4.29 for fulvic acids and humic acids, respectively) were determined and shown to be within reported ranges for fulvic and humic acids from other terrestrial and aquatic environments. Solubilities of fulvic acids, humic acids and Bal 3 varied with salt concentration, with fulvic acid being least affected by increased salinity. Ultrafiltration of natural river waters from the region showed that BaP appears to associate more with organic compounds of larger molecular size, and between-stream variation in composition of the dissolved organic carbon can significantly affect BaP binding to the organic carbon fractions of natural waters.
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