pH-Dependent Sorption of Chlorinated Guaiacols on Estuarine Sediments:  The Effects of Humic Acids and TOC

Chlorinated guaiacols (o-methoxyphenols) are components of chlorine-bleached kraft pulp and paper mill effluents and have been detected in receiving water and sediment adjacent to paper mills. Their sorption is dependent on both solvent and sorbent characteristics. Sorption of four chlorinated guaia...

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Bibliographic Details
Published in:Environmental science & technology 1997-01, Vol.31 (1), p.188-193
Main Authors: Gundersen, Jennifer L, MacIntyre, William G, Hale, Robert C
Format: Article
Language:English
Subjects:
Applied sciences
Biological and physicochemical properties of pollutants. Interaction in the soil
Brackish
Chemistry
Contamination
environmental degradation
Exact sciences and technology
forest products
forestry
Groundwater
Pollution
pulp and paper products
Sediments
Soil and sediments pollution
waste management
Waste materials
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Summary:Chlorinated guaiacols (o-methoxyphenols) are components of chlorine-bleached kraft pulp and paper mill effluents and have been detected in receiving water and sediment adjacent to paper mills. Their sorption is dependent on both solvent and sorbent characteristics. Sorption of four chlorinated guaiacols was investigated using four estuarine sediments from the York River, VA. Sites represented several types of estuarine environments, ranging from a well-scoured sandy point to a protected tidal mudflat. Total organic carbon (TOC) contents ranged from 0.11 to 3.52% (dry weight). NaOH-extractable humic acids ranged from 0.03 to 1.2% (dry weight). Sorption coefficients, K d, were measured at pH 6.6 and pH 7.8 by the batch isotherm method. Linear relationships were observed for K d with both sediment TOC and humic acid contents. K oc and K humic, sorption coefficients normalized to % TOC and % humic acids, respectively, were calculated. Results indicated that the humic acid content of a sediment, along with TOC, is an important factor in controlling the sorption of chlorinated guaiacols. Due to differences in hydrophobicity, sorption of the protonated and deprotonated chlorinated guaiacol spe cies is expected to differ. Using accurately measured pK a values, the K d for each compound was resolved into values for the ionized and neutral species (K d,i and K d,n, respectively). The results indicated that sorption of highly chlorinated, ionized species is appreciable and cannot be discounted when assessing sorptive reactions.
ISSN:0013-936X
1520-5851
DOI:10.1021/es960304e