HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Abstract Full Text Free Full Text (PDF) Free Alert me when this article is cited Alert me if a correction is posted Services Related articles in JEQ Similar articles in this journal Similar articles in ISI Web of Science Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via ISI Web of Science (3) Citing Articles via Google Scholar Google Scholar Articles by Hur, J. Articles by Schlautman, M. A. Search for Related Content PubMed PubMed Citation Articles by Hur, J. Articles by Schlautman, M. A. GeoRef GeoRef Citation Agricola Articles by Hur, J. Articles by Schlautman, M. A. Related Collections Humic Substances Other Contaminants Organic Compounds Soil Pollution

Effects of Mineral Surfaces on Pyrene Partitioning to Well-Characterized Humic Substances

^a Department of Environmental Engineering & Science and Department of Geological Sciences, School of the Environment, Clemson University, Clemson, SC 29634-0919
^b Institute of Environmental Toxicology, Clemson University, Pendleton, SC 29670

View larger version (32K): [in a new window]   Fig. 1. Humic substance (HS) adsorption isotherms on minerals: (a) different HS on kaolinite, (b) different HS on hematite, (c) purified Aldrich humic acid (PAHA) ultrafiltration (UF) fractions on kaolinite, and (d) PAHA UF fractions on hematite. Adsorption experiments were performed at pH 7 and 0.1 M NaCl in duplicate or triplicate. Error bars for some data points are smaller than the symbols. The solid lines represent the respective Langmuir model fits to the data.

View larger version (14K): [in a new window]   Fig. 2. Correlations between Langmuir adsorption parameters (pH 7, 0.1 M NaCl) and log weight-average molecular weight (MWw) for purified Aldrich humic acid (PAHA) ultrafiltration (UF) fractions and different humic substances (HS) on kaolinite: (a) maximum adsorption density and (b) Langmuir adsorption constant. Error bars for some data points are smaller than the symbols.

View larger version (14K): [in a new window]   Fig. 3. Correlations between Langmuir adsorption parameters (pH 7, 0.1 M NaCl) and log weight-average molecular weight (MWw) for purified Aldrich humic acid (PAHA) ultrafiltration (UF) fractions and different humic substances (HS) on hematite: (a) maximum adsorption density and (b) Langmuir adsorption constant. Error bars for some data points are smaller than the symbols.

View larger version (36K): [in a new window]   Fig. 4. Comparison of pyrene Koc values at pH 4 and 0.1 M NaCl for dissolved and mineral-bound humic substances (HS): (a) different HS and (b) purified Aldrich humic acid (PAHA) ultrafiltration (UF) fractions. Dissolved HS data are from Hur and Schlautman (2003a).

View larger version (23K): [in a new window]   Fig. 5. Correlations between pyrene log Koc values (pH 4, 0.1 M NaCl) and log MWw for dissolved and mineral-bound (, •: kaolinite; , : hematite) humic substances (HS): (a) different HS and (b) purified Aldrich humic acid (PAHA) ultrafiltration (UF) fractions.

View larger version (18K): [in a new window]   Fig. 6. Comparison of measured and predicted purified Aldrich humic acid (PAHA) sorption isotherms on kaolinite (top) and hematite (bottom). The predicted isotherms were calculated based on ideal competitive and noncompetitive Langmuir adsorption models using the Langmuir adsorption parameters in Table 2 for each PAHA ultrafiltration (UF) fraction.