Pyrene Sorption to Water‐Dispersible Colloids: Effect of Solution Chemistry and Organic Matter

Chemical sorption to mobile soil colloids is a controlling factor for colloid‐facilitated chemical transport in the vadose zone and groundwater. We investigated sorption of pyrene to soil colloid suspensions originating from soils differing in organic matter content for different solution chemistries. Colloids were obtained from two soils with different organic matter contents but similar geological histories by three different methods: (i) chemical dispersion, (ii) mechanical dispersion in water, and (iii) spontaneous release in water. Batch sorption experiments were conducted at five pyrene concentrations, in either pure water or at two different concentrations of K+ and Ca2+ Generally, K+ addition enhanced pyrene sorption, whereas Ca2+ addition decreased sorption. The chemically dispersed colloids exhibited the highest pyrene sorption capacity and had the most nonlinear sorption isotherms, whereas whole soil had the most linear isotherm. Model calculations of the potential amounts of leachable pyrene illustrated the importance of including both colloid‐ and dissolved organic matter (DOM)‐facilitated transport in risk assessment models when dealing with pyrene transport. The leaching potential of dissolved pyrene (with no DOM‐ and colloid‐facilitated transport) was 5% of the leaching potential when both DOM‐ and colloid‐sorbed pyrene was included.

[1]  C. Kjaergaard,et al.  Colloid Mobilization and Transport in Undisturbed Soil Columns. II. The Role of Colloid Dispersibility and Preferential Flow , 2004 .

[2]  P. Schjønning,et al.  Soil quality aspects of humid sandy loams as influenced by organic and conventional long-term management , 2002 .

[3]  Ole H. Jacobsen,et al.  Field Investigations and Modeling of Particle‐Facilitated Pesticide Transport in Macroporous Soil , 2000 .

[4]  W. Wilcke,et al.  Polycyclic aromatic hydrocarbons (PAHs) and polychlorinated biphenyls (PCBs) in particle-size separates of urban soils in Bangkok, Thailand , 2000 .

[5]  K. Jensen,et al.  Processes of colloid mobilization and transport in macroporous soil monoliths , 1999 .

[6]  M. Greve,et al.  Evaluation of World Reference Base for Soil Resources and FAO Soil Map of the World using nationwide grid soil data from Denmark , 1999 .

[7]  K. Jones,et al.  Effect of Solution Chemistry on the Extent of Binding of Phenanthrene by a Soil Humic Acid: A Comparison of Dissolved and Clay Bound Humic , 1999 .

[8]  J. Pignatello.  Soil organic matter as a nanoporous sorbent of organic pollutants , 1998 .

[9]  P. Strom,et al.  Phenanthrene binding and sorption to dissolved and to mineral-associated humic acid , 1998 .

[10]  C. T. Chiou,et al.  Partition characteristics of polycyclic aromatic hydrocarbons on soils and sediments , 1998 .

[11]  Ole H. Jacobsen,et al.  Particle transport in macropores of undisturbed soil columns , 1997 .

[12]  E. LeBoeuf,et al.  A distributed reactivity model for sorption by soils and sediments. 8. Sorbent organic domains : Discovery of a humic acid glass transition and an argument for a polymer-based model , 1997 .

[13]  D. Adriano,et al.  Mineralogical and Physicochemical Differences between Mobile and Nonmobile Colloidal Phases in Reconstructed Pedons , 1997 .

[14]  J. Pignatello,et al.  Dual-Mode Sorption of Low-Polarity Compounds in Glassy Poly(Vinyl Chloride) and Soil Organic Matter , 1997 .

[15]  J. Pignatello,et al.  Time-dependent isotherm shape of organic compounds in soil organic matter : Implications for sorption mechanism , 1996 .

[16]  C. T. Chiou,et al.  Partition of nonpolar organic pollutants from water to soil and sediment organic matters. , 1995, Environmental science & technology.

[17]  Ruben Kretzschmar,et al.  Influence of Natural Organic Matter on Colloid Transport Through Saprolite , 1995 .

[18]  J. Zachara,et al.  Interaction of hydrophobic organic compounds with mineral-bound humic substances. , 1994, Environmental science & technology.

[19]  G. H. Willis,et al.  Hysteretic Characteristics of Atrazine Adsorption-Desorption by a Sharkey Soil , 1993, Weed Science.

[20]  James J. Morgan,et al.  Effects of aqueous chemistry on the binding of polycyclic aromatic hydrocarbons by dissolved humic materials , 1993 .

[21]  W. Seitz,et al.  Effects of structural and compositional variations of dissolved humic materials on pyrene Koc values. , 1987, Environmental science & technology.

[22]  W. P. Miller,et al.  RELATIONSHIP OF SOIL DISPERSIBILITY TO INFILTRATION AND EROSION OF SOUTHEASTERN SOILS , 1986 .

[23]  J. Means,et al.  Sorption of polynuclear aromatic hydrocarbons by sediments and soils. , 1980, Environmental science & technology.

[24]  M. Schnitzer,et al.  MACROMOLECULAR STRUCTURES OF HUMIC SUBSTANCES , 1980 .

[25]  Menachem Elimelech,et al.  Mobile Subsurface Colloids and Their Role in Contaminant Transport , 1999 .

[26]  I. Kögel‐Knabner,et al.  Partitioning of polycyclic aromatic hydrocarbons to dissolved organic matter from different soils , 1998 .

[27]  W. Wilcke,et al.  PAH-pools in soils along a PAH-deposition gradient. , 1996, Environmental pollution.

[28]  S. Karickhoff,et al.  SORPTION OF HYDROPHOBIC POLLUTANTS ON NATURAL SEDIMENTS , 1979 .