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SPECIAL SECTION: COLLOIDS AND COLLOID-FACILITATED TRANSPORT OF CONTAMINANTS IN SOILS

Pyrene Sorption to Water-Dispersible Colloids

Effect of Solution Chemistry and Organic Matter

^a Aalborg University, Dep. of Life Sciences, Environmental Engineering Section, Sohngaardsholmsvej 57, DK-9000 Aalborg, Denmark
^b Danish Institute of Agricultural Sciences, Dep. of Agroecology, P.O. Box 50, DK-8830 Tjele, Denmark
^c Aalborg University, Dep. of Life Sciences, Chemistry Section, Sohngaardsholmsvej 57, DK-9000 Aalborg, Denmark
^* Corresponding author (mette.laegdsmand{at}agrsci.dk).

Received 9 July 2003.

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.

Abbreviations: DOC, dissolved organic C • DOM, dissolved organic matter • DW, deionized ultrapurified water • HOC, hydrophobic organic compound • PAH, polyaromatic hydrocarbon • SOM, soil organic matter • SWDC, spontaneous water-dispersible colloids • TC, total colloids • TOC, total organic C • WDC, water-dispersible colloids

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