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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

View larger version (19K): [in a new window]   Fig. 1. Kinetics of the adsorption process using the water-dispersible colloids (WDC) suspensions of the two soils.

View larger version (26K): [in a new window]   Fig. 2. Dispersible colloids and organic matter content of three different suspensions from two soils. SWDC, spontaneous water-dispersible colloids; TC, total colloids; WDC, water-dispersible colloids.

View larger version (19K): [in a new window]   Fig. 3. The particle size distribution of the water-dispersible colloids (WDC) suspension of the depleted soil.

View larger version (29K): [in a new window]   Fig. 4. Organic C in the different suspensions (SWDC, spontaneous water-dispersible colloids; TC, total colloids; WDC, water-dispersible colloids). DOC is dissolved organic C, POC < 1 µm is the organic C bound to particles smaller than one micrometer, and POC > 1 µm is the C bound to particles larger than one micrometer.

View larger version (26K): [in a new window]   Fig. 5. Sorbed vs. dissolved pyrene concentration for the water-dispersible colloid fraction in 0.01 M CaCl2, 0.03 M KCl, and deionized ultrapurified water (DW).

View larger version (35K): [in a new window]   Fig. 6. Sorbed vs. dissolved pyrene concentration for the different suspension types (SWDC, spontaneous water-dispersible colloids; TC, total colloids; WDC, water-dispersible colloids) and whole soil in 0.01 M CaCl2. The sorbed pyrene is normalized toward organic matter.

View larger version (20K): [in a new window]   Fig. 7. Ratio between Koc,0.01 and Kow. Koc,0.01 was calculated from isotherm data according to Eq. [5] and [6], and Kow was measured on the relevant electrolytic solution. SWDC, spontaneous water-dispersible colloids; TC, total colloids; WDC, water-dispersible colloids.

View larger version (21K): [in a new window]   Fig. 8. Estimated Freundlich exponent (Na) for the three different suspensions (SWDC, spontaneous water-dispersible colloids; TC, total colloids; WDC, water-dispersible colloids) from two soils.

View larger version (22K): [in a new window]   Fig. 9. Pyrene adsorption and desorption isotherms for the water-dispersible colloids (WDC) fraction of the manured soil with 0.01 M CaCl2, 0.03 M KCl, and deionized ultrapurified water (DW).

View larger version (28K): [in a new window]   Fig. 10. Model calculations: pyrene leaching potential calculated using the scenarios listed in Table 8.