Adsorption of Lindane onto Whole Soil and Soil Organic Fractionsby P. S. Ho, Oklahoma State Univ, Stillwater, United States,
W. F. McTernan, Oklahoma State Univ, Stillwater, United States,
Abstract: The work presented here investigated interactions of the subject pesticide with whole soil and select soil organic fractions and evaluated the commonly applied assumptions that adsorption is proportional to organic carbon content and is linear. Experiments were conducted utilizing aqueous slurries of soil and water shaken in batch reactors. The soils were subjected to various sequential treatments to dissolve specific classes of organics from their surfaces. These samples extracts were then characterized by GC/MS for molecular weight. Results from these efforts showed that adsorption was not linear and that the removal of hydrophobic materials generally increased the adsorptive capacity of the soil. This appeared to increase the wettability of the soil surface while exposing occluded surfaces. The final extraction resulted in the removal of humic material with a resultant decrease in adsorptive capacity. Comparisons of ultimate capacity and surface area indicated a linear relationship between ultimate capacity and surface area with a poorly defined relationship to either cation exchange capacity or percent organic carbon. Statistical analysis concluded that adsorption was most affected by surface area with molecular weight second. Organic carbon and cation exchange capacity while contributing to adsorption, had less significance.
Subject Headings: Adsorption | Soil water | Water pollution | Water quality | Water resources | Water supply | Soil pollution | Carbon compounds
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