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Gerstl, Z., Institute of Soils & Water, Agricultural Research Organization, Volcani Center, Bet Dagan 50-250, Israel.
Kliger, L., Institute of Soils & Water, Agricultural Research Organization, Volcani Center, Bet Dagan 50-250, Israel.
The organic matter of several soils and sediments was extracted by a gross fractionation procedure designed to dissolve specific classes of organic compounds, and the sorption of napropamide, a nonionic herbicide, was measured on the original and extracted soils. It was found that soils contained a higher percentage of cellulose and hemicellulose materials whereas in sediments the lipid-like fraction was greater. Sorption of the test chemical was greater in the sediments, even on an organic carbon basis (Koc), than in the soils. Removal of specific fractions slightly affected the Koc of the sediments but not of the soils while acid extraction resulted in large increases in sorption by both soils and sediments; this effect was only partially reversible upon readjusting the pH. -from Authors
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Fractionation of the organic matter in soils and sediments and their contribution to the sorption of pesticides
Gerstl, Z., Institute of Soils & Water, Agricultural Research Organization, Volcani Center, Bet Dagan 50-250, Israel.
Kliger, L., Institute of Soils & Water, Agricultural Research Organization, Volcani Center, Bet Dagan 50-250, Israel.
Fractionation of the organic matter in soils and sediments and their contribution to the sorption of pesticides
The organic matter of several soils and sediments was extracted by a gross fractionation procedure designed to dissolve specific classes of organic compounds, and the sorption of napropamide, a nonionic herbicide, was measured on the original and extracted soils. It was found that soils contained a higher percentage of cellulose and hemicellulose materials whereas in sediments the lipid-like fraction was greater. Sorption of the test chemical was greater in the sediments, even on an organic carbon basis (Koc), than in the soils. Removal of specific fractions slightly affected the Koc of the sediments but not of the soils while acid extraction resulted in large increases in sorption by both soils and sediments; this effect was only partially reversible upon readjusting the pH. -from Authors
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