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Effect of Dissolved Organic Matter in Treated Effluents on Sorption of Atrazine and Prometryn by Soils

Dep. of Agronomy, Purdue Univ., West Lafayette, IN 47907-1150 USA

View larger version (19K): [in a new window]   Fig. 1 Association of pesticides to DOM from municipal waste effluent (MW), swine effluent (SW), and Aldrich humic acid (HA). DOM concentrations were as follows: 136 mg OC/L for MW, 320 mg/L for SW, and 690 mg OC/L for HA. Lines represent linear regressions with zero intercepts

View larger version (16K): [in a new window]   Fig. 2 Sorption of DOM from municipal waste effluent (MW), swine effluent (SW), and Aldrich humic acid (HA) by Drummer (DR) and Bloomfield (BF) soils. Initial DOM concentrations applied to DR were 110 mg OC/L for MW, 300 mg OC/L for SW, and 440 mg OC/L for HA, and 84 mg OC/L of HA was applied to BF

View larger version (21K): [in a new window]   Fig. 3 Sorption of pesticide by Drummer (DR) and Bloomfield (BF) soils in the presence and absence of DOM from different sources. Numbers in parentheses are DOM concentrations in mg OC/L, and lines are Eq. [3] predictions

View larger version (48K): [in a new window]   Fig. 4 Equation [3] estimates for the minimium DOCo concentrations needed to produce a 2% decrease in pesticide sorption, i.e., KSi,DOC 0.98 fSOCKSOCi for values of KD (fSOC* KSOCi) < 20 L/kg (upper graph); and for a case where KD (fSOC* KSOCi) is near unity, KSDOC = 0 and KDOCi = 100 and 200 (lower graph)