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Title: CLORANSULAM-METHYL SOIL SORPTION: EFFECTS OF ORGANIC CARBON CONTENT AND CATION EXCHANGE CAPACITY

Author
item HULTGREN, RYAN - UNIV OF ILLINOIS
item HUDSON, ROBERT - UNIV OF ILLINOIS
item SIMS, GERALD
item HASSETT, JOHN - UNIV OF ILLINOIS

Submitted to: Soil Science Society of America Annual Meeting
Publication Type: Abstract Only
Publication Acceptance Date: 6/12/1998
Publication Date: N/A
Citation: N/A

Interpretive Summary:

Technical Abstract: This study was conducted to analyze the sorption characteristics of cloransulam-methyl in 16 soils as a function of soil organic carbon content, cation exchange capacity and soil solution pH. Equilibrium sorption coefficients, Kd, ranged from 0.13 to 1.57 L kg-1. A hydrophobic partitioning model for the neutral form of the compound comparing observed Kd values with theoretical Kd values predicted from soil properties (pH, organic carbon content) suggested an incomplete representation of the soil interactions of the herbicide. A sorption model that combined hydrophobic partitioning and anion-exchange was fitted to the data. The resulting decrease in the adsorption constant of the cloransulam-methyl anion form with increasing solution pH is consistent with adsorption on soil minerals with pH-dependent surface charge.