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Factors Controlling Sorption of Prosulfuron by Variable-Charge Soils and Model Sorbents

Seunghun Hyuna,b and Linda S. Leea,*

a Department of Agronomy, Purdue University, West Lafayette, IN 47907-2054
b School of Civil Engineering, Purdue University, West Lafayette, IN 47907-2051



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  		Fig. 1. Correlation between the fraction of hydrophilic prosulfuron sorption (fhydrophilic) and the ratio of the absolute value of anion exchange capacity (AEC, cmol kg–1) to cation exchange capacity (CEC, cmol kg–1) at the pH of the prosulfuron isotherm study. The line is a linear regression fit set to intercept zero and r2 is the associated goodness of fit. Soils include four highly weathered subsurface Oxisols (A1, A2, A3, and DRC) collected from Brazil, three subsurface Andisols (K1, K2, and K3) from South Korea, two weathered surface Ultisols (4R and 8R) from Costa Rica, and one moderately weathered surface Alfisol (Toronto) from Indiana.

 


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  		Fig. 2. pH dependence on the prosulfuron sorption coefficient (Kd, L kg–1) measured from CaCl2 and Ca(H2PO4)2 solutions (A and B), and the fraction of hydrophilic and hydrophobic prosulfuron sorption (C and D) for the highly weathered subsurface Oxisols A1 and DRC. The terms Kd (Cl) and Kd (P) noted in the legend refer to Kd values measured from 5 mM CaCl2 and Ca(H2PO4)2, respectively.

 


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  		Fig. 3. Log Koc (L kg–1 organic carbon [OC]) of prosulfuron as a function of pH collected from this study (open circles) and for 18 soils from Hultgren (2000)(closed triangles). The solid line is log Koc as a function of pH estimated by weighted combination of two log Koc values of neutral and ionized species for commercial humic acid measured in this study.

 




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