Sorption and Mobility of Chlorimuron in Alabama Soils

Abstract

Soil thin-layer chromatography and a soil solution technique were used to evaluate chlorimuron adsorption and mobility in five Alabama soils. The order of adsorption was atrazine > metribuzin > chlorimuron; mobility was chlorimuron > metribuzin > atrazine. The order of adsorption of chlorimuron in the five soils was Sumter clay > Eutaw clay > Lucedale fine sandy loam > Decatur silt loam > Dothan sandy loam, and Rfvalues were 0.63, 0.73, 0.69, 0.76, and 0.80, respectively. Chlorimuron mobility and adsorption were not highly correlated to any one soil type. Adsorption of all herbicides was inversely related to soil pH. Maximum chlorimuron adsorption in the Hiwassee loam was attributed to the high hematite and gibbsite content of the soil.

Adsorption Characteristics and Influencing Factors of Chlorimuron‐Ethyl in Two Typical Chinese Soils

“…The n values of both BE and BS increased significantly afi:er the DCB treatment and nearly equal to each other. Additionally, the Krvalues of chlorimuron-ethyl obtained in this study were in che same range as che values determined for different soils reported previously (Goetz et al, 1989;Reddy et al, 1995b).…”

“…The importance of organic matter on the adsorption of chlorimuron-ethyl as well as other sulfonylurea herbicides in soil has been documented in the limited number of adsorption studies (Goetz et al, 1989;Reddy et al, 1995b;Zhang et al, 2007;Tang et al, 2009;Zanini et al, 2009). These results were mostly obtained by correlating adsorption coefficients to different soil characteristics based on a variety of soils.…”

“…The adsorption of chlorimuron-ethyl in soil has been studied since the 1980s. It has also been revealed that chlorimuron-ethyl adsorption in soil increased as soil organic matter increased and decreased with increasing pH (Goetz et al, 1989;Reddy et al, 1995aReddy et al, , 1995b. However, there have been no explicit common conclusions as for the relative contributions of a variety of soil components to the adsorption of chlorimuron-ethyl in soil.…”

Soil Sorption of Acidic Pesticides

“…Grover (1968) found that reducing soil pH from 6.5 to 5.0 reduced the bioactivity of picloram, owing to increased binding of molecular forms by organic matter. The pH‐dependence of sorption has been reported for many acidic pesticides, including bentazone (Abernathy and Wax, 1973; Grey et al, 1996), chlorimuron (Goetz et al, 1989), chlorsulfuron (Shea, 1986; Walker et al, 1989), metsulfuron‐methyl (Walker et al, 1989), and picloram (Nearpass, 1976).…”

“…Goetz et al (1989) evaluated chlorimuron sorption and mobility in Ultisols and Inceptisols, with sorption being inversely related to soil pH. Chlorimuron is a weak acid with a pK a of 4.2; therefore, anionic forms predominate in solution for most soils.…”