Mobility of Prometryne in Soil As Affected by Dissolved Organic Matter

Abstract

Incorporation of organic fertilizers/amendments in soils has been, and will continue to be, a popular strategy for improving the quality of arable soils. However, the mechanism by which the dissolved organic matters (DOMs) affect soil properties or interact with other substances in soils is largely unknown. In this study, a batch equilibrium experiment was performed to evaluate the effect of two types of DOMs on the behavior of prometryne (a herbicide) in soils. Two sorts of DOMs were derived from lakebed sludge (SL) and rice straw (ST), respectively. The results show that sorption capacity in one soil for prometryne was significantly reduced by application of DOMs, whereas desorption of prometryne was promoted by DOM treatments. To understand the mobility behavior of prometryne in soils with DOMs, a column leaching experiment was carried out. It is shown that both DOMs enhanced the solubility and migration of prometryne in soils. To confirm the role of DOMs in regulating the mobility of prometryne in soils, a soil thin-layer chromatography was performed. The migration of prometryne was promoted by DOMs, which were used as a developing solvent or directly incorporated in the soil thin layer. The data indicate that DOM extracts can modify the mobility of prometryne in soil.

Adsorption of tetrabromobisphenol A on soils: Contribution of soil components and influence of soil properties

“…However, addition of exogenous DOC at the finial equilibrium concentration of 100 mg/L significantly reduced the adsorption capacity of the soil for TBBPA (12% reduction in the K f value, Table 4). DOC at high concentrations may compete for the adsorption sites in the soils, therefore inhibiting TBBPA adsorption [22]. This result suggested that transportation of TBBPA may be facilitated with the presence of high DOC in the real and complicated environment.…”

“…Peat was mixed with 0.01 M CaCl2 (solid: solution 1:10 (w:v)) and the suspension was shaken for a month. After centrifugation, the supernatant was filtered through 0.45 m membrane and the filtrate was collected DOC-added [22] using Pearson's correlation analysis and multiple linear regression analysis by SPSS 14.0.…”

Fluroxypyr biodegradation in soils by multiple factors

“…2b), suggesting that DOM was able to affect fluroxypyr dissipation. It was possible that DOM modulated microbial activities through their active organic fractions (Said-Pullicino and Gigliotti 2007;Jiang et al 2008;Song et al 2008). Therefore, addition of DOM to soils could facilitate the decay of fluroxypyr.…”

Optimization of Fenton’s oxidation of herbicide dicamba in water using response surface methodology

“…This herbicide is mainly applied for weed control, however the application does not ensure that it is safe for main crop such as sugarcane, maize etc. It was also true that very less amount is utilized by the targeted plants and major portion is retained in the soil itself (Jiang et al 2008). As a result, during the heavy rainfall the residues present in the soil can easily enter into the water body and thereby causing water pollution.…”