Influence of dissolved organic matter on sorption and desorption of MCPA in ferralsol

The Science of the Total Environment
Dongming WuChunyuan Wu

Abstract

MCPA (4-chloro-2-methylphenoxyacetic acid) is an acidic herbicide, widely used in paddy fields. The presence of dissolved organic matter (DOM) modifies the sorption-desorption of herbicides in soils. In this study, effects of DOM on sorption- desorption of MCPA were tested using three typical ferralsol soil types from China: rhodic ferralsol, haplic ferralsol and paddy soil. DOM preparations were extracted from the paddy soil (DOMP), from a compost mixture of cassava stems with chicken manure (DOMC), and from rice straw (DOMR). Sorption-desorption of MCPA in the tested soil types was shown to follow pseudo first-order kinetics, and the calculated isotherm data fitted well with a Freundlich equilibrium model in the range of the studied concentrations. MCPA was weakly sorbed by the soils, producing low Freundlich coefficient values (Kf) (0.854 to 4.237). The presence of DOM reduced the Kfwhereby DOMChad the strongest and DOMRthe weakest effect. Presence of DOM also promoted MCPA desorption from the soils, again with DOMChaving the strongest effect and DOMRthe weakest. DOM coating changed the soil particle surface, as demonstrated by electron microscopy, and DOM also directly interacted with MCPA, as shown by Fourier-transform inf...Continue Reading

Citations

Oct 28, 2019·Environmental Monitoring and Assessment·Luiz Odonil Gomes Dos SantosDaniel Valadão Silva
Jan 31, 2021·International Journal of Environmental Research and Public Health·Muyesaier TudiDung Tri Phung
Feb 20, 2019·Journal of Environmental Management·Antonio López-PiñeiroSoraya Gómez

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