TITLE:
Adsorption of Herbicide Butachlor in Cultivated Soils of Golestan Province, Iran
AUTHORS:
Sahar Armanpour, Liang Bing
KEYWORDS:
Butachlor, Soil, Organic Matter, Clay, Adsorption, Mobility
JOURNAL NAME:
Journal of Geoscience and Environment Protection,
Vol.3 No.3,
April
23,
2015
ABSTRACT: Butachlor is a
non-ionic herbicide that has been applied widely for agriculture, especially in
paddy fields. Through batch equilibration experiments, the adsorption
characteristics of butachlor were investigated in eight cultivated soil samples
collected from Golestan Province, Iran. The data obtained from adsorption equilibrium experiments fitted the linear equation
very well. Results showed that butachlor had weak to moderate adsorption
capability in different soils. Trend of butachlor adsorption was similar to the
order of abundance of organic carbon in the soils. The Gibbs free energy values
were found negative and adsorption was spontaneous and exothermic in nature.
Statistical analysis showed that organic carbon, CEC (cation exchange
capacity), and the Rt ratio (ratio of TNV to organic matter content) were the
more effective parameters governing butachlor retention and mobility in soils.