title: Cadmium adsorption in montmorillonite as affected by glyphosate.
abstract: Behaviors of soil heavy metals are often affected by coexisting herbicides due to their physical and chemical interaction. Effect of glyphosate, an herbicide containing -PO3(2-) and -COOH groups, on cadmium adsorption in montmorillonite was studied in detail. The results showed that the cadmium adsorption quantity in montmorillonite increased with increasing soil solution pH and cadmium concentration as usual, but decreased with glyphosate, which is due to the formation of a low affinity complex of Cd and glyphosate and decreasing solution pH induced by glyphosate addition. When the equilibrium solution pH was below 6.7, glyphosate has little effect on cadmium adsorption, but when the equilibrium solution pH was above 6.7, glyphosate significantly decreased cadmium adsorption quantity in montmorillonite. In addition, the adding order of Cd and glyphosate also influenced Cd adsorption quantity in montmorillonite.
authors.affiliation: State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China.
authors.forename: Yu-Jun
authors.initials: YJ
authors.lastname: Wang
authors.forename: Dong-Mei
authors.initials: DM
authors.lastname: Zhou
authors.forename: Xiao-San
authors.initials: XS
authors.lastname: Luo
authors.forename: Rui-Juan
authors.initials: RJ
authors.lastname: Sun
authors.forename: Huai-Man
authors.initials: HM
authors.lastname: Chen
mesh_terms: D000327:Adsorption; D001546:Bentonite / Q000737:chemistry*; D002118:Calcium / Q000737:chemistry*; D005998:Glycine / Q000031:analogs & derivatives* / Q000737:chemistry*; D006540:Herbicides / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D014873:Water Pollutants; D000097797:Glyphosate
chemical_list: D001546:Bentonite; D002118:Calcium; D005998:Glycine; D006540:Herbicides; D014873:Water Pollutants; D000097797:Glyphosate