Cadmium adsorption in montmorillonite as affected by glyphosate.
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.
Wang
Yu-Jun
YJ
State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China.
Zhou
Dong-Mei
DM
Luo
Xiao-San
XS
Sun
Rui-Juan
RJ
Chen
Huai-Man
HM
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
D001546:Bentonite; D002118:Calcium; D005998:Glycine; D006540:Herbicides; D014873:Water Pollutants; D000097797:Glyphosate