Adsorption-desorption and leaching potential of glyphosate and aminomethylphosphonic acid in acidic Malaysian soil amended with cow dung and rice husk ash

• Published in: Environmental monitoring and assessment 2018-11, Vol.190 (11), p.676-15, Article 676
• Main Authors: Garba, Jamilu, Samsuri, Abd Wahid, Othman, Radziah, Ahmad Hamdani, Muhammad Saiful
• Format: Article
• Language: English
• Subjects: Acidic oxides; Acidic soils; Adsorption; Adsorptivity; Animals; Ashes; Atmospheric Protection/Air Quality Control/Air Pollution; Cattle; Cattle manure; Control; Desorption; Dung; Earth and Environmental Science; Ecology; Ecotoxicology; Environment; Environmental Management; Environmental monitoring; Environmental Monitoring - methods; Environmental science; Glycine - analogs & derivatives; Glycine - chemistry; Glyphosate; Groundwater; Herbicides; Herbicides - analysis; Isoxazoles - chemistry; Leaching; Mobility; Monitoring/Environmental Analysis; Oryza; Oxide minerals; Removal; Rice; Soil; Soil - chemistry; Soil amendment; Soil investigations; Soil Pollutants - analysis; Tetrazoles - chemistry
• ISSN: 0167-6369; 1573-2959
• DOI: 10.1007/s10661-018-7034-3

This study investigates adsorption-desorption and the leaching potential of glyphosate and aminomethylphosphonic acid (AMPA) in control and amended—addition of cow dung or rice husk ash—acidic Malaysian soil with high oxide mineral content. The addition of cow dung or rice husk ash increased the adsorptive removal of AMPA. The isotherm data of glyphosate and AMPA best fitted the Freundlich model. The constant K f for glyphosate was high in the control soil (544.873 mg g −1 ) followed by soil with cow dung (482.451 mg g −1 ) then soil with rice husk ash (418.539 mg g −1 ). However, for AMPA, soil with cow dung was high (166.636 mg g −1 ) followed by soil with rice husk ash (137.570 mg g −1 ) then the control soil (48.446 mg g −1 ). The 1/ n values for both glyphosate and AMPA adsorptions were