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Competitive adsorption and desorption of glyphosate and phosphate on clay silicates and oxides

  • A. L. Gimsing (a1) and O. K. Borggaard (a1)


Competitive adsorption of glyphosate and phosphate on goethite and gibbsite and on illite, montmorillonite and two kaolinites differing in surface area was evaluated. The results show that glyphosate and phosphate are competing for the adsorption sites, but the degree of competition depends on the adsorbent. On goethite the competition is very much in favour of phosphate, on gibbsite the competition is closer, but still phosphate is favoured, while on illite, montmorillonite and kaolinite the competition is almost equal. The amounts of glyphosate and phosphate, which can be adsorbed also depends on the adsorbent: the oxides adsorb more than the clay silicates. The amount adsorbed on kaolinite was dependent on the specific surface area. Changes in the surface area did not affect the competition between glyphosate and phosphate for adsorption sites. The results indicate that differences among soils of different mineralogical composition regarding the adsorption of glyphosate and phosphate can be expected.


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Borggaard, O.K. (2002) Soil Chemistry in a Pedological Context, 6th edition. DSR Forlag, Royal Veterinary and Agricultural University, Copenhagen.
Borggaard, O.K., Jørgensen, S.S., Møberg, J.P. & Raben-Lange, B. (1990) Influence of organic matter on phosphate adsorption by aluminium and iron oxides in sandy soils. Journal of Soil Science, 41, 443449.
Brunauer, S., Emmet, P.H. & Teller, E. (1938) Adsorption of gases in multimolecular layers. Journal of the American Chemical Society, 62, 17231732.
Del Campillo, M.C., van der Zee, S.E.A.T.M. & Torrent, J. (1999) Modelling long-term phosphorus leaching and changes in phosphorus fertility in excessively fertilized acid sandy soils. European Journal of Soil Science, 50, 391399.
Dion, H.M., Harsh, J.B. & Hill, H.H. (2001) Competitive sorption between glyphosate and inorganic phosphate on clay minerals and low organic matter soils. Journal of Radioanalytical and Nuclear Chemistry, 249, 385390.
Fontes, M.P.F. & Weed, S.B. (1996) Phosphate adsorption by clays from Brazilian Oxisols: relationships with specifi c surfac e area and mineralogy. Geoderma, 72, 3751.
Franz, J.E., Mao, M.K. & Sikorski, J.A. (1997) Glyphosate, a Unique Global Herbicide. American Chemical Society, Washington, D.C.
Gimsing, A.L. & Borggaard, O.K. (2001) Effect of KCl and CaCl2 as background electrolytes on the competitive adsorption of glyphosate and phosphate on goethite. Clays and Clay Minerals, 49, 270275.
Glass, R.L. (1987) Adsorption of glyphosate by soils and clay minerals. Journal of Agricultural and Food Chemistry, 35, 497500.
Hance, R.J. (1976) Sorption of glyphosate by soils. Pesticide Science, 7, 363366.
He, Z.L., Yuan, K.N. & Zhu, Z.X. (1992) Effects of organic anions on phosphate adsorption and desorption from variable-charge clay minerals and soil. Pedosphere, 2, 111.
Hingston, F.J., Atkinson, R.J., Posner, A.M. & Quirk, J.P. (1968) Specific adsorption of anions on goethite. Transactions of the 9th International Congress in Soil Science, Vol. 1, Australia.
Janse, T.A.H.M., van der Wiel, P.F.A. & Kateman, G. (1983) Experimental optimization procedures in the determination of phosphate by flow-injection analysis. Analytica Chimica Acta, 155, 89102.
Lookman, R., Grobet, P., Merckx, R. & van Riemsdijk, W.H. (1997) Application of 31P and 27Al MAS NMR for phosphate speciation studies in soil and aluminium hydroxi des: promises and constra ints. Geoderma, 80, 369388.
McBride, M. & Kung, K.-H. (1989) Complexation of glyphosate and related ligands with iron(III). Journal of the Soil Science Society of America, 53, 1668–1673.
McConnel, J.S. & Hossner, L.R. (1985) pH dependent adsorption isotherms of glyphosate. Journal of Agricultural and Food Chemistry, 33, 1075–1078.
McConnel, J.S. & Hossner, L.R. (1989) X-ray diffraction and infrared spectroscopic studies of adsorbed glyphosate. Journal of Agricultural and Food Chemistry, 37, 555560.
Morillo, E., Undabeytia, T. & Maqueda, C. (1997) Adsorption of glyphosate on the clay mineral montmorillonite: Effect of Cu(II) in solution and adsorbed on the mineral. Environmental Science and Technology, 31, 3588–3592.
Nicholls, P.H. & Evans, A.A. (1991) Sorption of ionisable organic compounds by field soils. Part 2: cations, bases and zwitterions. Pesticide Science, 33, 331345.
Piccolo, A., Celano, G. & Pietramellara, G. (1992) Adsorption of the herbicide glyphosate on a metalhumic acid complex. The Science of the Total Environment, 123/124, 7782.
Piccolo, A., Celano, G., Arienzo, M. & Mirabella, A. (1994) Adsorption and desorption of glyphosate in some European soils. Journal of Environmental Science and Health, B29, 11051115.
Ruzicka, J. & Hansen, E.H. (1983) Flow Injection Analysis. Wiley, New York.
Schwertmann, U. & Cornell, R.M. (1991) Iron Oxides in the Laboratory. Preparation and Characterization. VCH Verlagsgesellschaft GmbH, Weinheim, Germany.
Slater, C. & Cohen, L. (1962) A centrifugal particle size analyzer. Journal of Scientific Instrumentation, 39, 614617.
Sprankle, P., Meggitt, W.F. & Penner, D. (1975a) Rapid inactivation of glyphosate in the soil. Weed Science, 23, 224228.
Sprankle, P., Meggitt, W.F. & Penner, D. (1975b) Adsorption, mobility, and microbial degradation of glyphosate in the soil. Weed Science, 23, 229234.
Strauss, R., Brümmer, G.W. & Barrow, N.J. (1997) Effects of crystallinity on goethite: II. Rates of sorption and desorption of phosphate. European Journal of Soil Science, 48, 1001–1014.
van der Zee, S.E.A.T.M. & van Riemsdijk, W.H. (1986) Sorption kinetics and transport of phosphate in sandy soil. Geoderma, 38, 293309.
Willet, I.R., Chartres, C.J. & Nguyen, T.T. (1988) Migration of phosphate into aggregated particles of ferrihydrite. Journal of Soil Science, 39, 275282.


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Competitive adsorption and desorption of glyphosate and phosphate on clay silicates and oxides

  • A. L. Gimsing (a1) and O. K. Borggaard (a1)


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