Glyphosate adsorption in soils compared to herbicides replaced with the introduction of glyphosate resistant crops

Adsorption of glyphosate in a forest soil: a study using Mössbauer and FT-IR spectroscopy

“…The lower concentrations of P total, the higher concentrations of P available, higher pH and the higher values of MSC in the soils of farm area when compared to the soils of forest reserve could be used to explain why the bands at 1075 and 1100 cm -1 were not observed. Therefore, GPS may not be adsorbed by metals (Fe 3+ , Al 3+ ) in forest reserve soil because the adsorption sites are occupied by phosphate, and as observed by Mamy and Barriuso, 11 Wang et al 12 and Gimsing et al 13 pre-sorbed phosphate on soils suppresses adsorption of GPS. A study of the adsorption of GPS and PO 4 3-as well as the GPS/ Fe 3+ and PO 4 3-/Fe 3+ complexes in soils of the Londrina area farm and forest reserve was undertaken by Mössbauer spectroscopy to better understand this process.…”

“…[4][5][6][7][11][12][13]16,32,42 They found that the GPS phosphonate group interacts with metals, and in some cases, amine and/or carboxylic groups also interact with metals. Thus, forest reserve soil samples should also show an FT-IR band due to the interaction of metals (Fe…”

“…14 Because GPS remains as an anionic charged molecular structure in soils it tends to be more efficiently adsorbed on the surface of positively charged mineral particles than any other neutral or positively charged chemical. 6,11 However, this interaction of GPS and surface metal cations can be the cause of many reported environmental problems. Zhou et al 15 and Wang et al 16 observed that GPS influences decreasing the adsorption of Cd and Zn by soils, respectively.…”

“…2 There are several studies showing that the retention of GPS in soils depends on the cation exchange capacity (CEC) 3 of the occurring minerals, clay content, 3 organic matter, [5][6][7] and iron and aluminum oxides. [8][9][10][11][12][13] However, there is no agreement about the most important factors that control the adsorption of GPS.…”

Fate of Pesticides in Soils: Toward an Integrated Approach of Influential Factors

“…In general, the adsorption of pesticides increases with the volume and with the degree of branching which is correlated to the surface area (Mamy & Barriuso, 2005;Sabljic et al, 1995). Indeed, the molecular volume is related to water solubility (see hydrophilic/hydrophobic balance) (Calvet, 1989), and the degree of branching encodes the intermolecular accessibility (Kier & Hall, 2000).…”