Adsorption of Glyphosate on Goethite (α-FeOOH): surface complexation modeling combining spectroscopic and adsorption data
2008 (English)In: Environmental Science and Technology, ISSN 0013-936X, Vol. 42, no 7, 2464-2469 p.Article in journal (Refereed) Published
N-(phosphonomethyl)glycine (glyphosate, PMG) is the most widely used herbicide, and its adsorption onto soil minerals plays a significant role in its mobility and rate of degradation. In this work, we present the results of the first serious effort to find a realistic surface complexation model that fits both adsorption and total proton concentration data for PMG on the common soil mineral, goethite. Special attention was focused on making sure that the final model was in good semiquantitative agreement with previously reported X-ray photoelectron spectroscopy and Fourier-transform infrared spectroscopic measurements. Electrostatic effects were accounted for using the Basic Stern model, and the charges of the PMG-containing surface complexes were assumed to be distributed across the 0- and β-planes. The reactions for the protonation of the goethite surface were described using the 1 pK model. We optimized on the intrinsic formation constants and the charge distributions of the complexes, as well as the initial total proton concentration (I = 0.1 M Na(NO3), 25.0 °C), and the following model was obtained.
Here, β is the intrinsic formation constant, Q0 is the charge at the 0-plane, and the errors are reported as one standard deviation. The charge distributions of the complexes are rationalized by considering intramolecular hydrogen bonding between the protons of the amine group and both the phosphonate and carboxylate groups.
Place, publisher, year, edition, pages
2008. Vol. 42, no 7, 2464-2469 p.
IdentifiersURN: urn:nbn:se:umu:diva-9528DOI: doi:10.1021/es070966bOAI: oai:DiVA.org:umu-9528DiVA: diva2:149199