Till sidans topp

Sidansvarig: Webbredaktion
Sidan uppdaterades: 2012-09-11 15:12

Tipsa en vän
Utskriftsversion

Adsorption of glyphosate … - Göteborgs universitet Till startsida
Webbkarta
Till innehåll Läs mer om hur kakor används på gu.se

Adsorption of glyphosate on goethite (alpha-FeOOH): Surface complexation modeling combining spectroscopic and adsorption data

Artikel i vetenskaplig tidskrift
Författare Caroline Jonsson
P. Persson
S. Sjoberg
J. S. Loring
Publicerad i Environmental Science & Technology
Volym 42
Nummer/häfte 7
Sidor 2464-2469
ISSN 0013-936X
Publiceringsår 2008
Publicerad vid Institutionen för kemi
Sidor 2464-2469
Språk en
Ämnesord SOLID-SOLUTION INTERFACE, COMPETITIVE ADSORPTION, AGED GAMMA-AL2O3, ION, ADSORPTION, WATER, ACID, (HYDR)OXIDES, PHOSPHATE, COADSORPTION, PHOSPHONATES
Ämneskategorier Yt- och kolloidkemi, Koordinationskemi, Lösningskemi

Sammanfattning

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 O- and beta-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 (l = 0.1 M Na(NO3), 25.0 degrees C), and the following model was obtained. FeOH0.5- + H3L reversible arrow FeHL1.5- +H++H2O Log10 beta = 4.70 +/- 0.08, Q(0) = -0.18 +/- 0.02 FeOH0.5- + H3L reversible arrow FeL2.5- + 2H(+) + H2O Log(10) beta = -3.9 +/- 0. 1, Q(0) = -0.7 +/- 0.1 Here, beta is the intrinsic formation constant, Q(0) 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.

Sidansvarig: Webbredaktion|Sidan uppdaterades: 2012-09-11
Dela:

På Göteborgs universitet använder vi kakor (cookies) för att webbplatsen ska fungera på ett bra sätt för dig. Genom att surfa vidare godkänner du att vi använder kakor.  Vad är kakor?