Kinetic signatures of metals in the presence of Suwannee River fulvic acid

Environmental Science & Technology
Jacqueline L LevyJaume Puy

Abstract

This work provides new information on the dissociation kinetics of metal-fulvic acid (FA) complexes. Diffusive gradients in thin-film (DGT) devices deployed in solutions containing metals and 30 mg L(-1) Suwannee River FA at pH 5 and 7, at two different metal-to-ligand ratios, were used to estimate an apparent diffusive boundary layer (ADBL) thickness at the gel-solution interface. The discrepancy between the ADBL thickness measured for metals that are known to dissociate from complexes quickly (e.g., Cd) and that of other trace metals was exploited to calculate the rate of complex dissociation. When the ADBL thickness is plotted for a suite of metals, a "kinetic signature" is created. There was a clear kinetic signature at pH 7, with substantial kinetic limitation for Cu, Pb, and Ni and none for Cd, Co, and Mn (i.e., Cu-, Pb-, and Ni-FA complexes dissociated more slowly). At pH 5, the kinetic signature was less distinct, due in part to slow association kinetics of Mn, and possibly Cd and Co, with the resin. The good sensitivity of the method to small changes in dissociation kinetics was able to show that the dissociation of most metal-FA complexes is sufficiently fast to not limit the DGT measurement.

References

Dec 6, 2005·Environmental Science & Technology·Herman P van LeeuwenLaura Sigg
Mar 31, 2006·Environmental Science & Technology·Laura SiggHao Zhang
Nov 24, 2006·Environmental Science & Technology·Niklas J LehtoWłodek Tych
Jun 2, 2007·Environmental Science & Technology·Kent W WarnkenJaume Puy
Oct 24, 2009·Environmental Science & Technology·Kent W WarnkenHao Zhang
May 13, 2011·Environmental Science & Technology·Sandrine MonginWilliam Davison
May 26, 2011·Environmental Science & Technology·Ramiro UribeWilliam Davison
Feb 7, 2012·Analytica Chimica Acta·Jacqueline L LevyJosep Galceran

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Citations

Aug 16, 2013·Environmental Science & Technology·Sandrine MonginJaume Puy
Jun 24, 2015·Archives of Environmental Contamination and Toxicology·Zhihao WuYuanzhi Xu
Mar 20, 2013·Environmental Science. Processes & Impacts·Anthony Stockdale, Nick D Bryan
Jan 23, 2014·Environmental Science. Processes & Impacts·Geraldine S C TurnerGary R Fones
Jun 1, 2013·Environmental Science. Processes & Impacts·Emmanuelle UherCatherine Gourlay-France
Mar 22, 2021·The Science of the Total Environment·Jordi Sans-DuñóJaume Puy
Aug 21, 2014·Environmental Science & Technology·Ruslan CusnirPascal Froidevaux
Oct 27, 2021·The Science of the Total Environment·Kevin Rosales-SegoviaJosep Galceran

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