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Research article - Peer-reviewed, 2016

Silver(I) Binding Properties of Organic Soil Materials Are Different from Those of Isolated Humic Substances

Berggren Kleja, Dan; Nakata, Satomi; Gustafsson, Jon-Petter; Nakata, Satomi; Persson, Ingmar; Gustafsson, Jon Petter

Abstract

The solubility of silver(I) in many soils is controlled by complexation reactions with organic matter. In this work we have compared the ability of isolated humic and fulvic acids to bind silver(I) with that of mor and peat materials. One new data set for Suwannee River Fulvic Acid was produced, which was consistent with published data sets for isolated fulvic and humic acids. The ability of soil materials to bind silver(I) was studied as a function of pH in the range 2.5-5.0, at a wide range of silver(I)-to-soil ratios (10(-4.2) - 10(-1.9) mol kg(-1)). By calibrating the Stockholm Humic Model on the humic and fulvic acids data sets, we showed that binding of silver(I) to both types of soil materials was much stronger (up to 2 orders of magnitude) than predicted from the silver(I) binding properties of the isolated humic materials. Thus, the approach taken for many other metals, that is, to model solubility in soils by using metal and proton binding parameters derived from isolated humic and fulvic acids, cannot be used for silver(I). One possible explanation for the discrepancy could be that silver(I) predominately interacted with various biomolecules in the soil samples, instead of humic- and fulvic-acid type materials.

Keywords

silver, soils, complexation, mobility in natural systems

Published in

Environmental Science and Technology
2016, volume: 50, number: 14, pages: 7453-7460

Authors' information

Swedish University of Agricultural Sciences, Department of Soil and Environment
Swedish Geotechnical Institute (SGI)
Nakata, Satomi (Nakata, Satomi)
Swedish University of Agricultural Sciences, Department of Soil and Environment
Nakata, Satomi (Nakata, Satomi)
Kyoto Institute of Technology
Swedish University of Agricultural Sciences, Department of Soil and Environment
Gustafsson, Jon Petter (Gustafsson, Jon-Petter)
Royal Institute of Technology (KTH)
Swedish University of Agricultural Sciences, The Department of Chemistry and Biotechnology

UKÄ Subject classification

Geochemistry

Publication Identifiers

DOI: https://doi.org/10.1021/acs.est.6b00970

URI (permanent link to this page)

https://res.slu.se/id/publ/77037