To the top

Page Manager: Webmaster
Last update: 9/11/2012 3:13 PM

Tell a friend about this page
Print version

Dimethylmercury Formation… - University of Gothenburg, Sweden Till startsida
Sitemap
To content Read more about how we use cookies on gu.se

Dimethylmercury Formation Mediated by Inorganic and Organic Reduced Sulfur Surfaces

Journal article
Authors Sofi Jonsson
N. M. Mazrui
R. P. Mason
Published in Scientific Reports
Volume 6
ISSN 2045-2322
Publication year 2016
Published at Centre for Environment and Sustainability
Language en
Links dx.doi.org/10.1038/srep27958
Subject categories Geochemistry, Organic Chemistry

Abstract

Underlying formation pathways of dimethylmercury ((CH3)2Hg) in the ocean are unknown. Early work proposed reactions of inorganic Hg (Hg II) with methyl cobalamin or of dissolved monomethylmercury (CH3Hg) with hydrogen sulfide as possible bacterial mediated or abiotic pathways. A significant fraction (up to 90%) of CH3Hg in natural waters is however adsorbed to reduced sulfur groups on mineral or organic surfaces. We show that binding of CH3Hg to such reactive sites facilitates the formation of (CH3)2 Hg by degradation of the adsorbed CH3Hg. We demonstrate that the reaction can be mediated by different sulfide minerals, as well as by dithiols suggesting that e.g. reduced sulfur groups on mineral particles or on protein surfaces could mediate the reaction. The observed fraction of CH3Hg methylated on sulfide mineral surfaces exceeded previously observed methylation rates of CH3Hg to (CH3)2 Hg in seawaters and we suggest the pathway demonstrated here could account for much of the (CH3)2 Hg found in the ocean.

Page Manager: Webmaster|Last update: 9/11/2012
Share:

The University of Gothenburg uses cookies to provide you with the best possible user experience. By continuing on this website, you approve of our use of cookies.  What are cookies?