A kinetic study on the Abiotic Methylation of Divalent Mercury in the Aqueous phase
Artikel i vetenskaplig tidskrift, 2003

The mechanism and kinetics of the formation of methylmercury from an experimental solution containing divalent mercury and acetic acid has been investigated. The experiments were performed in a 2-dm3 Teflon reactor. The organic mercury was measured with time resolutions varying between minutes and hours, after derivatisation, gas chromatography separation and Cold vapour atomic fluorescence detection. (GC)-CVAFS. CVAFS technique was used for determination of inorganic mercury in the aqueous phase using an automated mercury analyser. The experiments were carried out in concentrations relevant for natural waters. Our result shows that the reaction proceeds via mercury acetate complexes. A first order reaction coefficient has been calculated at various pH values, and was found to be (9.0±0.9)×10−7 s−1 at pH 3.6–3.7. The rate was not found to be enhanced by UV-light when taking into account the photolytical degradation of methylmercury. The reaction rate at various pH values, the influences of some other relevant reaction parameters, and implications for atmospheric and terrestrial waters are discussed.






Katarina Gårdfeldt

Göteborgs universitet

John Munthe

Dan Strömberg

Göteborgs universitet

Oliver Lindqvist

Göteborgs universitet

Science of the Total Environment

0048-9697 (ISSN)

Vol. 304 127-136


Fysikalisk kemi

Meteorologi och atmosfärforskning