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Constants of mercury methylation and demethylation rates in sediments and comparison of tracer and ambient mercury availability
Abstract
A method was developed to measure mercury methylation and demethylation rate constants simultaneously in aquatic samples. Solutions containing stable isotope tracers of 199Hg2+ and CH3202Hg+ were spiked into lake sediments at subambient concentrations. The formation of CH3199Hg+ and the decrease in CH3202Hg+ were measured simultaneously in time series experiments using gas chromatographic separation and isotope-specific detection by inductively coupled plasma mass spectrometry. Specific rate constants for the two processes were calculated and compared to rate constants obtained by monitoring changes in concentration of the ambient methylmercury in the same sample. The inorganic mercury tracer 199Hg2+ was methylated at a faster rate compared with the ambient inorganic Hg2+, which indicates that the added tracer Hg2+ is more available for transformation reaction than the ambient Hg2+. The degradation of tracer and ambient methylmercury proceeded at a similar rate, showing no significant differences between added tracer and ambient methylmercury. The calculated half-life for methylmercury in sediments was 1.7 d, suggesting a rapid turnover and low persistence of methylmercury in lake sediments. Different Hg species were investigated regarding their availability for methylation reactions. Compared to Hg(NO3)2, Hg-fulvate showed reduced availability and freshly precipitated HgS was hardly available.
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Citations
Cites
Sulfate stimulation of mercury methylation in freshwater sediments
Gilmour, C. C., Henry, E. A., & Mitchell, R. (1992) · Environmental Science & Technology · doi:10.1021/es00035a029 · Cited by 1,124
Cited by
Methanogens: Principal Methylators of Mercury in Lake Periphyton
Hamelin, S., Amyot, M., Barkay, T., Wang, Y., & Planas, D. (2011) · Environmental Science & Technology · doi:10.1021/es2010072 · Cited by 308
Geochemistry of Mercury in the Environment
Fitzgerald, W. F., & Lamborg, C. H. (2014) · Treatise on Geochemistry · doi:10.1016/b978-0-08-095975-7.00904-9 · Cited by 275
Marvin-DiPasquale, M., Lutz, M. A., Brigham, M. E., Krabbenhoft, D. P., Aiken, G. R., Orem, W. H., & Hall, B. D. (2009) · Environmental Science & Technology · doi:10.1021/es802698v · Cited by 162
Methylmercury Production and Accumulation in Urban Stormwater Ponds and Habitat Wetlands
Strickman, R. J., & Mitchell, C. P. J. (2017) · Environmental Pollution · doi:10.1016/j.envpol.2016.11.082 · Cited by 14
Metadata
- Authors
- Hintelmann, H., Keppel-Jones, K., & Evans, R. D.
- Venue
- Environmental Toxicology and Chemistry
- Publisher
- Oxford University Press (OUP)
- Published
- 2000-09-01
- Volume
- 19
- Issue
- 9
- Pages
- 2204-2211
- ISSN
- 0730-7268 (ISSN-L)
- 1552-8618
- OpenAlex
- W2064243478
- Cited by
- 254
- References
- 1
- FWCI
- 1.51
- Type
- journal article
- Language
- en
- Open access
- closed
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- Hintelmann, H., Keppel-Jones, K., & Evans, R. D. (2000). Constants of mercury methylation and demethylation rates in sediments and comparison of tracer and ambient mercury availability. Environmental Toxicology and Chemistry. https://doi.org/10.1002/etc.5620190909
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Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).
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