Summary
Sediments of the rivers Rhine and Yssel and sewage sludge samples showed high mercury contents (5–30 ppm). Usually less than 1% — in one sludge sample 5% — of the mercury was in the form of methylmercury. Incubation of these samples, under varied aerobic and anaerobic conditions, with or without HgCl2 or phenylmercuryacetate added, gave no or only very slight formation of methylmercury.
Most agricultural soils have a mercury content below 0.1 ppm and methylation will be no problem.
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van Faassen, H.G. Methylation of mercury compounds in soil, sediment and sewage-sludge samples. Plant Soil 44, 505–509 (1976). https://doi.org/10.1007/BF00015908
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DOI: https://doi.org/10.1007/BF00015908