« back to article: Iron is not a panacea for wild rice or for our children

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“Methylmercury is produced from inorganic mercury by methylation, a microbial process that is controlled by certain bacteria and enhanced by chemical and environmental variables, such as the presence of organic matter and oxygen.” (USGS) In freshwater systems such as ours, sulfate and iron reducing bacteria (and others) function in anoxic sediments, meaning without oxygen.