The environmental impacts of one of the largest tailing dam failures worldwide.

Sci Rep · 2017 · PMC5587546 · PMID 28878243

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a decreasing trendno p-value reported

Similarly to other trace elements, there was a decreasing trend for Hg EFs along the Doce River system.

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.