Assessment ecological risk of heavy metal caused by high-intensity land reclamation in Bohai Bay, China.

PLoS One · 2017 · PMC5397030 · PMID 28422982

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an increasing trendno p-value reported

[ 21 ] collected surface soil from four chronological sequences of wetlands in the Yellow River Delta of China and found an increasing trend for Pb, Cu, and Zn along the wetland-forming chronosequence although their pollution levels were low.

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