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The spatial distribution, sources, and potential ecological risk of heavy metals and metalloid were evaluated in sediments of the Wuyuer River and its tributaries. Metal and metalloid concentrations and chemical speciation (Cr, Cu, Ni, Pb, Cd, As, Zn and Hg) in 187 surface sediment samples were measured using inductively coupled plasma mass spectrometry. Metals and metalloid in the sediments of the...