The concentration and chemical speciation of typical metals (Cu, Zn, Cd, Pb, Cr, As, Mn, Fe) in water andsediment were investigated from the upstream of the Pearl River. The investigated eight metals showed thetotal As, Cu and Pb concentrations of most sample sites in the sediment exceeded the threshold effectconcentration of sediment quality guidelines, but their potential ecological risk index values were low, whichposed a low risk to the local ecosystem. The speciation of Pb and Zn showed that they predominate in thereducible fractions; Cu and As were mainly held in residual fraction and reducible fraction. The order ofbioavailability for the metals was Mn > Zn > Pb > As > Cu > Fe > Cr.
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