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In comparison, severe heavy metal and rock pollution of the sediments associated with Diaojiang River Basin is seen. Even in the reduced reaches, remote from the mining location, the content of Pb, Zn, As and Cd when you look at the sediments is still two instructions of magnitude higher than the earth background values. The content of both Cd so that as presents a rather large ecological danger, showing that underneath the collective effectation of high geological back ground values and mining
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