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The increasing anthropogenic inputs of Pb and Cd into China’s Nen River (Qiqihar section) owing to rapid urbanization in the past 50 years may pose ecological risks to the river’s aquatic system. To confirm this hypothesis, we determined the Pb and Cd concentrations in the sediments of the Nen River flowing across Qiqihar City by comparing the control group (samplings in the Nen River branch bypassing...
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