Extraction of heavy metals from copper tailings by ryegrass (Lolium perenne L.) with the assistance of degradable chelating agents.

The aboveground, underground and total accumulations of Cu all tended to increase first and then decrease with the heightening of CA and FA concentrations, while presented an increasing trend with the heightening of PSAP concentration (Fig. 5 a,c).

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The TF value of Cu presented a decreasing trend with the heightening of FA and PASP concentrations, which was the minimum under PASP-10 treatment, showing a significant decrease by 86.67% compared to the CK group.

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