Economic and Environmental Geology

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Fig. 2.

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Fig. 2. Extraction ratio of the heavy metals with the studied single extraction methods over aqua regia (AR) extraction. Refer to the text for each symbol.
Econ. Environ. Geol. 2021;54:259-69 https://doi.org/10.9719/EEG.2021.54.2.259
© 2021 Econ. Environ. Geol.