Fig. 6

Spatial distribution of DG I⁻ and F⁻ concentrations (a-c is I⁻; d-f is F⁻) and isoline of groundwater depth from 2014 to 2022.
Spatial distribution of DG I⁻ and F⁻ concentrations (a-c is I⁻; d-f is F⁻) and isoline of groundwater depth from 2014 to 2022.