Correction to: Environmental Science and Pollution Research

https://doi.org/10.1007/s11356-019-07078-7

The correct presentation of Eq. 10 is shown in this paper.

The original article was corrected.

$$ \mathsf{CAI}\hbox{--} \mathsf{2}=\left[{\mathsf{Cl}}^{-}-\left({\mathsf{Na}}^{+}+{\mathsf{K}}^{+}\right)\right]/\left({{\mathsf{HCO}}_{\mathsf{3}}}^{-}+{{\mathsf{CO}}_{\mathsf{3}}}^{\mathsf{2}-}+{{\mathsf{SO}}_{\mathsf{4}}}^{\mathsf{2}-}+{{\mathsf{NO}}_{\mathsf{3}}}^{-}\right) $$
(10)