1. R. Michalski, Encyclopedia of Chromatography, 2nd ed., edited by J. Cazes. (Taylor and Francis, Oxfordshire, England, 2007).
2. C.C. Su, SM J Public Health Epidemiol. 1 (4), 1019 (2015).
3. A review of toxicity and mechanisms of individual and mixtures of heavy metals in the environment
4. European Commission, Off. J. Eur. Communities L. 330, 32 (1998).
5. World Health Organization, Guidelines for Drinking-water Quality, 4th Edition, Incorporating the 1st Addendum (World Health Organization, Geneva, Switzerland, 2017).