1. Abii TA, Okorie DO (2011) Assessment of the level of heavy metals (Cu, Pb, Cd and Cr) contamination in four popular vegetables sold in urban and rural markets of Abia State Nigeria. Continental Journal of Water, Air, and Soil Pollution 2(1):42–47
2. Ali A, Mannan A, Hussain I, Hussain I, Zi M (2018) Effective removal of metal ions from aqueous solution by silver and zinc nanoparticles functionalized cellulose: isotherm, kinetics and statistical supposition of process. Environ Nanotechnol Monit Manag 9:1–11. https://doi.org/10.1016/j.enmm.2017.11.003
3. Amalraj S (2005) Adsorption behaviour of nickel on activated carbon. IJEP 24(7):530–533
4. Anoduadi C, Okenwa O, Okieimen L, Tyowua F, A. T. & Uwumarongie, E. G. (2009) Metal immobilization in CCA contaminated soil using laterite and termite mound soil. Evaluation by chemical fractionation. Nigerian J Appl Sci 27:77–87
5. Aryal R, Beecham S, Sarkar B, Chong MN, Kinsela A, Kandasamy J (2017) Readily wash-off road dust and associated heavy metals on motorways. Water Air Soil Pollut 228:1–12. https://doi.org/10.1007/s11270-016-3178-3