Kananke, T.; Wansapala, J.; Gunaratne, A. Pb and Cr Contaminations of Irrigation Water, Soils and Green Leafy Vegetables Collected from Different Areas of Colombo District, Sri Lanka. Pak. J. Nutr. 2015, 14 (9), 593–602. https://doi.org/10.3923/pjn.2015.593.602.