PJB-2019-638
BIOACCUMULATION AND TRANSLOCATION FACTOR OF HEAVY METALS IN RICE CROP: AN ASSESSMENT FOR HUMAN HEALTH, REGARDING METAL TOXICITY
Zafar Iqbal Khan
Abstract
The current research work was undertaken in Jhang, Pakistan to investigate and evaluate the level of heavy metals in Oryza sativa variety, Super Kernel. The samples were collected from five different sites of Moza Satiana Chiniot Road, Jhang. The mean level of heavy metals (mg kg-1) in grains was present in the order of Mn> Ni Fe˃ Cd˃ Co˃ Zn˃ Cu at five investigated sites. Metal bioavailability and accessibility to plants were confirmed by the presence of toxic metals in different parts of the studied crop (root, shoot and grains). Except for Cd, concentrations of all metals under investigation were within safe limits. The values of pollution load index for all metals were less than 1 except for Cd. Bioaccumulation factor and translocation factor for all studied metals were found less than 1 at all sites. Enrichment coefficient of Co and Cd was higher in comparison to other studied metals. Level of a health risk index for all investigated metals were (<1) except Zn but its value was within safe limits. Continuous irrigation with canal water contaminated with fertilizers, city effluent and industrial discharge could bring the levels of these noxious metals to highly toxic levels indicating potential threats to public health.
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