Environmental Contamination and Food Chain Bioaccumulation

The environmental contamination and subsequent bioaccumulation of contaminants have emerged as a pressing global concern in recent times. Broadly, the environmental contaminants belong to different groups: heavy metals/metalloids, persistent organic pollutants (polycyclic aromatic hydrocarbons, polychlorinated biphenyls, dichlorodiphenyltrichloroethane, etc.) and novel “emerging contaminants” like pharmaceuticals and personal care products, radioactive elements, micro- and nanoplastics, nanomaterials, etc. The potentially toxic environmental contaminants arise from diverse sources including agricultural practices, industrial activities, improper waste disposal, urbanization, nonjudicious use of chemicals, etc. Bioaccumulation is gradual accumulation of contaminants in an organism, obtained from the ambient abiotic environment and the food chain at a rate faster than that at which they can be removed from the body. Additionally, bioconcentration refers to the uptake and retention of a substance in an organism, whereas biomagnification refers to an increase in the concentration of a contaminant along the successive trophic level in a food chain. Bioaccumulation occurs through various pathways as pollutants enter the food chain through runoffs, industrial discharges, domestic sewage, etc. Continuous human exposure to toxic contaminants can lead to chronic health problems including cancer, nervous disorders, hormonal imbalances, digestive dysfunction, mutations, etc. Environmental contaminants have detrimental effects on ecosystems and biodiversity as well. Improving waste management, conducting regular risk assessment and monitoring, promoting awareness, adopting sustainable practices such as bioremediation techniques, and implementing policy measures are essential steps in mitigating environmental contaminantion, thus providing safer food and safeguarding the environment and human health.