Metals are materials with high electrical energy, plasticity, and effulgence, which readily lose their electrons to form cations. They are naturally originated in the earthâ€™s crust and their constitutions differ amongst different geographical conditions. These metals are typically sustained the various biochemical and physiological tasks in living organisms merely in certain threshold concentrations; though they turn toxic when it exceeds the level. They are noteworthy â€˜ecological pollutantsâ€™.
Sources of heavy metals:
Anthropogenic activities such as mining, smelting, industrial smoke, corrosion, sewage sludge, use of insect or disease control agents, packaging materials, and other natural sources like ores, groundwater, and parent rock materials are considered important sources of heavy metals.
Most common metal contaminants in rice:
Arsenic and cadmium are highly toxic metals that possess a high risk of transferability to rice crops from the contaminated paddy field and thereby enter into the food chain mainly depends on metal properties, soil, and plant factors. Generally, there are three soil-plant barriers involved in reducing and limiting the entry of toxic elements into the food chain includes:
Solubility: A very trace amount of some toxic elements is being absorbed by plant roots due to their low solubility property in the soil.
Translocation: Some of the toxic elements are strongly absorbed by the roots so that the transfer of such toxic elements to plant shoots gets limited or inhibited.
Phytotoxicity: Some elements can cause toxicity to plants themselves and thus the consumption of injured crops through the food chain is very less. However, some toxic elements such as cadmium and arsenic escape from soil-plant barriers due to their comparatively high solubility property in soil and translocation ability in plants. Therefore, cadmium and arsenic are considered as the most important toxic metals that contaminate food safety via soil to food chain transfer.
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