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Heavy metals play essential roles in biological activities as enzyme cofactors in trace amounts. However, their significance is overshadowed by potential harm in excess. Bio-accumulation, toxicity, non-biodegradability, and persistence are hallmarks that impact the environment and human health. Bio-accumulation is critical as metals accumulate in organisms, posing risks in ecosystems, especially in the food chain. This leads to elevated metal concentrations in the human food chain. Even at trace levels, heavy metals like lead, mercury, cadmium, chromium, and arsenic exhibit toxicity, causing various health issues, emphasizing the need to regulate exposure. Non-biodegradability distinguishes heavy metals; they persist in the environment, enhancing the risks associated with prolonged exposure and accumulation. Due to their recognized toxicity, heavy metals are a focus of research. Understanding sources, pathways, and effects is crucial for effective mitigation strategies. Researchers explore pollution control, improved industrial practices, and remediation techniques. Anthropogenic activities, such as industrialization, urbanization, waste disposal, and agricultural practices, release heavy metals into the environment. This contaminates air, water, and soil, contributing to environmental and health risks. The present paper discusses the sources and toxicological effects of various heavy metals.
V. N. Meena Devi (Wed,) studied this question.