Research on heavy metals focuses on their sources, environmental behavior, toxic effects, and methods for monitoring and remediation. Heavy metals such as lead, mercury, cadmium, arsenic, chromium, nickel, and copper occur naturally in rocks and soils, but human activities have greatly increased their release. Mining, metal smelting, coal combustion, industrial production, waste incineration, traffic emissions, and the use of fertilizers and pesticides are major contributors to contamination of air, water, and soils.

These elements do not degrade and can accumulate in sediments, plants, animals, and ultimately humans. Many are essential in trace amounts but become harmful at higher concentrations. Toxic effects include damage to the nervous system, kidneys, liver, cardiovascular system, and development in children. Some, such as cadmium, chromium VI, and arsenic, are recognized or suspected carcinogens.

A key research area is understanding how heavy metals move and change form in the environment. Their mobility and bioavailability depend on factors like pH, organic matter, redox conditions, and the presence of other ions. Another emphasis is on measuring contamination using chemical analysis of water, soil, air particulates, and biological samples. Biomonitoring with plants, lichens, and animal tissues helps track long term exposure.

Remediation research explores techniques to remove or immobilize metals, including chemical treatments, soil washing, stabilization, and the use of plants and microorganisms to extract or transform contaminants. Current work also examines combined exposure to multiple metals, interactions with microplastics and organic pollutants, and the implications for food safety, public health, and environmental regulation.