Below is a summary of the most common heavy metals, their sources and the burden they add to the human body as provided by Doctor’s Data Inc.Doctor’s Data Inc (DDI) is a premier clinical laboratory with over 30 years experience that specializes in essential and toxic elemental testing. Emissions of heavy metals to the environment occur via a wide range of processes and pathways, including to the air (e.g. The concentrations of heavy metals in the environment have increased significantly in recent decades. Heavy metals pollution is one of the environmental challenges that has over the years received increasing attention due the associated negative impacts … Keywords: Human Health, Heavy Metal, Toxicity, Exposure effects. The sources of heavy metals in food crops vary in the developing and developed world. Their presence is considered unique in the sense that it is difficult to remove them completely from the environment once they enter in it. The exceedance of various national and international standards imposed negative effects to the environment, which made the local residents face with the serious heavy metal exposure. certain heavy metals and their impact and biotoxic effects on man. INTRODUCTION Metallic elements are intrinsic components of the environment. The term has particular application to cadmium, mercury and lead, all of which appear in the World Health Organization's list of 10 chemicals of major public concern. during combustion, extraction and processing), to surface waters (via runoff … Humans can breathe in metal particles or consume metals in their food and water. Lead is a heavy metal with potentially dangerous health impacts. In order to protect the environment and human health, there is an urgent need to control and monitor the informal e-waste recycling operations. A toxic heavy metal is any relatively dense metal or metalloid that is noted for its potential toxicity, especially in environmental contexts. The heavy metal overload has inhibitory effects on the development of aquatic organisms (phytoplankton, zooplankton, and fish) [34, 35]. Ingestion of lead is especially dangerous for young children because their brains are still developing. Some metals, such as lead, cause adverse health effects. Mining, metal casting and other industrial processes contribute to metal emissions to the air. At the end of the 20th century, however, emissions of heavy metals started to decrease in developed countries: in the UK, emissions of heavy metals fell by over 50% between 1990 and 2000 1.. The metallic compounds could disturb the oxygen level and mollusks development, byssus formation, as well as reproductive processes. Environmental contaminants, food safety and security, and human health are inextricably linked. 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