Lead Lead is a bluish-white lustrous metal.
What are the impacts of mercury on the environment? The source document for this Digest states: A very important factor in the impacts of mercury to the environment is its ability to build up in organisms and up along the food chain.
Although all forms of mercury can accumulate to some degree, methylmercury is absorbed and accumulates to a greater extent than other forms. Inorganic mercury can also be absorbed, but is generally taken up at a slower rate and with lower efficiency than is methylmercury.
The biomagnification of methylmercury has a most significant influence on the impact on animals and humans. Fish appear to bind methylmercury strongly, nearly percent of mercury that bioaccumulates in predator fish is methylmercury.
Most of the methylmercury in fish tissue is covalently bound to protein sulfhydryl groups. This binding results in a long half-life for elimination about two years.
As a consequence, there is a selective enrichment of methylmercury relative to inorganic mercury as one moves from one trophic level to the next higher trophic level. Bioaccumulation and biomagnification The term bioaccumulation refers to the net accumulation over time of metals within an organism from both biotic other organisms and abiotic soil, air, and water sources.
The term biomagnification refers to the progressive build up of some heavy metals and some other persistent substances by successive trophic levels — meaning that it relates to the concentration ratio in a tissue of a predator organism as compared to that in its prey AMAP, In contrast to other mercury compounds the elimination of methylmercury from fish is very slow.
Given steady environmental concentrationsmercury concentrations in individuals of a given fish species tend to increase with age as a result of the slow elimination of methylmercury and increased intake due to changes in trophic position that often occur as fish grow to larger sizes i.
Therefore, older fish typically have higher mercury concentrations in the tissues than younger fish of the same species. The mercury concentrations are lowest in the smaller, non-predatory fish and can increase many-fold on the way up the food chain. Apart from the concentration in food, other factors affect the bioaccumulation of mercury.
Of most importance are the rates of methylation and demethylation by mercury methylating bacteria e. When all of these factors are combined, the net methylation rate can strongly influence the amount of methylmercury that is produced and available for accumulation and retention by aquatic organisms.
As described in chapter 2, several parameters in the aquatic environment influence the methylation of mercury and thereby its biomagnification. While much is generally known about mercury bioaccumulation and biomagnification, the process is extremely complex and involves complicated biogeochemical cycling and ecological interactions.
At the top levels of the aquatic food web are fish-eating species, such as humans, seabirds, seals and otters. The larger wildlife species such as eagles, seals prey on fish that are also predators, such as trout and salmon, whereas smaller fish-eating wildlife such as kingfishers tend to feed on the smaller forage fish.
In a study of fur-bearing animals in Wisconsin, the species with the highest tissue levels of mercury were otter and mink, which are top mammalian predators in the aquatic food chain.
Top avian predators of aquatic food chains include raptors such as the osprey and bald eagle. Aquatic food webs tend to have more levels than terrestrial webs, where wildlife predators rarely feed on each other, and therefore the aquatic biomagnification typically reaches higher values.Lead (U.S.
Environmental Protection Agency) - Learn about lead, what it is, where it is found, the potential health effects, and what to do to limit your exposure. Enviro-Health Links - Lead and Human Health (National Library of Medicine) - Resources on basic information, regulations, and health impacts of lead.
Lead and lead compounds have been used in a wide variety of products found in and around our homes, including paint, ceramics, pipes and plumbing materials, solders, gasoline, batteries, ammunition, and cosmetics. Lead may enter the environment from these past and current uses. Health and environmental effects of mercury Human health The three most common forms of mercury (elemental, inorganic and methylmercury) can all produce adverse health effects at .
Reported sources of heavy metals in the environment include geogenic, industrial, agricultural, pharmaceutical, domestic effluents, and atmospheric sources. Environmental pollution is very prominent in point source areas such as mining, foundries and smelters, and .
Facts about lead and its human effects Lead is a useful and common metal that has been used by humans for thousands of years. It is also a very dangerous poison, particularly for children, when it is accidentally inhaled or ingested.
Cadmium also consists in the industries as an inevitable by-product of zinc, lead and copper extraction.
After being applied it enters the environment mainly through the ground, because it is found in manures and pesticides.