It contains heavy metals, such as lead, and inhaling its dust can cause lung cancer.
Countries bordering the Danube have reinforced water quality controls and are monitoring the concentration of heavy metals.
The staff there performed a "challenge test" to see if Stemp's urine was positive for heavy metals.
Coal ash contains low concentrations of arsenic, mercury and other heavy metals, although it's not classified as hazardous.
Rare earth elements are a group of 17 heavy metals, which despite their name, are not particularly rare.
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It's estimated the red cloud of heavy metals is now affecting a 30km (19-mile) stretch of the River Danube.
It identified another 71 sites that it says are responsible for the leakage of heavy metals into ground water.
Use of sewage and industrially contaminated water for irrigation has drenched Punjab's soils in heavy metals and other poisons.
Electronic waste can contain toxic heavy metals and hazardous chemicals that are handled by workers, some of them children.
But a dozen studies since 2005 have found the presence of heavy metals in water to be within legal limits.
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So, there's no special consideration because there is heavy metals in it.
Over this same period concern about possible effects of exposure to environmental toxins, including pesticides and heavy metals, has become ever more pervasive.
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For the majority of the 20th century, batteries have been cylinders or rectangles containing heavy metals with little or no regard for environmental impact.
Over 1, 000 enterprises were closed down during the past two years for illegal discharge of toxic heavy metals in China, according to the government.
In fact, there is already one international agreement regulating mercury, the United Nations Protocol on Heavy Metals, which entered into force in December 2003.
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But what about the presence of heavy metals: are they dangerous?
The bike's six lithium phosphate batteries take three hours to charge and are rated for 35, 000 miles before going to wherever heavy metals go when they die.
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Less than fondly, he recalls a late-1980s visit to a French pigment factory where the air was thick with powder laced (he suspects) with toxic heavy metals.
He found high levels of poisonous heavy metals in the water and believed there was a direct connection between incidences of cancer and mining in the area.
More modern, more effective chemicals can be used in smaller quantities and are less persistent, so they disappear after a couple of weeks, while heavy metals hang around.
Environmental baselines to enable an assessment of the degree of contamination of soils and agricultural crops by heavy metals have not been established in the majority of African countries.
Officials have been able to conclude that the dolphins' deaths were not due to lack of food, interaction with fisheries, poisoning with pesticides, biotoxin poisoning or contamination by heavy metals.
Those that use photovoltaic collectors are also challenged on environmental grounds because they are manufactured using highly toxic heavy metals, explosive gases and carcinogenic solvents that present end-of-life disposal hazards.
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Before it can be released back into the nearby watercourses it has to meet stringent standards, including maximum levels of ammonia, heavy metals and any chemicals that might cause oxygen depletion.
Which BTW FYI is the most damaging to the Mitochondria, and is very efficient at depleting the Glutathione that BTW is needed to excrete the heavy metals like Mercury and vaccineal Aluminum.
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