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A heavy metal is a member of an ill-defined subset of elements that exhibit metallic properties, which would mainly include the transition metals, some metalloids, lanthanides, and actinides. Many different definitions have been proposed—some based on density, some on atomic number or atomic weight, and some on chemical properties or toxicity. The term heavy metal has been called "meaningless and misleading" in an IUPAC technical report due to the contradictory definitions and its lack of a "coherent scientific basis".John H. Duffus ""Heavy metals" a meaningless term? (IUPAC Technical Report)" Pure and Applied Chemistry, 2002, Vol. 74, pp. 793-807. doi: 10.1351/pac200274050793 There is an alternative term toxic metal, for which no consensus of exact definition exists either. As discussed below, depending on context, heavy metal can include elements lighter than carbon and can exclude some of the heaviest metals. One source defines "heavy metal" as "... common transition metals, such as copper, lead, and zinc. These metals are a cause of environmental pollution (heavy-metal pollution) from a number of sources, including lead in petrol, industrial effluents, and leaching of metal ions from the soil into lakes and rivers by acid rain."

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Wikipedia about heavy metals

A heavy metal is a member of an ill-defined subset of elements that exhibit metallic properties, which would mainly include the transition metals, some metalloids, lanthanides, and actinides. Many different definitions have been proposed—some based on density, some on atomic number or atomic weight, and some on chemical properties or toxicity. The term heavy metal has been called "meaningless and misleading" in an IUPAC technical report due to the contradictory definitions and its lack of a "coherent scientific basis".John H. Duffus ""Heavy metals" a meaningless term? (IUPAC Technical Report)" Pure and Applied Chemistry, 2002, Vol. 74, pp. 793-807. doi: 10.1351/pac200274050793 There is an alternative term toxic metal, for which no consensus of exact definition exists either. As discussed below, depending on context, heavy metal can include elements lighter than carbon and can exclude some of the heaviest metals. One source defines "heavy metal" as "... common transition metals, such as copper, lead, and zinc. These metals are a cause of environmental pollution (heavy-metal pollution) from a number of sources, including lead in petrol, industrial effluents, and leaching of metal ions from the soil into lakes and rivers by acid rain."

Relationship to living organisms

Living organisms require varying amounts of "heavy metals." Iron, cobalt, copper, manganese, molybdenum, and zinc are required by humans. Excessive levels can be detrimental to the organism. Other heavy metals such as mercury, plutonium, and lead are toxic metals that have no known vital or beneficial effect on organisms, and their accumulation over time in the bodies of animals can cause serious illness. Certain elements that are normally toxic are, for certain organisms or under certain conditions, beneficial. Examples include vanadium, tungsten, and even cadmium.

Heavy metal pollution

Heavy metal pollution can arise from many sources but most commonly arises from the purification of metals, e.g., the smelting of ores and the preparation of nuclear fuels. Electroplating is the primary source of chromium and cadmium. Through precipitation of their compounds or by ion exchange into soils and muds, heavy metal pollutants can localize and lay dormant. Unlike organic pollutants, heavy metals do not decay and thus pose a different kind of challenge for remediation.

A well documented environmental disaster associated with heavy metals is the Minamata disease caused by mercury pollution.

In medicine

In medical usage, heavy metals are loosely defined and include all toxic metals irrespective of their atomic weight: "heavy metal poisoning" can possibly include excessive amounts of iron, manganese, aluminium, or beryllium (the fourth lightest element) or such a semimetal as arsenic. This definition excludes bismuth, the heaviest of stable elements, because of its low toxicity.

Search results for Heavy Metals

Water Resource Characterization DSS - Heavy Metals

Watershed-Scale Decision Support System for managing Nonpoint Source Pollution ... Although most heavy metal do not pose a threat to humans through crop ...www.water.ncsu.edu/watershedss/info/hmetals.html

HEAVY METAL TOXICOLOGY - Dr. Theodore B. Hoekman

The first rational antidote to heavy metal intoxication was developed during World War II in anticipation of a re ... of heavy metals we generally ...www.hbci.com/~wenonah/hydro/heavmet.htm

eMedicine - Toxicity, Heavy Metals : Article by Samara Soghoian

Some debate exists as to exactly what constitutes a heavy metal and which elements should properly be classified as such. Some authors have based the definition on ...www.emedicine.com/EMERG/topic237.htm

Heavy Metals Test

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Heavy Metals Inc. - Find parts suppliers in Eastern Iowa!

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News about Heavy Metals

Emerging Markets Report: Financial avalanche hits Iceland amid global credit crisis

Market WatchA financial avalanche is hitting Iceland’s tiny economy, as the bill from years of heavy borrowing has come due amid the global credit crisis, leading to a tumble in the currency and distress in the banking system. http://www.marketwatch.com/enf/rss.asp?guid=%7BE3664C74-C084...

Market overview: FTSE 100 down 25

ShareCast via Yahoo! UK & Ireland Finance1220: Footsie is in the red again having see-sawed either side of the zero mark after recovering from this morning's heavy slump. HBOS, down 16%, leads the fallers. RBS is also lower. On a mixed day for the mining sector Vedanta and Kazakhmys are down in line with lower metals prices, but Xstrata is going strong after heavy falls yesterday. Interdealer broker ICAP, also a heavy faller yesterday .....http://uk.biz.yahoo.com/080930/214/i7q4b.html

Recession, deflation fears spark freefall ahead of jobs, House rescue vote

SmallCapInvestor.com via Yahoo! Finance The Russell 2000 shed 33.92, or 5.05%, to 637.67, the lowest daily close in nearly three years.http://biz.yahoo.com/smallcapinvestor/081002/11252.html?.v=1

Waste Management, Sony team for electronic recycling event

BizJournalsWaste Management Inc. and Sony Electronics Inc. are rolling out an electronic recycling event Oct. 18 at the University of Phoenix Stadium in Glendale.http://www.bizjournals.com/phoenix/stories/2008/09/29/daily6...

Gold, Silver prices down

New KeralaMumbai, Oct 1: The precious metals, after the three-day upward march, today declined heavily with Silver nosediving by Rs 710 per kg and Gold by Rs 210 per ten gm on lower buying support along with discouraging global advice, traders at the Bombay Bullion Association said.http://www.newkerala.com/topstory-fullnews-28355.html

News about Heavy Metals

Ask Pablo

SalonIn addition to any embalming chemicals introduced, our bodies contain so many chemicals and heavy metals that they can be considered hazardous waste under many definitions.http://www.salon.com/env/ask_pablo/2008/08/11/ask_pablo_buri...

Divestment Urged on CFIs

ScoopThe riverine system of mine waste tailings disposal is now banned in most parts of the world because the sediments containing heavy metals cause ecological devastation.http://www.scoop.co.nz/stories/WO0809/S00194.htm

Court Hears First Appeals Motion in DuPont Spelter Case

The State JournalTheir original lawsuit claims DuPont contaminated soil in the community with heavy metals and carcinogens from a local smelter operation. The other two appeals to be heard will be filed by DuPont.http://www.statejournal.com/story.cfm?func=viewstory&storyid...

Cyanide gold-mining ban challenged in Colo. court

Forbes ... Summit County, said local officials are concerned about a repeat of the Summitville gold mine disaster, when a 17-mile stretch of the Alamosa River was rendered lifeless after a containment basin failed, releasing water tainted with heavy metals.http://www.forbes.com/feeds/ap/2008/09/09/ap5405633.html

Gold drops as dollar hits year high, oil falls

ForbesWe've had heavy commodity-wide selling today, including precious metals," said James Steel, precious metals analyst at HSBC (nyse: HBC - news - people ) in New York.http://www.forbes.com/reuters/feeds/reuters/2008/09/10/2008-...

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Heavy Metals Inc. - Find parts suppliers in Eastern Iowa!

Find local machine shops and machining related job shop suppliers by specialty easy with HeavyMetalsInc.com, the online machine job shop services network.http://heavymetalsinc.com

Heavy-Metal Toxicity

Did you know some people think Toxic Heavy Metals cause autism, and other disorders? Detoxifying from these heavy metals can be crucial if you have them built up in your body.http://heavy-metals.com

Heavy-Metal.de

Deutsches Heavy-Metal Magazin im Internet mit Interviews, Reviews, Konzertberichten, Bandpages uvm.http://www.heavy-metal.de/?id=8019

Heavy Metal - Death Metal - Thrash Metal - Black Metal - Best Heavy ...

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Heavy Metal Mfg.

We have had great response from ipod and stasher/lighter buckles to our new bad ass jewelry line. All these new exiting products will be up very soon so remember to please ... http://heavymetalbuckles.com/
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Answers for Heavy Metals

julidyn b

what are the differences of a live algae and dead algae in absorbing heavy metals?pls!?

julidyn basdfghjkl
ramanarayana

how the heavy metals are removed from waste water using chemical coagulation?

ramanarayanaHere are two methods I pulled from the web: The 1st is using a clay flocullant, which caused the heavy metals to ppt ref: http://www.wastechengineering.com/products/heavy_metal_removal.pdf Th...
signum-crusis

How can you use yeast as a filtration agent for heavy metals?

signum-crusisIf I am reading this correctly, you have a patent (IP, intellectual property) on using yeast to filter out heavy metals in water, but you don't know how it works. I find that rather amusing. Word ...
Robert M Mrok (Gloom)

What is the chance to find heavy metals (like uranium) resources outside the Earth?

Robert M Mrok (Gloom)Probably not. But I'm sure there are metals out there that we don't have on earth, some of which could be even more effective at uses we use minerals for today. Just curious, why did you pick uran...
ann g

does any one know what heavy metals in well water can do to your liver? I have been dx with pbc stage 2 and I?

ann gShort- or Long-term: EPA has found mercury to potentially cause the following health effects when people are exposed to it at levels above the MCL for relatively short periods of time: kidney damage ...

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