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Topic: Heavy metals


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In the News (Sun 19 Nov 17)

  
  Water Resource Characterization DSS - Heavy Metals
The solubility of trace metals in surface waters is predominately controlled by the water pH, the type and concentration of ligands on which the metal could adsorb, and the oxidation state of the mineral components and the redox environment of the system (Connell et al., 1984).
The behavior of metals in natural waters is a function of the substrate sediment composition, the suspended sediment composition, and the water chemistry.
The combustion of fossil fuels pollutes the atmosphere with metal particulates that eventually settle to the land surface.
www.water.ncsu.edu /watershedss/info/hmetals.html   (2391 words)

  
  Reference.com/Encyclopedia/Heavy metals
According to one definition, heavy metals are a group of elements between copper and bismuth on the periodic table of the elements—having specific gravities greater than 4.0.
In astronomy, which defines any element heavier than helium a metal, a heavy metal or heavy element includes all elements that were not formed in the big bang; all but only hydrogen (and deuterium), helium, and lithium.
Other heavy metals such as mercury, lead and cadmium (with one exception for the latter) have no known vital or beneficial effect on organisms, and their accumulation over time in the bodies of mammals can cause serious illness.
www.reference.com /browse/wiki/Heavy_metal_poisoning   (499 words)

  
  Heavy metals - Wikipedia, the free encyclopedia
According to one definition, the heavy metals are a group of elements between copper and lead on the periodic table of the elements—having atomic weights between 63.546 and 200.590 and specific gravities greater than 4.0.
Living organisms require trace amounts of some heavy metals, including cobalt, copper, manganese, molybdenum, vanadium, strontium, and zinc, but excessive levels can be detrimental to the organism.
Other heavy metals such as mercury, lead and cadmium have no known vital or beneficial effect on organisms, and their accumulation over time in the bodies of mammals can cause serious illness.
en.wikipedia.org /wiki/Heavy_metals   (283 words)

  
 Heavy Metals - Lenntech
The term heavy metal refers to any metallic chemical element that has a relatively high density and is toxic or poisonous at low concentrations.
Heavy metals can enter a water supply by industrial and consumer waste, or even from acidic rain breaking down soils and releasing heavy metals into streams, lakes, rivers, and groundwater.
Antimony is a metal used in the compound antimony trioxide, a flame retardant.
www.lenntech.com /heavy-metals.htm   (1919 words)

  
 Heavy Metals - BetterHealthGuy.com
Heavy metals is a very complex area which I am convinced is involved in many chronic health conditions.
It is important to keep in mind that the level of symptoms that metals may be causing or contributing to is related to where in the body the metals are deposited.
Doctors that are skilled in working with heavy metals will also look at the balance of minerals that appear in the test results in addition to the metals that were excreted to gauge the severity of the problem.
www.betterhealthguy.com /index.php?option=com_content&task=view&id=66&Itemid=82   (1693 words)

  
 Contaminants in the Mississippi River--Heavy Metals in the Mississippi River
The concentrations of heavy metals are controlled by the volume of the flow of the Mississippi River and are greater during the late fall and winter when freezing temperatures decrease river flow and sediment concentrations than in the spring and early summer when runoff is high.
Heavy metals are transported as (1) dissolved species in the water, (2) suspended insoluble chemical solids, or (3) components of the sus pended natural sediments.
Heavy metals are readily available to aquatic organisms and pose a significant health hazard when they are present as dissolved inorganic or organic species in the water or loosely adsorbed to particulate surfaces.
pubs.usgs.gov /circ/circ1133/heavy-metals.html   (6350 words)

  
 eMedicine - Toxicity, Heavy Metals : Article by Samara Soghoian
The classic acute occupational heavy metal toxicity is metal fume fever (MFF), a self-limiting inhalation syndrome seen in workers exposed to metal oxide fumes.
The first antidote to heavy metal poisoning, and the basis for chelation therapy today, was developed by the Germans during World War II in anticipation of a reinitiation of gas warfare.
Although ligand formation is the basis for much of the transport of heavy metals throughout the body, some metals may compete with ionized species such as calcium and zinc to move through membrane channels in the free ionic form.
www.emedicine.com /EMERG/topic237.htm   (3541 words)

  
 Safety and Health Topics: Toxic Metals
Toxic metals, including "heavy metals," are individual metals and metal compounds that negatively affect people's health.
Beryllium causes lung and skin disease in 2 to 10 percent of exposed workers.
Cadmium is an extremely toxic metal commonly found in industrial workplaces, particularly where any ore is being processed or smelted.
www.osha.gov /SLTC/metalsheavy/index.html   (360 words)

  
 heavy metals
Heavy metals weathered from natural rock formations spread widely in the environment, occurring in particulate or dissolved form in soils, rivers, lakes, seawater and sea floor sediments.
Heavy metals have long been a component of some agricultural pesticides that are sprayed on croplands and eventually find their way into rivers, lakes and coastal waters.
Some heavy metals, such as cadmium, mercury, lead and tin, may serve no particular biological function and can be toxic at relatively low concentrations, particularly in their disguised organic form.
www.bofep.org /heavy_metals.htm   (7561 words)

  
 Five Common Toxic Metals to Avoid, and Where You’ll Find Them - Articles
Heavy metal poisoning is much more common than most people realize, and if you're thinking that it doesn't apply to you because you haven't been exposed to any, think again.
Since metals build up in your body over time, symptoms are often attributed to other causes and people often don't realize that they have been affected by metals until it's too late.
Mercury is one of the most problematic of all toxic metals because, despite its dangers and known role as a neurotoxin, many people have it implanted in their mouth, injected into their bloodstream, or are consuming it daily in fish.
articles.mercola.com /sites/articles/archive/2003/12/27/toxic-metals-part-one.aspx   (2270 words)

  
 Heavy Metals are Poisonous to Birds
Acidic foods stored in copper containers may leach out copper, and occasionally copper piping for water is a potential source of increased copper in the diet if the water is slightly acidic and has been allowed to remain in contact with the piping for some length of time.
Heavy metal (eg lead or zinc) poisoning should also be considered.
Heavy metal poisoning should be considered as a reason for unexplained falls from the perch.
www.multiscope.com /hotspot/metals.htm   (671 words)

  
 Heavy metals Summary
While heavy metals such as zinc, copper, nickel, lead, arsenic, and cadmium are translocated from the soil to plants and then into the animal food chain, the concentrations in plants are usually very low and generally not considered to be an environmental problem.
The history of heavy metals toxicity is a particularly tragic one, marked by bitter conflicts over surreptitious dumping, disposal in areas populated by poor people, exposure to children, lack of equitable compensation of victims, and corporations that are unwilling or unable to pay for control and cleanup.
According to one definition, heavy metals are a group of elements between copper and bismuth on the periodic table of the elements—having specific gravities greater than 4.0.
www.bookrags.com /Heavy_metals   (5188 words)

  
 EnviroHealthAction | Toxics and Health - Heavy Metals and Health   (Site not responding. Last check: )
Sources of heavy metals in the environment include air emissions from coal-burning plants, smelters, and other industrial facilities; waste incinerators; process wastes from mining and industry; and lead in household plumbing and old house paints.
Humans are exposed to heavy metals through inhalation of air pollutants, consumption of contaminated drinking water, exposure to contaminated soils or industrial waste, or consumption of contaminated food.
Metals are particularly toxic to the sensitive, rapidly developing systems of the fetus, infants and young children.
www.envirohealthaction.org /toxics/heavy_metals   (474 words)

  
 Herbal Formula Clinically Proven To Remove Heavy Metals
Heavy Metals are becoming such a major problem today that finding a formula that removes them has always been one of my top priorities.
Studies show that heavy metals in the body may be implicated in everything from Alzheimer’s to cardiovascular disease, from behavioral problems to kidney dysfunction, Parkinson’s disease, epilepsy, and even paralysis.
Because cilantro changes the electric charge on intracellular deposits of heavy metals to a neutral state, which relaxes their tight bond to body tissue, freeing them up to be flushed from the body.
www.jonbarron.org /barron_reports/10-24-2005.php   (2782 words)

  
 Heavy Metal Toxicity: Online Reference For Health Concerns
Heavy metals are also common in industrial applications such as in the manufacture of pesticides, batteries, alloys, electroplated metal parts, textile dyes, steel, and so forth.
Heavy metals become toxic when they are not metabolized by the body and accumulate in the soft tissues.
Heavy metals may enter the human body through food, water, air, or absorption through the skin when they come in contact with humans in agriculture and in manufacturing, pharmaceutical, industrial, or residential settings.
www.lef.org /protocols/prtcl-156.shtml   (2391 words)

  
 Heavy Metals
Heavy metals are health hazards that are still not fully recognized for their ability to cause problems in the general population.
Heavy metal toxicity is well understood in acute, industrial level contamination.
There are heavy economic interests that do not want to recognize the health risks of low level heavy metals.
www.cfsn.com /metals.html   (851 words)

  
 Heavy Metals
Heavy metals are not musical, hard rock bands, but they are sometimes found in bands of hard rock.
Although heavy metals may change their chemical form in the environment, they tend to persist in one form or another, and some constitute significant environmental hazards.
This concentration as the metal is passed through natural food webs presents a special threat to the longer lived species at the top.
www.dartmouth.edu /~rpsmith/Heavy_Metals.html   (5686 words)

  
 Chemistry International
Such a classification of metals by their Lewis acidity as Class A (hard), Class B (soft), or Borderline indicates the form of bonding in their complexes, and this designation determines the possibilities for complex formation and, thus, for toxicity (Figure 1).
Even if the term heavy metal should become obsolete because it has no coherent scientific basis, there will still be a problem with the common use of the term "metal" to refer to a metal and all its compounds.
Thus, sodium metal and sodium chloride are assumed by this usage to be equivalent.
www.iupac.org /publications/ci/2001/november/heavymetals.html   (1598 words)

  
 Heavy Metals - Swedish EPA
Heavy metals are generally considered to be those whose density exceeds 5 grams per cubic centimetre.
However, metal emissions to air from Swedish industry have now been reduced to just a few per cent of levels in the 1970s, and lead emissions from road traffic have been eliminated completely.
Concentrations of heavy metals in the soil close to some large metal processing/engineering works are so high that they hamper the ability of microorganisms to break down plant matter, thus also impeding the release of nutrients from this material.
www.internat.naturvardsverket.se /documents/pollutants/metall/tungmete.html   (1320 words)

  
 Heavy atom derivatives   (Site not responding. Last check: )
Heavy atoms are very toxic, so prepare yourself before you prepare derivatives by talking to experienced colleagues and/or reading what some real experts have to say.
The class A metals typically consist of the alkali metals (Li+, Na+, K+, Rb+, Cs+), the alkaline earth metals (Mg2+, Ca2+, Sr2+, Ba2+), the lanthanides (La3+, Ce3+, Nd3+, Sm3+, Eu3+, Gd3+, Dy3+, Er3+, Lu3+) and the actinide UO2(2+).
In addition to these, several metals have a mixed class A and class B character and can be coordinated in a similar manner as the true class A metals (Tl+, Pb2+ and perhaps also cadmium).
eagle.mmid.med.ualberta.ca /tutorials/HA   (2507 words)

  
 Heavy Metals - Advanced laboratory testing will help determine levels of heavy metals
Heavy metals toxicity caused by increasing levels of pollution and use of chemicals in industry is a growing threat to our health and development of our children.
Some possible sources of heavy metals poisoning include chemical products, fertilizers, industrial paint, building materials, fish that is high in mercury, silver dental fillings, mercury presevatives in vaccines, nasal sprays, and many more.
Treatment of heavy metal exposure usually involves the removal of the heavy metal source and treatment with chelating agents.
www.greatplainslaboratory.com /metals.htm   (341 words)

  
 Relationship Between Heavy Metal Concentrations In Soils Of Taiwan And Uptake By Crops   (Site not responding. Last check: )
The bioavailable concentrations of heavy metals extracted by 0.1 M HC1 in these soils were higher than the critical levels proposed by the government, which were (per kg dry soil) 100 mg/kg for copper, 10 mg/kg for cadmium, 16 mg/kg for chromium, 100 kg/mg for nickel, 120 kg/mg for lead, and 80 mg/kg for zinc.
The maximum concentrations of heavy metals extracted with 0.1 M HCl in soils from two cities in central Taiwan are listed in Table 5.
Heavy metals may be present in one of a number of forms.
www.agnet.org /library/article/tb149.html   (5341 words)

  
 Heavy Metal Toxicity
Heavy metals are substances that are frequently ingested, inhaled or absorbed through the skin.
Heavy metals are rarely found in blood due to their toxic nature, they are quickly moved out of the blood and stored in body tissues (liver, kidney, nervous system, and other organs).
Chelation is a method where a substance is ingested to bind the heavy metals in the tissues and then the metals are pulled out of body through the stool/feces and/or urine.
www.naturalhealthcalifornia.com /Heavymetals.htm   (447 words)

  
 Heavy Metal Detox - Don't Let Heavy Metals Weigh You Down - Nature's Sunshine
These metals, which include lead, mercury, aluminum, cadmium and arsenic, are found in industrial byproducts as well as tainted drinking water, pesticides and even things as common as dental fillings and cooking utensils.
Heavy Metal Detox is a potent detoxification support product designed to bind with and remove heavy metals from the body.
Heavy Metal Detox is a unique combination of ingredients specially formulated and balanced to not only support the removal of heavy metals but also to restore the proper levels of vital minerals and nutrients in the body.
www.theherbsplace.com /heavymetal.html   (405 words)

  
 EnviroHealthAction | Children's Environmental Health - Children's Environmental Health: Toxics and Heavy Metals   (Site not responding. Last check: )
And since heavy metals are stored at concentrated levels in blood and breast milk, an adult woman's exposure can be compounded for her fetus.
Thus, a high metal concentration in a woman's body that was not harmful to her health could have negative developmental consequences for her fetus or nursing child.
Reducing exposure to heavy metals for the general population, mothers and children especially, is the best way to prevent harmful developmental effects.
www.envirohealthaction.org /children/heavy_metals   (332 words)

  
 Heavy metal - Wikipedia, the free encyclopedia
Heavy metals, chemical elements within a particular range of atomic weights
Heavy Metal (magazine), an American fantasy magazine based on the French magazine Métal Hurlant
Heavy Metal (film), a 1981 animated film based on the magazine, or its sequel Heavy Metal 2000
en.wikipedia.org /wiki/Heavy_metal   (140 words)

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