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Topic: Lead (element)


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In the News (Tue 20 Aug 19)

  
  lead, chemical element. The Columbia Encyclopedia, Sixth Edition. 2001-05
Although lead is seldom found uncombined in nature, its compounds are widely distributed throughout the world, principally in the ores galena, cerussite, and anglesite.
Lead is used for covering cables and as a lining for laboratory sinks, tanks, and the “chambers” in the lead-chamber process for the manufacture of sulfuric acid.
Although lead and most of its compounds are only slightly soluble in water, the use of lead pipe to carry drinking water is dangerous, since lead is a cumulative poison that is not excreted from the body (see lead poisoning).
www.bartleby.com /65/le/lead.html   (661 words)

  
  LEAD POISONING - LoveToKnow Article on LEAD POISONING   (Site not responding. Last check: 2007-10-13)
Lead enters the body chiefly through the nose and mouth, being inspired in the form of dust or swallowed with food eaten with unwashed hands.
Fritting the lead means mixing it with the other ingredients of the glaze beforehand and fusing them all together under great heat into a kind of rough glass, which is then ground to make the glaze.
However, the bulk of the manufacturers agreed to give up the use of raw lead, and to fritt all their glazes in future, time being allowed to effect the change of process; but they declined to be bound to any particular composition of glaze for the reasons indicated.
11.1911encyclopedia.org /L/LE/LEAD_POISONING.htm   (1280 words)

  
 ELEMENT: LEAD
White lead, the basic carbonate, sublimed white lead, chrome yellow, and other lead compounds are used extensively in paints, although in recent years the use of lead in paints has been drastically curtailed to eliminate or reduce health hazards.
Lead oxide is used in producing fine "crystal glass" and "flint glass" of a high index of refraction for achromatic lenses.
Lead salts such as lead arsenate have been used as insecticides, but their use in recent years has been practically eliminated in favor of less harmful organic compounds.
www.radiochemistry.org /periodictable/elements/82.html   (399 words)

  
 Lead: The Toxic Element
Lead obtains the atomic 82 and is a very dense and heavy metal used primarily in construction and battery manufacturing.
Lead is one of the elements frequently found in small proportions in the earth's crust and measures to a very high level of toxicity.
Lead is said to be one of the first metals to be produced or extracted by man. Lead was popular in the ancient societies of Rome, Greece, and countries near Egypt.
www.kn.att.com /wired/fil/pages/listleadwe.html   (2034 words)

  
 Mineral Information Institute - LEAD
Lead: Used in lead batteries, gasoline tanks, and solders, seals or bearings, used in electrical and electronic applications, TV tubes, TV glass, construction, communications, and protective coatings, in ballast or weights, ceramics or crystal glass, tubes or containers, type metal, foil or wire, X-ray and gamma radiation shielding, soundproofing material in construction industry, and ammunition.
Combined with other elements, it forms a variety of interesting and beautiful minerals, all of which are heavy due to their lead content.
Lead is also imported into the United States from a number of countries, both as ore concentrates and as metallic lead.
www.mii.org /Minerals/photolead.html   (625 words)

  
 PubH5105:Lead Abatement and Policy
Specifically, lead poisoning is attributed to a widespread decline in mental capacity that resulted in accelerated societal decline and subsequent collapse of the massive empire.
Lead continues to be used in a wide variety of industries and products because it prevents corrosion, is long lasting, resists cracking due to heat and cold, kills mold and mildew, and blocks radiation.
Lead is the perfect element for deposition in tissue because the body mistakes it for calcium, an element that is used for countless mechanisms in the human body.
enhs.umn.edu /5105/lead/leadintro.html   (1173 words)

  
 NATIVE LEAD (Pb)
Lead is extremely rare as a mineral, though the element itself somewhat common.
The element lead is found in the Earth's crust in concentration of about 13 parts per billion.
Not exactly the most common element, however as a very important metal it is fortunate that lead often conentrates itself in ore bodies of galena, cerussite, anglesite and minium.
mineral.galleries.com /minerals/elements/lead/lead.htm   (237 words)

  
 It's Elemental - The Element Lead
Most lead is obtained by roasting galena in hot air, although nearly one third of the lead used in the United States is obtained through recycling efforts.
Lead is also used as a covering on some wires and cables to protect them from corrosion, as a material to absorb vibrations and sounds and in the manufacture of ammunition.
Lead monoxide (PbO), also known as litharge, is a yellow solid that is used to make some types of glass, such as lead crystal and flint glass, in the vulcanizing of rubber and as a paint pigment.
education.jlab.org /itselemental/ele082.html   (480 words)

  
 Lead (Element)   (Site not responding. Last check: 2007-10-13)
The alchemists believed lead is the oldest metal and associated it with the planet Saturn.
Lead is mainly obtained from galena by a roasting process.
Back in the time of Romans emperor, they used lead as drain in baths that had their emblem on them are still in use today.
www.tamuk.edu /chemistry/WebElements/lead_element.htm   (109 words)

  
 lead - Hutchinson encyclopedia article about lead   (Site not responding. Last check: 2007-10-13)
Lead is the softest and weakest of the commonly used metals, with a low melting point;; it is a poor conductor of electricity and resists acid corrosion.
As a cumulative poison, lead enters the body from lead water pipes, lead-based paints, and leaded petrol.
(In humans, exposure to lead shortly after birth is associated with impaired mental health between the ages of two and four.) The metal is an effective shield against radiation and is used in batteries, glass, ceramics, and alloys such as pewter and solder.
encyclopedia.farlex.com /lead   (336 words)

  
 CRB Fundamentals
Lead is a dense, toxic, bluish-gray metallic element, and is the heaviest stable element.
Lead is used in building construction, bullets and shot, tank and pipe lining, storage batteries, and electric cable sheathing.
Lead is used extensively as a protective shielding for radioactive material, i.e., X-ray apparatus, because of its high density and nuclear properties.
www.crbtrader.com /fund/articles/lead.asp   (616 words)

  
 ACS :: Lead
Lead is a naturally occurring bluish-gray metal found in small amounts in the earth’s crust.
Lead harms the peripheral nerves causing weakness and sensory disturbances.
Lead is carcinogenic in animals, and there is some evidence of carcinogenicity in humans.
www.cancer.org /docroot/PED/content/PED_1_3X_Lead.asp?sitearea=PED   (2578 words)

  
 Lead (element) - Ganfyd
Lead (element) in N Eng J Med, Lancet, JAMA, BMJ from Pubmed
Lead compounds were used in paint in households in at least the 19th century in the UK, and may be exposed by sanding and other decorating or construction work.
Elemental lead should not be confused with 'lead' in pencils which is made from carbon (graphite).
www.ganfyd.org /index.php?title=Pb   (274 words)

  
 Lead Poisoning: From Beethoven to Ducks
It is unclear what the source of Beethoven's lead poisoning was—it could have been his drinking water, his food, or the utensils with which he ate.
Lead is a heavy metal once used widely in many products, such as paint, gasoline, and food containers.
Lead is thought to account for half the deaths among the common loon populations in New England and around the Great Lakes.
www.riverdeep.net /current/2000/11/110800_lead.jhtml   (1499 words)

  
 398th Bomb Group Combat Formations
This Basic Element Formation was really the most tedious and perhaps dangerous formation position to fly, be the Element in the Squadron or Group formation, because of the close operating distances and the reliance of the "other guy" to do his job reasonably well.
If a pilot was selected to be a lead, he flew fewer missions, due the vulnerability of the lead position in the formation, and his crew had to fly only the number of missions he did.
The deputy lead always flew on the right wing of the lead and was prepared to assume the lead role responsibility in an emergency.
www.398th.org /Research/Formations/Formations_Description.html   (2215 words)

  
 Lead Poisoning, NIEHS Kids Page Hot Topics
Lead may also be found in the soil next to homes that previously had been painted with lead-based paint.
In addition, lead may be present in old toys, some imported toys, lead-glazed or lead-painted pottery, leaded crystal, and some inks, plasters, hobby and sports materials (such as artists' paints, ammunition, stained glass treatments, or lead sinkers used in fishing).
These figures reflect the major sources of lead exposure: deteriorated paint in older housing, and dust and soil that are contaminated with lead from old paint and from past emissions of leaded gasoline.
www.niehs.nih.gov /kids/lead.htm   (818 words)

  
 ABC 7 News - Lead Air Pollution Limits Might Be Dropped   (Site not responding. Last check: 2007-10-13)
The Bush administration is considering doing away with health standards that cut lead from gasoline, widely regarded as one of the nation's biggest clean-air accomplishments.
Lead is one of six air pollutants the EPA is required to review every five years to make sure the health limits are protective enough.
In July, a Washington-based trade group for all U.S. lead battery makers wrote a top EPA air quality official to urge that the agency remove lead from its list of air pollutants.
www.wjla.com /news/stories/1206/378145.html   (693 words)

  
 The Element Lead   (Site not responding. Last check: 2007-10-13)
All of these elements are solid, have a relatively high density and are opaque.
Lead was discovered was discovered in Ancient times and used by the ancient Egyptians, Greeks, Romans and Chinese.
Check out Lead on the Periodic Table which arranges each chemical element according to its atomic number, as based on the periodic law, so that chemical elements with similar properties are in the same column.
www.periodic-table.org.uk /element-lead.htm   (298 words)

  
 Pb = Lead - a Toxic Element
At the time lead was eliminated from gasoline, close to 80% of all children had levels of lead that would exceed today’s federal safety limit of 10 micrograms per deciliter of blood.
Lead exposure in young children results primarily from ingestion or inhalation of soil particles, drinking water, paint, and dust particles in and around the home and play areas.
The lower the pH of the water and the lower the concentration of dissolved salts in the water, the greater is the solubility of lead in the water.
www.luminet.net /~wenonah/hydro/pb.htm   (4703 words)

  
 Lead The Element   (Site not responding. Last check: 2007-10-13)
Lead is a mjaor constituent of the lead acid battery used extensively in car batteries.
Lead is ued as a coloring element in ceramic glazes notably in the coolrs red and yellow.
Lead is used as national program to in eliminate the lead in gasoline.
ld.worflume.com /lead-the-element.html   (536 words)

  
 Lead point for helical earth anchor (US4996806)
A lead element is provided for use with an earth anchor including an elongated rod and an anchor member having a longitudinal hub provided with first and second axial ends and presenting a bore extending axially therethrough, and an outwardly extending load-bearing element affixed to the hub.
The lead element includes a first end portion adapted to extend into the bore of the hub to connect with the elongated rod, and a ground-engaging end portion disposed remote from the first end portion and including an offset tip for penetrating earth contacted by the lead element.
an earth engaging lead element depending from one of the axial ends of the hub, the lead element including a flange sized to retain the hub on the elongated rod, rotation of the load-bearing element about the longitudinal axis defining a second circular area concentric with and greater than the first circular area,
www.delphion.com /details?pn10=US04996806   (430 words)

  
 Lead Generation Consulting
Lead generation is a key element of your overall lead management process.
Depending on your resources and objectives, I can oversee the entire lead generation vendor selection process--from creating the short list of qualified lead generation companies, to writing the RFP, to negotiating favorable agreements, to managing the set up and implementation of your outsourced programs.
I'll analyze your entire lead generation process: lead generation; inquiry handling or response management; nurturing of prospects; identifying qualified sales; and "closing the loop" by tracking results.
www.sales-lead-experts.com /consulting/lead-generation-services.cfm   (642 words)

  
 Operation Pointblank
Once the BG lead Element launches they will continue on Runway Heading and level at 1000 feet, for 1 minute then will turn right to the reciprocal Heading and fly back to the Airfield.
The Remaining Elements will cut off the Lead element in the turn and assume their formation position.
Except for the drop commands all commands are acknowledged with a "cc" to their respective element leads, then element leads will "cc" to their group leads.
www.ischool.berkeley.edu /~fredrik/cuda/Scenarios/pointblank/8th/sop_bg-8.html   (347 words)

  
 Periodic Table : Scholar edition: lead : The Essentials
What follows is a brief description of lead.
Lead pipes bearing the insignia of Roman emperors, used as drains from the baths, are still in service.
Lead isotopes are the end products of each of the three series of naturally occurring radioactive elements.
www.webelements.com /webelements/scholar/elements/lead/key.html   (164 words)

  
 Lead-Free Pewter
Unlike base-metal alloys that contain lead (Pb), which are mixed with other elements but not chemically combined, the lead oxide used in leaded glass production is a lead compound (PbO).
Lead oxide therefore does not react with the body in the same way as metallic lead (Pb) might.
Despite the fact that leaded glass crystal is not hazardous to the cutter or user, Swarovski® has recently developed lead-free crystals that make rainbows almost as well as the traditional leaded glass crystals.
www.rings-things.com /LEAD.HTM   (653 words)

  
 LEAD CAN BE DANGEROUS - about the element lead
The element lead is used as lead nitrate, lead acid, lead poison.
Seeking out sources of lead in the household and surrounding areas can be crucial in safeguarding your family members, especially children and pets.
Also, people who may have been exposed to lead or lead dust recently should have the lead levels in their blood tested by their doctor or local health department.
www.vienna.cc /networld/report_element_lead_acid.htm   (819 words)

  
 Lead air pollution limits might be dropped | KOMO 1000 News Radio - News, Weather and Sports - Seattle, WA Seattle, ...
WASHINGTON (AP) - The Bush administration is considering doing away with health standards that cut lead from gasoline, widely regarded as one of the nation's biggest clean-air accomplishments.
Battery makers, lead smelters, refiners all have lobbied the administration to do away with the Clean Air Act limits.
Soon after lead was listed as an air pollutant 30 years ago, the Carter administration began removing lead from gasoline.
www.komoradio.com /news/health/4849186.html   (595 words)

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