BARIUM

bârˈēəm [Gr.,=heavy], metallic chemical element; symbol Ba; at. no. 56; at. wt. 137.33; m.p. 725 degrees Celsius; b.p. 1,640 degrees Celsius; sp. gr. 3.5 at 20 degrees Celsius; valence +2. Barium is a soft, silver-white, chemically active, poisonous metal with a face-centered cubic crystalline structure. It is an alkaline-earth metal in group IIa of the periodic table. Its principal ore is barite (barium sulfate); it also occurs in the mineral witherite (barium carbonate). The pure metal is obtained by the electrolysis of fused barium salts or, industrially, by the reduction of barium oxide with aluminum. Barium is often used in barium-nickel alloys for spark-plug electrodes and in vacuum tubes as a drying and oxygen-removing agent. Barium oxidizes in air, and it reacts vigorously with water to form the hydroxide, liberating hydrogen. In moist air it may spontaneously ignite. It burns in air to form the peroxide, which produces hydrogen peroxide when treated with water. Barium reacts with almost all of the nonmetals; all of its water-soluble and acid-soluble compounds are poisonous. Barium carbonate is used in glass, as a pottery glaze, and as a rat poison. Chrome yellow (barium chromate) is used as a paint pigment and in safety matches. The chlorate and nitrate are used in pyrotechnics to provide a green color. Barium oxide strongly absorbs carbon dioxide and water; it is used as a drying agent. Barium chloride is used in medicinal preparations and as a water softener. Barium sulfide phosphoresces after exposure to light; it is sometimes used as a paint pigment. Barite, the sulfate ore, has many industrial uses. Because barium sulfate is virtually insoluble in water and acids, it can be used to coat the alimentary tract to increase the contrast for X-ray photography without being absorbed by the body and poisoning the subject. Barium salts give a characteristic green color in the flame test. Barium metal was first isolated in 1808 by Sir Humphry Davy by electrolysis.

____________________

The Columbia Encyclopedia, Sixth Edition Copyright© 2004, Columbia University Press. Licensed from Lernout & Hauspie Speech Products N.V. All rights reserved.

-4258-

Top...
Search the Library
Books
Journals
Magazines
Newspapers
Encyclopedia
Advanced Search
About Questia
Questia is the world's largest online academic library offering full-text books, journals, and articles on thousands of topics.

Join Now...
Questia Books and Articles on: Barium
We found: 893 results
By media type:
 

Books:

 

585  

 

Journal articles:

 

81  

 

Magazine articles:

 

85  

 

Newspaper articles:

 

103  

 

Encyclopedia articles:

 

39  
 

books on: Barium  - 585 results

       More book Results: 1-10 11-20 21-30 31-40 41-50 >>  
 
1.
Radioecology: Proceedings of the First National Symposium on Radioecology Held at Colorado State University, Fort Collins, Colorado, September 10-15, 1961
Book by Vincent Schultz, Alfred W. Klement Jr.; Reinhold Pub. Corp., 1963
Subjects: Radioecology--Congresses
...Relationships to Potassium in Ecology 539 J.J. Davis Review and Discussion of Barium 557 Norman R. French Iron and Cobalt in Ecology 561 F.G. Lowman...
2.
Long-Term Environmental Effects of Offshore Oil and Gas Development
Book by Donald F. Boesch, Nancy N. Rabalais; Elsevier Applied Science, 1987
Subjects: Environmental Impact Analysis--United States, Offshore Gas Industry--Environmental Aspects--United States, Offshore Oil Industry--Environmental Aspects--United States
...of clay (or natural organic polymer), barium sulfate, lignosulfonate, lignite, and...Chapter 14). Based on inventories of barium (an excellent tracer of drilling muds...tracers of drilling discharges in sediments (barium, chromium, lignosulfonate, medium weight...
3.
The Angry Gut: Coping with Colitis and Crohn's Disease
Book by W. Grant Thompson; Perseus Books, 1993
Subjects: Inflammatory Bowel Diseases
...described by radiologists. These peristaltic rushes of barium were vividly described early in this century by...identification of megacolon or perforation Chapter 10 . A barium enema, in which barium is injected through the anus into the colon Figure...
4.
Chambers's Technical Dictionary
Book by C. F. Tweney, L. E. C. Hughes; Macmillan, 1958
Subjects: Technology--Dictionaries
5.
Encyclopedia of Family Health - Vol. 2
Book by David B. Jacoby, Robert M. Youngson; Marshall Cavendish, 2005
Subjects: Health--Encyclopedias, Medicine, Popular--Encyclopedias
...Baldness 169 Barbiturates 170 Barium liquids 171 Basal metabolic rate 173...side to prevent vomit from being inhaled. Barium liquids My doctor says I need a barium meal. What does it taste like, and will...
More book Results: 1-10 11-20 21-30 31-40 41-50 >>

Top...
 

journal articles on: Barium  - 81 results

       More journal Results: 1-10 11-20 21-30 31-40 41-50 >>  
 
1.
Metals in Urine and Peripheral Arterial Disease
Journal article by Ana Navas-Acien, Ellen K. Silbergeld, A. Richey Sharrett, Emma Calderon-Aranda, Elizabeth Selvin, Eliseo Guallar; Environmental Health Perspectives, Vol. 113, 2005
Subjects: Johns Hopkins University. Bloomberg School of Public Health, United States. National Center for Health Statistics, Workers' compensation
...between urinary levels of cadmium, lead, barium, cobalt, cesium, molybdenum, antimony...For several other metals, including barium, cobalt, molybdenum, antimony, and thallium...explored the association of PAD with urinary barium, cobalt, cesium, molybdenum, antimony...
2.
Is Knowing Believing? the Role of Event Plausibility and Background Knowledge in Planting False Beliefs about the Personal Past
Journal article by Kathy Pezdek, Iris Blandon-Gitlin, Shirley Lam, Rhiannon Ellis Hart, Jonathan W. Schooler; Memory & Cognition, Vol. 34, 2006
Subjects: Experiments, Memory, Sex crimes
...detailed procedural information about how a barium enema is administered in the hospital...information about the high prevalence rate of barium enemas; (3) neither passage; or (4) both...providing subjects with knowledge about a barium enema procedure was sufficient to increase...
3.
Environmental Pollution in India: Heavy Metals and Radiogenic Elements in Nacharam Lake
Journal article by P.K. Govil, G.L.N. Reddy, T. Gnaneswara Rao; Journal of Environmental Health, Vol. 61, 1999
Subjects: Analytic geochemistry--Case studies, Hyderabad, India--Environmental aspects, Lake sediments--Analysis, Water pollution--Case studies
...zinc, strontium, nickel, copper, and barium, exceeded the average abundance of these...8.88 1.82 1.65 Barium 156.30 117.30 115.90...milligrams per kilogram (mg/kg) (10, 23). Barium concentrations of up to 2,200 ppm were...
4.
Archaeology and Early Chinese Glass Trade in Southeast Asia
Journal article by John N. Miksic, C.T. Yap, Hua Younan; Journal of Southeast Asian Studies, Vol. 25, 1994
Subjects: Archaeological expeditions--Asia, China--History, Glass beads--International trade, Southeast Asia--History
...by high concentrations of lead, zinc, barium and tin. Both by composition and appearance...compared to the other glass, and very little barium or cesium. Within the bead group, variations...both soda-lime and lead-based glass.(4) Barium is present in small amounts in 14 of the...
5.
Effects on the Immune System Associated with Living near a Pesticide Dump Site
Journal article by Marilyn F. Vine, Leonard Stein, Kristen Weigle, Jane Schroeder, Darrah Degnan, Chiu-Kit J. Tse, Carol Hanchette, Lorraine Backer; Environmental Health Perspectives, Vol. 108, 2000
...2,463,000 Barium 194,000...3,300 Barium 21,195...Barium 9,434...
More journal Results: 1-10 11-20 21-30 31-40 41-50 >>

Top...
 

magazine articles on: Barium  - 85 results

       More magazine Results: 1-10 11-20 21-30 31-40 41-50 >>  
 
1.
Get Carded with Confidence
Magazine article by Barry Clarke; Security Management, Vol. 38, November 1994
Subjects: Automatic identification equipment--Evaluation, Automatic identification systems--Evaluation, Identification equipment
...installed base. Magnetic stripe, Wiegand, and barium ferrite card technologies all fall somewhere...write proximity technology. Wiegand and barium ferrite still dominate the market as a...technology has to offer. Card history. Barium ferrite technology was first used for...
2.
It's in the Cards
Magazine article by Richard L. Mourey; Security Management, Vol. 33, July 1989
Subjects: Electronic locking devices--Safety and security measures, Electronic security systems--Innovations, Security systems--Innovations
...Wiegand, * magnetic stripe, * proximity, * barium ferrite, * infrared, * bar code, * smart...include Wiegand, magnetic stripe, and barium ferrite. Optical technologies include...cold climates a heater may be required. Barium ferrite. This older technology uses small...
3.
Coast to Coast Security
Magazine article by Richard S. Mccracken; Security Management, Vol. 42, August 1998
Subjects: Aetna Inc.--Safety and security measures, Closed circuit television equipment, Electronic security systems--Innovations, Facility security--Equipment and supplies, Insurance industry--Safety and security measures, Intercoms, Security systems industry--Equipment and supplies, Security systems--Innovations
...were more than ten years old and used barium ferrite technology. The readers also had...Card technology. The SSDE decided that barium ferrite technology still met the companys...technology. Once SSDE decided to stay with barium ferrite cards, there were only two companies...
4.
Historically Speaking
Magazine article by Tony Patti; PSA Journal, Vol. 57, June 1991
Subjects: Camera lenses--History
...Did You Know That good lens designs did not come about until glassess having different indices of refraction were developed? Barium crown glass was not developed until 1894 and was a great stride in correction of optical aberrations. One of the first significant...
5.
It's All in the Cards
Magazine article by Donald Tank, Kirk Georgia; Security Management, Vol. 34, November 1990
Subjects: Identification cards--Varieties, Security systems--Innovations, Smart cards--Usage
...circuit and electrostatic card, the Wiegand card, the barium ferrite card, the magnetic stripe card, the bar...stored in this card, and costs range from $4 to $6. Barium ferrite cards. The barium ferrite card is almost exclusively used for security...
More magazine Results: 1-10 11-20 21-30 31-40 41-50 >>

Top...
 

newspaper articles on: Barium  - 103 results

       More newspaper Results: 1-10 11-20 21-30 31-40 41-50 >>  
 
1.
Asthma Snow Risk
Newspaper article; Daily Record (Glasgow, Scotland), December 18, 2008
Subjects: Asthma--Risk factors
Asthma Snow Risk. ASTHMATICS could be at risk from a dangerous combination of fireworks and snow. Scientists have found barium, used for the green effect in fireworks, can constrict the airways. And the metal clings to snowflakes which, if inhaled by...
2.
Our Health: Q & A
Newspaper article; Sunday Mercury (Birmingham, England), July 25, 1999
...good health but I suffer from a pain in my right side which goes through to my back and sometimes under my ribs. I have had a barium meal, X-rays and blood and urine tests which were all clear. What could be causing it? B.D., Great Barr AFROM what you say...
3.
DEADLIEST SHIRT IN THE WORLD; 9/11 Survivor's Toxic Clothing Sparks Cancer Fear
Newspaper article; The Mirror (London, England), April 17, 2006
...limit. It is also saturated with toxic zinc, mercury, antimony, barium, chromium, cobalt, copper, lead and molybdenum. More than a...MERCURY Hg ZINC Zn COBALT Co CHROMIUM Cr ANTIMONY Sb COPPER Cu BARIUM Ba LEAD Pb MOLYBDENUM Mo POISON: Yehudas lethal 9/11 shirt RAGE...
4.
West Dundee to Hire Water Plant Builder
Newspaper article by Alexia Elejalde-Ruiz; Daily Herald (Arlington Heights, IL), December 20, 2005
...byproduct of the expansion, however, is more barium, a chemical typically found in deep well water. The treatment plant will remove the barium from the water that goes to residents...where certain chemicals pluck out the barium from the water. However, the barium-laden...
5.
Offthe Record
Newspaper article; Daily Record (Glasgow, Scotland), July 25, 2006
...entries were not sure are entirely accurate. For example: Artery: The study of paintings. Bacteria: Back door to the cafeteria. Barium: What doctors do when patients die. Cauterise: Making eye contact with a woman. Coma: Apunctuation mark. Dilate: To live longer...
More newspaper Results: 1-10 11-20 21-30 31-40 41-50 >>

Top...
 

encyclopedia articles on: Barium  - 39 results

       More encyclopedia Results: 1-10 11-20 21-30 31-39 >>  
 
1.
Barium
Encyclopedia article; The Columbia Encyclopedia, Sixth Edition, 2009
BARIUM bar e m Gr.,=heavy, metallic chemical element; symbol...Celsius; sp. gr. 3.5 at 20 degrees Celsius; valence +2. Barium is a soft, silver-white, chemically active, poisonous metal...the periodic table . Its principal ore is barite (barium sulfate); it also occurs in the mineral witherite (barium...
2.
Periodic Table of the Elements: Barium
Encyclopedia article; The Columbia Encyclopedia, Sixth Edition, 2009
PERIODIC TABLE OF THE ELEMENTS: BARIUM Periodic Table of the Elements: Barium Atomic Number: 56 Atomic Symbol: Ba Barium Atomic Weight: 137.33 Electron Configuration: 2 8 18 18 8 2 ____________________ Copyright...
3.
Barium Sulfate
Encyclopedia article; The Columbia Encyclopedia, Sixth Edition, 2009
BARIUM SULFATE see barite . ____________________ Copyright 2009 Columbia University Press. Used with the permission of Columbia University Press. All rights reserved.
4.
Barite
Encyclopedia article; The Columbia Encyclopedia, Sixth Edition, 2009
...bar it, barytes b ri tez New Lat., from barium, or heavy spar, a white, yellow, blue...colorless mineral. It is a sulfate of barium, BaSO 4 , found in nature as tabular crystals...Barite is used as a commercial source of barium and many of its compounds. Ground barite...
5.
Sulfate
Encyclopedia article; The Columbia Encyclopedia, Sixth Edition, 2009
...mercuric sulfates are only slightly soluble, while barium, lead, strontium, and mercurous sulfates are...ion , SO 4 2 , is usually detected by adding barium chloride solution; the white barium sulfate precipitate that forms is insoluble in...
More encyclopedia Results: 1-10 11-20 21-30 31-39 >>

Top...
 About Questia   ::   Privacy   ::   Contact