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BERYLLIUM

BeRYLLIUM

bErryllium

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Beryllium is a metal that is often allied with copper to improve copper's strength,

Beryllium was once used on motherboards but its primary use in in contact springs found in printed circuit boards, relays, and in the mirror mechanism of laser printers.

Beryllium is hazardous only if inhaled as dust or fumes which may occur when computer are dissasembled, shredded, burned or recycled. Inhaling of beryllium dust causes a pnuemonia like condition.

Some individuals who are exposed this dust develop a repiratory inflammation called chronic beryllium disease . Beryllium is a probably carcinogen. Exposure to berrylium dust may increase the risk of lung cancer.

Beryllium does not dissolve well in water and is not prone to transport.

Beryllium - (Gr. beryllos.' beryl; also called Glucinium or Glucinum, Gr. glykys, sweet), Be; at. wt. 9.012182; at no. 4; m.p. 1287'C; b.p. 2471'C; sp. cyr. 1.948 (20'C): valence 2. Discovered as the oxide by Vauquelin in beryl and in emeralds in 1798. The metal was isolated in 1828 by Wobler and by Bussy independently by the action of potassium on beryllium chloride. Beryllium is found in some 30 mineral species, the most important of which are bertrandite, beryl, chrysoberyl, and phenacite.

Aquamarine and emerald are precious forms of beryl. Beryl (3BeO - Al2O3-6SiO2) and bertrandite (4BeO - 2SiO2- H2O) are the most important commercial sources of the element and its compounds. Most of the metal is now prepared by reducing beryllium fluoride with magnesium metal.

Beryllium metal did not become readily available to industry until 1957. The metal, steel gray in color, has many desirable properties. It is one of the lightest of all metals, and has one of the highest melting points of the light metals.

At ordinary temperatures beryllium resists oxidation in air, although its ability to scratch glass is probably due to the formation of a thin layer of the oxide.

Beryllium is used as an alloying agent in producing beryllium copper which is extensively used for springs, electrical contacts, spot-welding electrodes, and nonsparking tools

It has found application as a structural material for high-speed aircraft, missiles, spacecraft, and communication satellites. It is being used in the windshield , brake discs, support beams, and other structural components of the space shuttle.

Because beryllium is relatively transparent to X-rays, ultra-thin Be-foil is finding use in X-ray lithography for reproduction of microminiature integrated circuits.

Natural beryllium is made of 9Be and is stable.

Eight other radioactive isotopes are known. Beryllium is used in nuclear reactors as a reflector or moderator for it has a low thermal neutron absorption cross section.

It is used in gyroscopes, computerparts and instruments where flatness and stiffness, and dimensional stability are required. The oxide has a very high melting point and is also used in nuclear work and ceramic applications. Beryllium and its salts are toxic and should be handled with the greatest of care.

The influence of aerosol suspension from clothing on personal monitor exposure estimates was investigated in a beryllium facility. Samples of 100% cotton and 100% Nomex fabrics used at the beryllium facility were tested. The deposition of airborne beryllium into fabrics was significantly enchanced by electrostatic attraction on cotton but not on Nomex fabrics.

Both fabrics collected more beryllium in motion than on stationary units. Personal monitors mounted in front of fabrics collected more beryllium when the fabrics were agitated than when monitors were placed in the positions of the nose and mouth

Resuspension from cotton was higher than from Nomex. Ressupension of aerosol from garments can cause erroneously high exposure measurements from chest mounted personal monitors. Workshirts worn by employees at a beryllium refinery resuspended beryllium containing dust.

The old shirts resuspended significantly higher quantities of beryllium to the air than did the washed and unwashed new shirts.

A considerable fraction of the Be measured in air was respirable. Fourteen dental casting alloys were analyzed for release of nickel and beryllium into acidic salivary soln in vitro. Corrosion rates at varying pH levels and time in soln were calc over a 120 day period and the possible significance of these rates to allergic reactions or other health hazards were postulated. When the beryllium levels were analyzed for these alloys they were much higher than expected. In each of the alloys, since the nickel cmpd was often 66-78% of the cmpd and the beryllium level a max of 2%, the differences in magnitude of nickel vs beryllium concn might be expected to be on the order of 30/1 or greater. The differences were closer to 8/1. Nickel and beryllium containing dental casting alloys have the potential to be a significant hazard to the lab technician, dentist and patient.
Environmental Fate
ESTIMATES OF ABUNDANCE IN EARTH'S CRUST VARY FROM 2 TO 10 PPM. NATURAL ISOTOPES: 9 (100%); RADIOACTIVE ISOTOPES (MASS NUMBERS): 6-8; 10-12. FOUND IN PHENACITE, CHRYSOBERYL PRECIOUS FORMS OF BERYL: EMERALD, AQUAMARINE.

Beryllium is concentrated in silicate minerals relative to sulfides. In common crystalline rocks, the element is enriched in the feldspar minerals relative to ferromagnesium minerals and apparently replace the silicon ion; 85-95% of the total crystal beryllium may be bound in the feldspar structures.

At the time of review, criteria for land treatment or burial (sanitary landfill) disposal practices are subject to significant revision. Prior to implementing land disposal of waste residue (including waste sludge), consult with environmental regulatory agencies for guidance on acceptable disposal practices. Beryllium (powder) waste should be converted into chemically inert oxides using incineration and particulate collection techniques.

Recovery and recycle is an alternative to disposal for beryllium scrap and pickle liquors containing beryllium.

There is no universal method of disposal that has been proved satisfactory for all carcinogenic compounds & specific methods of chem destruction published have not been tested on all kinds of carcinogen-containing waste. Summary of avail methods & recommendations given must be treated as guide only. PRECAUTIONS FOR "CARCINOGENS":small quantities of some carcinogens can be destroyed using chem reactions but no general rules can be given. As a general technique treatment with sodium dichromate in strong sulfuric acid can be used. The time necessary for destruction is seldom known but 1-2 days is generally considered sufficient when freshly prepd reagent is used. Carcinogens that are easily oxidizable can be destroyed with milder oxidative agents, such as sat soln of potassium permanganate in acetone, which appears to be a suitable agent for destruction of hydrazines or of compounds containing isolated carbon-carbon double bonds. Concn or 50% aqueous sodium hypochlorite can also be used as an oxidizing agent. Beryllium dust is a poor candidate for incineration.

URBAN AIR METAL PARTICLE CONCENTRATION IN THE US 1964-1965. POLLUTANT BERYLLIUM; AVERAGE CONCN LESS THAN 0.0005 UG/CU M; MAX CONCN 0.010 UG/CU M. At a beryllium extraction plant in Ohio, concentrations were approximately 2 mg/cu m over a 7 year period. Beryllium was present in 12% of 440 air samples analyzed from 16 cities. Concentrations ranged from 0.001 to 0.002 ug/cu m in urban areas and 0.00013 ug/cu m in more rural areas.

Beryllium enters the air, water, and soil as a result of natural and human activities. Emissions from burning coal and oil increase beryllium levels in air. Beryllium enters waterways from the wearing away of rocks and soil. Most of the man-made beryllium that enters waterways comes when industry dumps waste water and when beryllium dust in the air from industrial activities settles over water. Beryllium, as a chemical component, occurs naturally in soil; however, disposal of coal ash, incinerator ash, and industrial wastes may increase the concentration of beryllium in soil.

In air, beryllium compounds are present mostly as fine dust particles. The dust eventually settles over land and water. Rain and snow aid in the removal of beryllium from air. Sufficiently small beryllium particles may remain airborne for about 10 days.

Most of the beryllium in water settles in the material on the bottom. Beryllium compounds remain in ocean water for a few hundred years before settling to the bottom of the ocean. Fish do not accumulate beryllium from water into their bodies to any great extent. A major portion of beryllium in soil does not dissolve in water but remains bound to soil, so it is not very likely to move deeper into the ground and enter groundwater. In the environment, chemical reactions can change the water-soluble beryllium compounds into insoluble forms. In some cases, water-insoluble beryllium compounds can change to soluble forms. Exposure to water-soluble beryllium compounds in the environment, in general, will pose a greater threat to human health than water-insoluble forms.

You can be exposed to low levels of beryllium by breathing air, eating food, or drinking water that contains beryllium. In the United States, the average concentration of beryllium in air is 0.03 nanograms (ng) (1 ng = 1 billionth of a gram) in a cubic meter (ng/m3) of air. In U.S. cities, the average air concentration is higher, and its value is 0.2 ng/m3 of air. Cities have higher levels of beryllium in the air because beryllium is released from burning coal and fuel oil. Beryllium was not found in 5% of 1,577 drinking water samples obtained throughout the United States. Of these samples, the average beryllium concentration was only 190 ng in a liter (L) of water. Beryllium, as a chemical component, is naturally found in some food. The concentration of beryllium in both raw carrots and field corn grown in the United States is less than 25 micrograms (ug) (1 ug = 1 millionth of a gram) in a kilogram (kg) of the fresh vegetables. The intake of beryllium for most people will be very small.

In certain workplaces you can be exposed to higher than normal levels of beryllium, mostly in the form of beryllium oxide and beryllium metal. Occupational exposure to beryllium occurs at places where the chemical is mined, processed, and converted into metal, alloys, and other chemicals. Workers engaged in machining metals containing beryllium, in recycling beryllium from scrap alloys, or in using beryllium products may also be exposed to higher levels of beryllium. An estimated 18,000 workers may be exposed to beryllium and beryllium oxide in the workplace.

As a member of the general public, you may be exposed to higher than normal levels of beryllium if you live near an industry that processes or uses beryllium. People who live near hazardous landfill sites that contain high concentrations of beryllium may also be exposed to higher than normal levels of beryllium. Beryllium, as a chemical component, occurs naturally in tobaccos and can be inhaled from cigarette smoke. People who smoke may breathe considerably more beryllium than people who do not smoke

Beryllium metal and metal alloys may be found in consumer products such as electronic devices (e.g., televisions, calculators, and personal computers) and special nonsparking tools.

Metabolism

Beryllium can enter your body if you breathe air, eat food, or drink water containing it. Beryllium will not enter your body from skin contact with the metal unless the skin is scraped or cut and beryllium particles become imbedded in the wound. Only a small amount of beryllium may enter your body if your skin comes into contact with a beryllium salt dissolved in water. When you breathe air containing beryllium, beryllium particles can be deposited in the lungs. The beryllium that you breathe in slowly dissolves in the lungs and moves slowly into the bloodstream. Some of the beryllium deposited in the lungs can be moved to the mouth and then swallowed; the rest can remain in your lungs for a long time. If you eat food or drink water that contains beryllium, less than 1% passes from your stomach and intestines into the bloodstream. Therefore, most of the beryllium that you swallow leaves your body through the feces without entering the bloodstream. The small amount of beryllium that moves from the lungs, stomach, and intestines into the bloodstream is carried by the blood to the kidneys. Beryllium leaves the kidneys by the urine. Some beryllium can also be carried by the blood to the liver and bones where it may remain for long periods of time. If you swallow beryllium, beryllium leaves the body in a few days. However, if you inhale beryllium, it may take months to years before your body rids itself of beryllium. This is because it takes a long time before all the beryllium in the lungs enters the bloodstream or is swallowed

Health Effects

Beryllium is a metal that can be harmful when you breathe it. The effects depend on how much and how long you are exposed to it. When you breathe it in, beryllium can damage your lungs. When you breathe in large amounts of soluble beryllium compounds, the lung damage resembles pneumonia with reddening and swelling of the lungs. This condition is called acute beryllium disease. In this case, if you stop breathing air with beryllium in it, the lung damage may heal. Some people can become sensitive to beryllium. This is known as hypersensitivity or allergy. If you become sensitive (allergic) to beryllium, you will develop an immune or inflammatory reaction to amounts of beryllium that do not cause effects in people who are not sensitive to beryllium. When this occurs, white cells accumulate around the beryllium and form a chronic inflammatory reaction called granulomas (granulomas are not tumors). This condition is called chronic beryllium disease. This disease can occur long after exposure to small amounts of either the soluble or the insoluble forms of beryllium. If you have this disease you may feel weak, tired, and have difficulty breathing.

Although the soluble and insoluble forms of beryllium can cause chronic beryllium disease, workers breathing air containing beryllium at less than 0.002 milligrams (mg) (1 mg = 1 thousandth of a gram of beryllium) in a cubic meter

Both the short-term, pneumonia-like disease and the chronic beryllium disease can be fatal. Long periods of exposure to beryllium have been reported to cause cancer in laboratory animals, but some of these studies are not reliable. Some studies of workers reported an increased risk of lung cancer, but these studies are not conclusive, and new studies are being performed. The Department of Health and Human Services has determined that beryllium and certain beryllium compounds may reasonably be anticipated to be carcinogens. The International Agency for Research on Cancer has determined that beryllium and beryllium compounds are probably carcinogenic to humans. The EPA has determined that beryllium is a probable human carcinogen. We have no evidence that breathing air, eating food, or drinking water that contains beryllium or having skin contact with beryllium has any effects on reproduction or causes birth defects in humans or animals. Swallowing beryllium has not been reported to cause effects in humans because very little beryllium can move from the stomach and intestines into the bloodstream. Beryllium contact with skin that has been scraped or cut can cause rashes or ulcers. If you have developed an allergy to beryllium and have skin contact with it, you can get granulomas on the skin. These skin granulomas appear as a rash or as nodules. The skin granulomas are formed in the same way that lung granulomas are formed in sensitive people.

Toxicological Profile for Beryllium April 1993 Update
Agency for Toxic Substances and Disease Registry
United States Public Health Service