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Action Level (AL) – means a concentration of airborne beryllium of 0.1 microgram per cubic meter of air (µg/m3) calculated as an 8-hour time-weighted average (TWA). Time-weighted average (TWA) PEL – The employer must …
Copper beryllium alloys are the most commonly used form of beryllium; however, there have been few studies assessing occupational exposure in facilities that worked exclusively with this alloy versus those where pure metal or beryllium oxide may also have been present. ... The average concentration based on area samples (1964-2000) was 0.021 ...
Copper beryllium alloys are the most commonly used form of beryllium; however, there have been few studies assessing occupational exposure in facilities that worked exclusively with this alloy versus those where pure metal or beryllium oxide may also have been present. ... The average concentration based on area samples (1964-2000) was 0.021 ...
According to data collected by the Environmental Protection Agency (EPA), the average concentration of airborne beryllium in the United States is very small (0.03 nanogram/cubic meter-a nanogram ...
Natural beryllium concentrations range from a mean of 0.1 mg/kg to 40 mg/kg at locations around the world. The average beryllium concentrations in soil ranged from < 1 to 7 mg/kg in the northeast United States, to 1.14 mg/kg in California, and from 0.01 to 5.92 mg/kg in Florida ( Toxicological Profile for Beryllium, 2002).
The OSHA regulation for beryllium and its compounds is an 8-hour time-weighted average (TWA) of 2 micrograms (as beryllium) per cubic meter of air (2 µg/m 3 ). An employee should not be exposed to a concentration of beryllium and beryllium compounds exceeding 5 µg/m 3. The 30-minute maximum peak level is 25 µg/m 3.
PRODUCT IDENTITY AND USES 1.1 Identity Common name: beryllium Chemical formula: Be CAS registry number: Common synonyms: glycinium; glucinum 1.2 Physical and Chemical Properties Beryllium is a light, brittle, steel-grey metal that is stable to heat and also chemically stable.
The highest annual average beryllium concentration recorded at urban monitoring stations throughout the USA during 1981–1986 was 6.7 ng/m 3 (US EPA, 1987). People who live near a point source, such as a coal-fired power generating plant, or work in an industry with beryllium exposure may be exposed to much higher levels.
The average concentration of beryllium measured in the air in the United States during the 1980s was 0.03 nanograms per cubic meter (ng/m 3). Ambient concentrations measured in 50 cities between 1977 and 1981 were 0.1-0.4 ng/m 3. (1) Assessing Personal Exposure
Action Level (AL) – means a concentration of airborne beryllium of 0.1 microgram per cubic meter of air (µg/m3) calculated as an 8-hour time-weighted average (TWA). Time-weighted average (TWA) PEL – The employer must ensure that no employee is exposed to an airborne concentration of beryllium in excess of 0.2 μg/m3 calculated as an 8 hour TWA
8-hour Time Weighted Average (TWA) Acceptable Ceiling Concentration Acceptable maximum peak above the acceptable ceiling concentration for an 8-hr shift; ... This standard applies to any operations or sectors for which the exposure limits in the beryllium standard, § 1910.1024, are stayed or is otherwise not in effect. Abbreviations.
Generally, the recorded contents are lower (1–2 mg/kg), but the high concentrations in rare geological areas containing ore deposits of beryllium minerals account for the bulk lithospheric average of 6 mg/kg.
The geometric mean airborne beryllium concentration for the period 1949-1989 for all technical areas was 0.04 w g Be/m 3 with 97 percent of all sample below the 2.0 w g Be/m 3 occupational exposure limit (OEL). Average beryllium concentrations per decade were less than 1 w g Be/m 3 and annual geometric mean concentrations in technical area-03 ...
Exposure to beryllium can lead to beryllium sensitization, chronic beryllium disease/berylliosis, and lung cancer. These health effects have been identified with beryllium (dust, fume, mist, or solutions) exposure via inhalation or skin contact.4. 1.1.3 Workplace exposure. 5. Approximately 62,000 workers are exposed to beryllium in the workplace.
particulates in the atmosphere will settle out or be removed by precipitation. The annual average concentration of beryllium in ambient air in the United States is typically below 0.2 ng/m. 3 (EPA 2018a). Beryllium concentration in urban air is usually higher, possibly due to burning of coal and fuel oil. Sax et
Beryllium (Be) is used in several forms: pure metal, beryllium oxide, and as an alloy with copper, aluminum, or nickel. ... The highest airborne Be concentration in the laboratory was less than one-tenth of the Quebec OEL (occupational exposure limit) of 0.15 microg/m(3). ... the average exposure level would be 0.03 x 10(- 4) microg/m(3), which ...
Definitions.As used in this standard: Action level means a concentration of airborne beryllium of 0.1 micrograms per cubic meter of air (μg/m 3) calculated as an 8-hour time-weighted average (TWA).. Airborne exposure and airborne exposure to beryllium mean the exposure to airborne beryllium that would occur if the employee were not using a respirator. ...
Assuming an average airborne concentration of less than 0.03 ng/ m 3 beryllium per day, and a breathing rate of 20 m 3 of air per day, the estimated daily intake for an adult in the USA is approximately 0.6 ng of beryllium, or less, per day.
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 in a cubic meter (m³) of air. Cities have higher levels of beryllium in the air because beryllium is released from burning coal and ...
0.18 lIgll. In a study of beryllium in ground water, drinking water, and surface water, Reichert (1973) found that even in the heavily polluted Rhine and Main Rivers (Germany), the concentration was below 0.02 lIg!1. Hem (1970) estimates that the average concentration of beryllium in fresh sur face waters is less than 1 lIg/1.
An average beryllium concentration obtained from filter batches sampled over the sampling period was ascertained for each monitoring site on the network. All concentrations were significantly below the EPAQs guideline level of 0.2 ng m −3. The average concentration across the network for the duration of the study period was 7.87 pg m −3.
Beryllium is the 44th most abundant element in the Earth's crust. The average beryllium concentration in the Earth's crust is estimated to be 2–5.0 mg/kg. Approximately 50 beryllium minerals occur in nature, and over half of these are silicates. The most common beryllium silicates are beryl, chrysoberyl, and phenacite.
The concentration of beryllium in sea water is 0.2–0.6 parts per trillion. In stream water, however, ... (PEL) in the workplace with a time-weighted average (TWA) 2 µg/m 3 and a constant exposure limit of 5 µg/m 3 over 30 minutes, …
Beryllium is the 44th most abundant element in the Earth's crust. The average beryllium concentration in the Earth's crust is estimated to be 2–5.0 mg/kg. Approximately 50 beryllium minerals occur in nature, and over half of these are silicates. The most common beryllium silicates are beryl, chrysoberyl, and phenacite.
Beryllium is a lightweight but extremely strong metal used in the aerospace, electronics, energy, telecommunications, medical, and defense industries. ... The rule is estimated to provide average annual net benefits over the next 60 years of $560.9 million each year. ... process, and air concentration information that indicates that the use or ...
part, cannot be evaluated with reference to average, or normal, amounts in undisturbed materials because they were based on samples of deposits expected to have anomalous amounts of certain elements, or were based only on samples from cultivated fields. We began a sampling program in 1961 that was de-
A concise account of the literature data on baseline concentrations of Be in soils illustrates the possibility of worldwide presence of areas with a high natural background concentration of Be (up to 300 mg/kg), the crustal abundance of which is generally estimated to …
