Occupational Exposure Limit OEL

Thus, there is a clear need to establish the relationship between the health effects of hazardous chemical agents in the environment and the level of occupational exposure to the body by means of an occupational exposure limit, in which a reference figure for the concentration of a chemical agent is set. In fact, occupational exposure limits (OELs) have been a feature of the industrialized world since the early 1950s. They were introduced, primarily in the United States, at a time when measures to prevent occupational diseases were considered more beneficial than compensating victims, and in this sense OELs have played an important part in the control of occupational illnesses. 

Long-term exposure limit (LTEL) An exposure limit requirement based on the assumption that the total body intake of a pollutant below this limit over an 8-hour working day will have no harmful effect on the worker over a working life. See also Maximum exposure limit (MEL), Occupational exposure limit (OEL), and Short-term exposure limit (STEL). 

Occupational exposure limits (OEL) The maximum time a person can work in a given polluted environment. 

Occupational Exposure Limit (OEL), 81, 82, 111 Occupational Exposure Standard (OES), 16, 112 Odour threshold, 16, 82, 118 Olefins, 35... 

The easiest means for assessing occupational exposure hazards associated with materials used in a process is through the use of Permissible or Occupational Exposure Limits (OEL or PEL) which go by a variety of names for example, TLV (U.S. - American Conference of Government Industrial Hygienists), MAK (Germany), or individual company established values. Occupational exposure limits are usually set based on a combination of the inherent toxicological hazard of a chemical and a series of safety factors such as intraspecies variability in test results, nature and severity of the effect, adequacy and quality of... 

Occupational Exposure Limits (OELs) refer to airborne concentrations of substances and provide a guide to their toxicity. 

Galer, D.M., Leung, H.W., Sussman, R.G., and Trzos, R.J. (1992). Scientific and practical considerations for the development of occupational exposure limits (OELs) for chemical substances. Regulatory Toxicol. Pharmacol. 15 291-306. 

The Nordic Expert Group for Criteria Documentation of Health Risks from Chemicals (NEG) consisted of scientific experts from the five Nordic countries representing different fields of science, such as toxicology, occupational hygiene, and occupational medicine. The main task was to produce criteria documents (Figure 3.10) to be used by the regulatory authorities of the Nordic countries as the scientific basis for setting Occupational Exposure Limits (OELs) for chemical substances. 

Occupational exposure limits (OEL), 749 Occupational hazards, chemicals, 747-9 Octalene, singlet oxygen ene reaction, 861,... 

Ku RH. 2000. An overview of setting occupational exposure limits (OELs) for pharmaceuticals. Chem. Hlth Safety 7(1) 34-37. 

Properties. Osmium tetroxide forms pale yellow crystals with a very characteristic odour (a possible description is that of a mixture of ozone and damp hay). It has a considerable vapour pressure at room temperature and so must be kept in stoppered container or (preferably) in sealed ampoules. The vapour is toxic (TLV 2.5 p.p.m.).558a The long-term occupational exposure limit (OEL) is 0.002mgm 3. 558b... 

There is no clear definition for the terms safe exposure limit (SEE) and occupational exposure limit (OEL), although the terms has scientific and legal interpretations and implications. The values of SEE or OEE vary from country to country around the world. It is well known that a rough rule of thumb is that the SEEs and OEEs are levels below which most industrial workers and the general population could get exposed to chemical substances on a regular basis with a low risk to health. It should be clearly understood that SEE and OEE are certainly not levels that are definitely safe and below which no harm is caused. 

Unit operations to be performed Range of batch sizes to be processed Capital expenditures and operational costs Anticipated occupational exposure limits (OELs) to be encountered... 

International occupational exposure limits (OELs) generally range between 20 and 25 ppm as an 8h time-weighted average (TWA). The American Conference of Governmental Industrial Hygienists has established an 8 h TWA OEL for ammonia of 25 ppm with a 15 min excursion limit of 35 ppm. The National Institute of Occupational Safety and Health indicates that 300 ppm ammonia is immediately dangerous to life or health. 

Human biological exposure indices are guidance levels of determinants for assessing worker dose from occupational exposures. They differ from other occupational exposure limits (OELs) for chemicals, which typically are measured in air, in that their determinants are measured in biological materials from the workers. BEIs consider the dose that has entered a worker s body by all routes. Thus, these measurements can provide more complete estimates of exposure, especially for chemicals that may be absorbed by routes other than inhalation and when inhalation rates are altered because, for example, of increased work rates. 

---