Search PubMed⌕ Search

SEARCH · Search PubMed

Results for “Maximum Allowable Concentration”

Search indexed PubMed citations on genomics, clinical trials, systematic reviews and public health. Explore titles, authors and supplied subject terms, then open the PubMed record.

Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.

At least 415 records · Page 23Linked to original sources
PubMed1990

[Evaluation of effects of dust prevention in the principal tungsten mines in Jiangxi].

An evaluation of the effects of dust prevention in the Jiangxi tungsten mines has been carried out. The rate of silicosis morbidity in most mines was under 1%. Up to 1983, the rate in individual mines is 1.95%. According to the data from those mines, the forecasting of cumulative probability of morbidity of mine workers having been in contact with dust for 30 years is up to 7.5%. From those data, the authors suggest that the maximum permissible concentration of dust should be 1.0 mg/m3 in the mines with concentration of silicon dioxide dust over 70%.

Dust↗
PubMed1980

[Toxicity and dose-response (effect) relationship of n-hexane (author's transl)].

A large amount of n-hexane is being widely used in industry as a solvent or a component of the mixed solvents for extraction of vegetable oils, adhesives, paints, and for cleaning, etc. And, many cases of polyneuropathy due to n-hexane have been reported up to now. Recently, studies on the neurotoxicity and metabolism of n-hexane rapidly progressed in many countries. The present review covers clinical signs and symptoms, pathological changes, metabolism, dose-response (effect) in acute exposure, glue or thinner sniffers, workers, animal experiments. The joint effects and the maximal allowable concentration of n-hexane are also briefly discussed.

Animals↗
PubMed1996

[Radon and its decay products in the air of preschool institutions of Serpukhov].

The article deals with some methodic recommendations associated with examination of "radon" factor in preschool institution buildings. The recommendations result from analysis of general and selected studies that covered preschool institution buildings varying in length of service in Serpoukhov town of Moscow region in 1993-1994. The examinations were carried out by Serpoukhov State Center for Sanitary and Epidemiologic Supervision in accordance with Regulation Document No 5789-91. In order to reveal the buildings with higher possible occurrence of maximal allowable concentrations of radon and its derivatives, as the studies proved, the examinations in the region are expedient in the summer morning hours.

Air Pollutants, Radioactive↗
PubMed1979

[A theoretical study on the maximum permissible concentration of mercury vapor (author's transl)].

Mercury concentrations in the brain of man exposed to mercury vapor at or around the maximum permissible concentration were estimated by two mathematical models using informatins obtained from human and animal experiments. (formula: see text) Ac=concentration in the brain, C=concentration in air, V=ventilation volume, T=daily exposure time, R=proportion of mercury vapor retained after a single inhalation, D=proportion distributed to the brain, W=weight of the brain, b=elimination constant of mercury vapor in the brain, d=elimination constant of mercuric mercury in the brain, c=proportion of oxidization of elemental mercury in the brain. Model 1 is composed from a simple hypothesis that mercury vapor retained in the brain takes a single elimination coefficient, and in Model 2, a modification of Model 1, the part of elemental mercury retained in the brain is oxidized and thus has a different biological half-time from elemental mercury. During exposure to mercury vapor at the concentration of 0.05 mgHg/m3, estimated concentrations in the brain by Model 1 do not exceed a hypothetical critical concentration in the brain of 1.0 micrometerHg/g tissue but the estimated concentration by Model 2 exceeds this level.

Brain↗