Threshold Limit Value–Short-Term Exposure Limit (TLV–STEL)

2016 ◽  
Author(s):  
Monica Nordberg ◽  
John H. Duffus ◽  
Douglas M. Templeton
Keyword(s):  
Threshold Limit Value ◽  
Short Term ◽  
Limit Value ◽  
Threshold Limit ◽  
Exposure Limit ◽  
Short Term Exposure

Use of Methanol as a Coolant During Machining of Aluminum in a Shipbuilding Environment: A Failure to Assess and Manage Risk

2014 ◽  
Vol 955-959 ◽  
pp. 1061-1064 ◽  
Author(s):  
Thomas Neil McManus ◽  
Assed N. Haddad
Keyword(s):  
Weighted Average ◽  
Threshold Limit Value ◽  
Breathing Zone ◽  
Short Term ◽  
Limit Value ◽  
Diffusion Tubes ◽  
Exposure Limit ◽  
Long Duration ◽  
Short Term Exposure ◽  
Time Weighted Average

Minimization of harm during the conduct of work is one of the most important tenets of industrial hygiene. Organizations make changes to solve perceived problems. What appears to be expedient for solving a problem can create serious risks totally unrecognized by the proponent. This investigation reports on such a situation involving the use of methanol as a lubricant during machining of aluminium panels using a router. Spot samples for methanol were measured using colorimetric detector tubes and samples of long duration by colorimetric diffusion tubes utilizing similar chemistry. Both were positioned in the breathing zone. Most of the spot samples exceeded the 8-hour TLV-TWA (Threshold Limit Value-Time-Weighted Average) of 200 ppm and the TLV-STEL (Short-Term Exposure Limit) of 250 ppm. The two long duration samples also exceeded the TLV-TWA. A change in the operation prevented collection of additional long duration samples. By these measures, workers were overexposed to methanol during this activity. An additional serious consequence from use of methanol in this manner was risk of fire. This situation illustrates the complexity of decisions affecting workplace operations. What appears to be expedient for solving a problem may be totally inappropriate.

scholarly journals Volatile and semi-volatile organic compounds in smoke exposure of firefighters during prescribed burning in the Mediterranean region

2010 ◽  
Vol 19 (5) ◽  
pp. 606 ◽  
Author(s):  
Toussaint Barboni ◽  
Magali Cannac ◽  
Vanina Pasqualini ◽  
Albert Simeoni ◽  
Eric Leoni ◽  
...  
Keyword(s):  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Prescribed Burning ◽  
Management Tool ◽  
Fire Intensity ◽  
Short Term ◽  
Limit Value ◽  
Exposure Limit ◽  
Short Term Exposure ◽  
Volatile Organic

Prescribed fires can be used as a forest management tool to reduce the severity of wildfires. Thus, over prolonged and repeated periods, firefighters are exposed to toxic air contaminants. This work consisted in collecting and analysing smoke released by typical Mediterranean vegetation during prescribed burning. Sampling was performed at five active zones on the island of Corsica. Seventy‐nine compounds were identified: volatile organic compounds and semi‐volatile organic compounds, including polycyclic aromatic hydrocarbons. Depending on exposure levels, the toxins present in smoke may cause short‐term or long‐term damage to firefighters’ health. The dangerous compounds emitted, benzene, toluene, ethylbenzene and xylenes, were quantified. Their concentrations varied as a function of the study site. These variations were due to the intrinsic and extrinsic characteristics of the fire site (e.g. plant species, fire intensity and wind). Our results show that benzene concentration is high during prescribed burning, close to the exposure limit value or short‐term exposure limit. Benzene can be considered as a toxicity tracer for prescribed burning because its concentration was above the exposure limit value at all the study sites. The authors suggest that respirators should be used to protect staff during prescribed burning operations.

EXPERIMENTAL SUBSTANTIATION OF THE MAXIMUM ALLOWABLE CONCENTRATION OF DIOCTYL TEREPHTHALATE IN THE AIR OF THE WORKING AREA

2020 ◽  
pp. 34-38
Author(s):  
A. S. Radilov ◽  
S. A. Solntseva ◽  
I. E. Shkaeva ◽  
S. A. Dulov ◽  
E. V. Vivulanets ◽  
...  
Keyword(s):  
Central Nervous System ◽  
Nervous System ◽  
Functional State ◽  
Hematological Parameters ◽  
Inhalation Exposure ◽  
Threshold Limit Value ◽  
Maximum Allowable Concentration ◽  
Limit Value ◽  
Threshold Limit ◽  
The Central Nervous System

Toxicity and hazard assessment of dioctyl terephthalate (DOTP) was performed in acute, subacute, and chronic experiments, and its principal toxicometry parameters were determined.It was found that on single exposure DOTP exhibits low toxicity and hazard. No resorptive and irritant effects on skin and mucous membrane of eyes were detected in animal experiments. The single inhalation exposure threshold limit value was set at 300 mg/m3, based on the results of monitoring of the functional state of the central nervous system and myocardium and hematological parameters.Thirty-day subacute experiments (oral administration, inhalation exposure, and skin applications) revealed no accumulation of the compound.Four-month chronic exposure to DOTP aerosols (concentration 96,8 mg/m3) caused disorder of the functional state of the central nervous system and myocardium, changes in the hematological and biochemical parameters, gas and acid-base status of the blood, and morphological changes in the lungs and heart. Embryotoxic, genotoxic and gonadotoxic effects were not detected.The chronic inhalation exposure threshold limit value for DOTP (Limch) was set at 18,6 mg/m3, and the concentration of 3,4 mg/m3 was found to be ineffective.The maximum allowable concentration of DOTP in the air of the working area was set at 3,0 mg/m3, hazard class 3.

Metallic Mercury Contamination of the Dental Operatory

1975 ◽  
Vol 17 (4) ◽  
pp. 346-355 ◽  
Author(s):  
Richard G. Domey
Keyword(s):  
San Antonio ◽  
Threshold Limit Value ◽  
Mercury Contamination ◽  
Metallic Mercury ◽  
General Lack ◽  
Limit Value ◽  
Threshold Limit ◽  
Routine Monitoring ◽  
Cleaning Methods

The American Conference of Governmental Industrial Hygienists 1971 standard threshold limit value (TLV) of 0.55 mgHg/m of air was found to be exceeded frequently in a sample of 60 dental operatories in San Antonio, Texas. Significant differences in contamination among laboratories were found, among sites within operatories, and among times of day, correlated with kilograms of mercury used, average number of amalgams inserted per day, age of operatories, height of carpeting pile, cleaning methods, frequency of cleaning, and general lack of routine monitoring and use of bioassays. Recommendations for control of metallic mercury contamination in dental operatories are offered.

scholarly journals Modeling the Effect of the 2018 Revised ACGIH® Hand Activity Threshold Limit Value® (TLV) at Reducing Risk for Carpal Tunnel Syndrome

2019 ◽  
Vol 16 (9) ◽  
pp. 628-633 ◽  
Author(s):  
Marcus Yung ◽  
Ann Marie Dale ◽  
Jay Kapellusch ◽  
Stephen Bao ◽  
Carisa Harris-Adamson ◽  
...  
Keyword(s):  
Carpal Tunnel Syndrome ◽  
Carpal Tunnel ◽  
Threshold Limit Value ◽  
Limit Value ◽  
Threshold Limit ◽  
Tunnel Syndrome
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