Standards airborne contaminants exposure

B. OSHA regulations are standards for exposure to airborne contaminants, set and enforced by OSHA, an agency of the federal government. 

Activated charcoal is often used in filters to remove nonpolar airborne contaminants in ductless laboratory hoods. These are hoods that filter laboratory air but subsequently recycle the filtered air directly back into the lab. See Section 7.2.3. However, remember that if a chemical with a stronger binding energy comes in contact with the charcoal, the bound adsorbates would be released. This means that if you are working in a ductless hood with a charcoal filter, the chemical will be released into your laboratory and the potential opportunity for exposure would be significant. Currently, some new ductless hoods are being marketed for chemistry labs. If properly used and maintained, these may see application in some limited circumstances, but we believe that ducted chemical hoods as described in Sections 7.1.4 and 7.2.3 should be the standard in most chemistry labs. 

Adequate ventilation (natural, mechanical, or respiratory) must be provided for all welding, cutting, brazing, and related operations. Adequate ventilation means enough ventilation so that a person s exposure to hazardous concentrations of airborne contaminants is maintained below the level set by federal standards. 

When measurements of airborne contamination levels or other parameters have been made it is necessary to interpret results against a standard. This interpretation will form the basis for the control strategy. In considering the exposure of workers to chemicals two broad options may be presented ... 

ANSI Z9.5-2003, Laboratory Ventilation, is intended for use by employers, architects, occupational and environmental health and safety professionals, and others concerned with the control of exposure to airborne contaminants. The book includes new chapters on performance tests, air cleaning, preventative maintenance, and work practices. It also highlights the standard s requirements and offers good practices for laboratories to follow. The book also offers referenced standards and publications, guidance on selecting laboratory stack designs, an audit form for ANSI Z9.5, and a sample table of contents for a laboratory ventilation management plan. 

Mechanical ventilation See Powered ventilation. Natural ventilation A ventilation system in which air movement is produced through purpose-designed openings by natural forces (wind and thermal buoyancy). Occupational Exposure Standards OES) Limits of concentration of airborne toxic contaminants, listed by the Health and Safety Executive which are regarded as safe for prolonged exposure for 8 hours per day. 

BGCAPP or PMACWA personnel. Plans for the disposal of secondary wastes generated at BGCAPP call for the waste to be (1) shipped offsite to an approved TSDF or (2) treated onsite and then shipped offsite. Whether onsite treatment of secondary waste is needed depends on whether the waste is agent-contaminated on noncontaminated on whether it meets airborne exposure limit guidance standards for offsite slupment, which will be set in the permit and on what may be required by the approved WAP. 

High temperature stability of the fuels was measured using an Alcor, Inc. Jet Fuel Thermal Oxidation Tester (JFTOT) (j ). Low temperature (storage) stability was determined by measurement of gums, contamination and peroxide concentration (all by ASTM standard methods) before and after exposure to temperatures of 60 C for four weeks. The fuels were stored in l low actinic, dark pyrex glass bottles and were loosely covered to prevent exposure to airborne particulates. Air could still diffuse into the vessel. The vessels with fuel and various additives were thermostated at 60 C for the specified length of time. 

Who Employees who may be exposed to airborne 4,4 -Methylenedianiline (MDA) at or above its action level or where dermal exposure to MDA can occur. (Note the standard does not apply to finished articles that contain MDA or to materials in any form that contain less than 0.1% MDA by weight or volume.) Also, this standard incorporates by reference 1910.38, 1910.1200, and 1910.134, which have additional training requirements. Also, any person who cleans or launders contaminated protective clothing is to be informed of the hazards of exposure to MDA. In addition, the employer must provide specified information to the physician who is conducting medical surveillance, and the employee is to receive a copy of the physician s written opinion within fifteen days after the employer receives it. 

Exposure standards for airborne chemical contaminants ate usually set somewhat lower than the levels which cause observable effects - that is, a safety factor is built in. 

The OSHA respirator standard applies to aU occupational airborne exposures to contaminated air where the employee is ... 

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