Document Detail


Physical and chemical characterization of airborne particles from welding operations in automotive plants.
MedLine Citation:
PMID:  18464098     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Airborne particles were characterized from six welding operations in three automotive plants, including resistance spot welding, metal inert gas (MIG) welding and tungsten inert gas (TIG) welding of aluminum and resistance spot welding, MIG welding and weld-through sealer of galvanized steel. Particle levels were measured throughout the process area to select a sampling location, followed by intensive particle sampling over one working shift. Temporal trends were measured, and particles were collected on filters to characterize their size and chemistry. In all cases, the particles fell into a bimodal size distribution with very large particles >20 mum in diameter, possibly emitted as spatter or metal expulsions, and very small particles about 1 mum in diameter, possibly formed from condensation of vaporized metal. The mass median aerodynamic diameter was about 1 mum, with only about 7% of the particle mass present as ultrafine particles <100 nm. About half the mass of aluminum welding particles could be accounted for by chemical analysis, with the remainder possibly present as oxygen. Predominant species were organic carbon, elemental carbon, iron, and aluminum. More than 80% of the particle mass could be accounted for from steel welding, primarily present as iron, organic carbon, zinc, and copper. Particle concentrations and elemental concentrations were compared with allowable concentrations as recommended by the Occupational Safety and Health Administration and the American Conference of Governmental Industrial Hygienists. In all cases, workplace levels were at least 11 times lower than recommended levels.
Authors:
Jean Dasch; James D'Arcy
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of occupational and environmental hygiene     Volume:  5     ISSN:  1545-9632     ISO Abbreviation:  J Occup Environ Hyg     Publication Date:  2008 Jul 
Date Detail:
Created Date:  2008-05-08     Completed Date:  2008-08-12     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101189458     Medline TA:  J Occup Environ Hyg     Country:  United States    
Other Details:
Languages:  eng     Pagination:  444-54     Citation Subset:  IM    
Affiliation:
General Motors R&D Center, Chemical & Environmental Science Laboratory, Warren, Michigan 48090, USA. jean.m.dasch@gm.com
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MeSH Terms
Descriptor/Qualifier:
Air Pollutants, Occupational / analysis,  chemistry*
Aluminum / analysis
Automobiles
Environmental Monitoring / methods
Humans
Inhalation Exposure
Occupational Exposure / analysis*
Particle Size
Particulate Matter / analysis,  chemistry*
Steel / analysis
Tungsten / analysis
Welding*
Chemical
Reg. No./Substance:
0/Air Pollutants, Occupational; 0/Particulate Matter; 12597-69-2/Steel; 7429-90-5/Aluminum; 7440-33-7/Tungsten

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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