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Emissions of chromium (VI) from arc welding.
| Content Provider | Scilit |
|---|---|
| Author | Heung, William Yun, Myoung-Jin Chang, Daniel P. Y. Green, Peter G. Halm, Chris |
| Copyright Year | 2007 |
| Description | The presence of Cr in the +6 oxidation state (Cr[VI]) is still observed in ambient air samples in California despite steps taken to reduce emissions from plating operations. One known source of emission of Cr(VI) is welding, especially with high Cr-content materials, such as stainless steels. An experimental effort was undertaken to expand and update Cr(VI) emission factors by conducting tests on four types of arc-welding operations: gas-metal arc welding (GMAW), shielded metal arc welding (SMAW), fluxcore arc welding, and pulsed GMAW. Standard American Welding Society hood results were compared with a total enclosure method that permitted isokinetic sampling for particle size-cut measurement, as well as total collection of the aerosol. The fraction of Cr(VI) emitted per unit mass of Cr electrode consumed was determined. Consistent with AP-42 data, initial results indicate that a significant fraction of the total Cr in the aerosol is in the +6 oxidation state. The fraction of Cr(VI) and total aerosol mass produced by the different arc welding methods varies with the type of welding process used. Self-shielded electrodes that do not use a shield gas, for example, SMAW, produce greater amounts of Cr(VI) per unit mass of electrode consumed. The formation of Cr(VI) from standard electrode wires used for welding mild steel was below the method detection limit after eliminating an artifact in the analytical method used. |
| Related Links | http://www.tandfonline.com/doi/pdf/10.1080/10473289.2007.10465314?needAccess=true |
| Ending Page | 260 |
| Page Count | 9 |
| Starting Page | 252 |
| ISSN | 10962247 |
| e-ISSN | 21622906 |
| DOI | 10.1080/10473289.2007.10465314 |
| Journal | Journal of the Air & Waste Management Association |
| Issue Number | 2 |
| Volume Number | 57 |
| Language | English |
| Publisher | Informa UK Limited |
| Publisher Date | 2007-03-01 |
| Access Restriction | Open |
| Subject Keyword | Journal: Journal of the Air & Waste Management Association Environmental Sciences Aerosol Arc Welding Emission Steel Shielded Shield Gas |
| Content Type | Text |
| Resource Type | Article |
| Subject | Atmospheric Science Pollution Waste Management and Disposal Management, Monitoring, Policy and Law |
