Evaluation of airborne asbestos concentrations associated with the maintenance of brakes on an industrial overhead crane.
| Autor: | Ferracini T; Insight Exposure & Risk Sciences Group, Boulder, CO., Brown S; Insight Exposure & Risk Sciences Group, Boulder, CO., Simmons B; Insight Exposure & Risk Sciences Group, Boulder, CO., Avens H; Insight Exposure & Risk Sciences Group, Boulder, CO., Gaffney S; Insight Exposure & Risk Sciences Group, Boulder, CO., Dotson S; Insight Exposure & Risk Sciences Group, Boulder, CO., Sahmel J; Insight Exposure & Risk Sciences Group, Boulder, CO. |
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| Jazyk: | angličtina |
| Zdroj: | Inhalation toxicology [Inhal Toxicol] 2024 Jul; Vol. 36 (6), pp. 391-405. Date of Electronic Publication: 2024 Jul 02. |
| DOI: | 10.1080/08958378.2024.2367422 |
| Abstrakt: | Objectives: To evaluate potential airborne asbestos exposures during brake maintenance and repair activities on a P&H overhead crane, and during subsequent handling of the mechanic's clothing. Methods: Personal ( n = 27) and area ( n = 61) airborne fiber concentrations were measured during brake tests, removal, hand sanding, compressed air use, removal and reattachment of chrysotile-containing brake linings, and reinstallation of the brake linings. The mechanic's clothing was used to measure potential exposure during clothes handling. Results: All brake linings contained between 19.9% to 52.4% chrysotile asbestos. No amphibole fibers were detected in any bulk or airborne samples. The average full-shift airborne chrysotile concentration was 0.035 f/cc (PCM-equivalent asbestos-specific fibers, or PCME). Average task-based personal air samples collected during brake maintenance, sanding, compressed air use, and brake lining removal tasks ranged from 0 to 0.48 f/cc (PCME). The calculated 30-minute time-weighted average (TWA) airborne chrysotile concentration associated with 5-15 minutes of clothes handling was 0-0.035 f/cc PCME. Conclusion: The results indicated that personal and area TWA fiber concentrations measured during all crane brake maintenance and clothes handling tasks were below the current OSHA 8-h TWA Permissible Exposure Limit for asbestos of 0.1 f/cc. Further, no airborne asbestos fibers were measured during routine brake maintenance tasks following the manufacturer's maintenance manual procedures. All short-term airborne chrysotile concentrations measured during non-routine tasks were below the current 30-minute OSHA excursion limit for asbestos of 1 f/cc. This study adds to the available data regarding chrysotile exposure potential during maintenance on overhead cranes. |
| Databáze: | MEDLINE |
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