Blake Charles L, Dotson G Scott, Harbison Raymond D
Bureau Veritas North America, Inc., Kennesaw, GA 30144, USA.
Regul Toxicol Pharmacol. 2008 Dec;52(3):324-31. doi: 10.1016/j.yrtph.2008.09.001. Epub 2008 Sep 7.
Two independent assessments were performed of airborne asbestos concentrations generated during automotive repair work on vintage vehicles . The first involved removal of asbestos-containing seam sealant, and the second involved servicing of a drive clutch. Despite the relatively high concentrations (5.6-28%) of chrysotile fibers detected within bulk samples of seam sealant, the average asbestos concentration for personal breathing zone (PBZ) samples during seam sealant removal was 0.006 f/cc (fibers/cubic centimeter of air). Many other air samples contained asbestos at or below the analytical limit of detection (LOD). Pneumatic chiseling of the sealant material during removal resulted in 69% of area air samples containing asbestos. Use of this impact tool liberated more asbestos than hand scraping. Asbestos fibers were only detected in air samples collected during the installation of a replacement clutch. The highest asbestos corrected airborne fiber concentration observed during clutch installation was 0.0028 f/cc. This value is approximately 100 times lower than Occupational Safety and Health Administration's (OSHA) permissible exposure limit (PEL) of 0.1f/cc. The airborne asbestos concentrations observed during the servicing of vintage vehicles with asbestos-containing seam sealant and clutches are comparable to levels reported for repair work involving brake components and gaskets.
对老式车辆进行汽车维修时产生的空气中石棉浓度进行了两项独立评估。第一项涉及去除含石棉的接缝密封剂,第二项涉及驱动离合器的维修。尽管在接缝密封剂的大量样品中检测到相对较高浓度(5.6 - 28%)的温石棉纤维,但在去除接缝密封剂期间个人呼吸区(PBZ)样品的平均石棉浓度为0.006纤维/立方厘米(纤维/每立方厘米空气)。许多其他空气样品中的石棉含量等于或低于分析检测限(LOD)。去除密封剂材料时使用风铲导致69%的区域空气样品含有石棉。使用这种冲击工具释放的石棉比手工刮擦更多。仅在安装更换离合器期间采集的空气样品中检测到石棉纤维。离合器安装期间观察到的最高石棉修正空气传播纤维浓度为0.0028纤维/立方厘米。该值比职业安全与健康管理局(OSHA)的允许暴露极限(PEL)0.1纤维/立方厘米低约100倍。在用含石棉的接缝密封剂和离合器对老式车辆进行维修期间观察到的空气中石棉浓度与涉及制动部件和垫圈的维修工作所报告的水平相当。