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首页> 外文期刊>Journal of occupational and environmental hygiene >Assessment of occupational exposure to asbestos fibers: Contribution of analytical transmission electron microscopy analysis and comparison with phase-contrast microscopy
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Assessment of occupational exposure to asbestos fibers: Contribution of analytical transmission electron microscopy analysis and comparison with phase-contrast microscopy

机译：评估石棉纤维的职业暴露：分析透射电子显微镜分析的贡献及相对逆显微镜的比较

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From November 2009 to October 2010, the French general directorate for labor organized a large field-study using analytical transmission electron microscopy (ATEM) to characterize occupational exposure to asbestos fibers during work on asbestos containing materials (ACM). The primary objective of this study was to establish a method and to validate the feasibility of using ATEM for the analysis of airborne asbestos of individual filters sampled in various occupational environments. For each sampling event, ATEM data were compared to those obtained by phase-contrast optical microscopy (PCOM), the WHO-recommended reference technique. A total of 265 results were obtained from 29 construction sites where workers were in contact with ACM. Data were sorted depending on the combination of the ACM type and the removal technique. For each "ACM-removal technique" combination, ATEM data were used to compute statistical indicators on short, fine and WHO asbestos fibers. Moreover, exposure was assessed taking into account the use of respiratory protective devices (RPD). As in previous studies, no simple relationship was found between results by PCOM and ATEM counting methods. Some ACM, such as asbestos-containing plasters, generated very high dust levels, and some techniques generated considerable levels of dust whatever the ACM treated. On the basis of these observations, recommendations were made to measure and control the occupational exposure limit. General prevention measures to be taken during work with ACM are also suggested. Finally, it is necessary to continue acquiring knowledge, in particular regarding RPD and the dust levels measured by ATEM for the activities not evaluated during this study.
机译：从2009年11月到2010年10月，法国劳工总局使用分析透射电子显微镜（ATEM）组织了一个大型现场研究，以在含石棉含有物质（ACM）的工作期间在石棉纤维上表征职业暴露。本研究的主要目标是建立一种方法，并验证使用ATEM用于分析各种职业环境中采样的个体过滤器的空中石棉的可行性。对于每个采样事件，将ATEM数据与通过相位对比光学显微镜（PCOM）获得的数据进行比较，推荐的参考技术。共有265个结果是从29个建筑工地获得的，工人与ACM接触。根据ACM类型的组合和删除技术进行排序。对于每个“ACM除载技术”组合，ATEM数据用于计算短，精细和世卫组织纤维的统计指标。此外，考虑到呼吸保护装置（RPD）的使用评估了暴露。与之前的研究一样，PCOM和ATEM计数方法的结果没有发现简单的关系。一些ACM，例如含石棉的膏药，产生非常高的粉尘水平，以及一些技术，无论ACM处理如何，都会产生相当大的灰尘。在这些观察结果的基础上，建议衡量和控制职业暴露限额。还提出了在与ACM工作期间采取的一般预防措施。最后，有必要继续获取知识，特别是关于RPD和由ATEM测量的灰尘水平用于在本研究期间未评估的活动。

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