首页> 外文期刊>The Annals of Occupational Hygiene >EFFECT OF PREPARATION METHODS ON THE ASSESSMENT OF AIRBORNE CONCENTRATIONS OF ASBESTOS FIBRES BY TRANSMISSION ELECTRON MICROSCOPY
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EFFECT OF PREPARATION METHODS ON THE ASSESSMENT OF AIRBORNE CONCENTRATIONS OF ASBESTOS FIBRES BY TRANSMISSION ELECTRON MICROSCOPY

机译:制备方法对透射电子显微镜评估石棉纤维中空气浓度的影响

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摘要

The usual indirect and direct preparation methods used to assess the airborne asbestos fibre concentrations by transmission electron microscopy (TEM) have been investigated in detail. It has been shown that ultrasonics, often used in the indirect preparation method to facilitate the recovery of dust, may significantly increase the fibre number concentration. This effect is highly variable and dependent on the characteristics of the workplace where the samples were collected. If the indirect preparation method is modified to avoid the use of the ultrasonic treatment, both the direct and indirect preparation methods give comparable results for fibres of length greater than 5 μm. By contrast, the number concentrations of fibres shorter than 5 μm are always different but the reason for this is not clear.
机译:已详细研究了用于通过透射电子显微镜(TEM)评估空气中石棉纤维浓度的间接和直接制备方法。业已表明,通常在间接制备方法中使用的超声波可促进粉尘的回收,它可能会显着增加纤维数的浓度。这种影响是高度可变的,并取决于收集样品的工作场所的特征。如果修改间接制备方法以避免使用超声波处理,则对于长度大于5μm的纤维,直接制备方法和间接制备方法均会得出可比的结果。相比之下,短于5μm的纤维的数量浓度始终是不同的,但是其原因尚不清楚。

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