Interwedge variation in the membrane filter method for airborne asbestos fibers.
Interwedge variation in the membrane filter method for airborne asbestos fibers.
复制标题
针对空气中石棉纤维的膜过滤方法中的楔形变化。
DOI：
10.1080/15298668391405274
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发表时间：
1983
期刊：
影响因子：
--
通讯作者：
Ludwig,DA
中科院分区：
文献类型：
--
作者：
Hook,MB;Feigley,CE;Ludwig,DA
目前的石棉法(NIOSH P&CAM139)的精密度较差与过滤器上纤维沉积的变化有关，但这种变化的原因尚不清楚。建造了一台沸腾床发电机，以产生含有石棉纤维的试验气氛，并采集了空气样本。在过滤器正下方的盒中对应于沟槽图案的过滤器位置处对纤维进行计数。从径向沟槽上方获取的楔形物上的平均纤维计数显著高于从过滤器其他部分获取的楔形物上的纤维计数(Pr>；F=0.0001)。过滤器上石棉纤维沉积变化的主要原因是支持过滤器的滤盒中的沟槽图案。
The poor precision of the current asbestos method (NIOSH P&CAM 139) has been linked to the variation in fiber deposition on the filter, but the cause of this variation had been unknown. A fluidized bed generator was constructed to produce a test atmosphere containing asbestos fibers, and air samples were collected. Fibers were counted at filter positions corresponding to the trench pattern in the cassette directly below the filter. The average fiber counts on wedges taken from above radial trenches were significantly higher (Pr>F=0.0001) than counts on wedges taken from other portions of the filters. The chief cause of variation in asbestos fiber deposition on the filter is the trench pattern in the cassette supporting the filter.