Gibbs G W, Hwang C Y
Am Ind Hyg Assoc J. 1975 Jun;36(6):459-66. doi: 10.1080/0002889758507271.
The results of a pilot investigation to describe the physical parameters, length, aspect ratio, mass and shape of airborne fibres in a variety of industries producing processing and handling chrysotile, amosite and crocidolite are described. Samples of airborne dust were collected on nucleopore membrane filters and examined by scanning electron microscopy. The diameters and lengths of airborne fibres collected during the dumping of raw amosite at an asbestos products plant were greater than those of fibres collected during the application of amosite insulation. Chrysotile fibres collected in the carding area of an asbestos textile plant also tended to have smaller diameters than fibres collected in the dryer and bagging areas of an asbestos mill. The measurements of fibre dimensions indicate that the degree of protection afforded a worker by optical counts using the membrane filter technique is likely to depend on variety of asbestos and stage of processing. Preliminary results are not in conflict with experimental data suggesting that asbestosis might be related to the mass of airborne dust and primary malignant mesothelial tumors to exposure to fibres in a specific range of fibre diameter and length.
本文描述了一项初步调查的结果，该调查旨在描述在各种生产、加工和处理温石棉、铁石棉及青石棉的行业中，空气中纤维的物理参数、长度、长径比、质量和形状。通过核孔膜过滤器收集空气尘埃样本，并采用扫描电子显微镜进行检测。在一家石棉制品厂倾倒原生铁石棉的过程中所收集的空气中纤维，其直径和长度大于在应用铁石棉绝缘材料过程中所收集纤维的直径和长度。在一家石棉纺织厂梳理区收集的温石棉纤维，其直径往往也小于在一家石棉厂干燥和装袋区所收集纤维的直径。纤维尺寸的测量结果表明，使用膜过滤器技术通过光学计数为工人提供的防护程度可能取决于石棉的种类和加工阶段。初步结果与实验数据并不矛盾，这些实验数据表明，石棉肺可能与空气中尘埃的质量有关，而原发性恶性间皮瘤则与暴露于特定直径和长度范围内的纤维有关。
