Variability in protection afforded by half-mask respirators against styrene exposure in the field.
Variability in protection afforded by half-mask respirators against styrene exposure in the field.
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半面罩呼吸器针对现场苯乙烯暴露提供的保护存在差异。
DOI：
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发表时间：
1990
期刊：
影响因子：
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通讯作者：
R. Spear
中科院分区：
文献类型：
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作者：
K. Galvin;S. Selvin;R. Spear
对13名从事玻璃纤维增强产品生产的空气净化型半面罩呼吸器的呼吸区和面罩内的苯乙烯浓度进行了3-6个1小时的测量。这些数据被用来估计呼吸器提供的保护。为了得到这些估计值，有必要对口罩内测量的苯乙烯在肺内滞留的浓度进行修正。工人被归类为喷雾工或其他不直接进行喷洒作业的生产线工人。差异分析显示，没有证据表明这两个工作类别的呼吸器所提供的保护水平存在差异。第二次方差分析表明，在不同的佩戴期，工人之间以及对单个工人的保护是不同的。工人间几何标准差(GSD)为1.92，工人内部共同GSD为2.93，总GSD为3.51。拥有类似防护措施的佩戴者中，预计有一半的人长期平均工作场所防护系数将超过44，低于该值的一半。对保护中工人之间和工人内部的可变性的观察表明，在规定最大使用浓度时，必须考虑到这两个可变性来源。
Concentrations of styrene were measured in the breathing zone and inside the facepiece of air-purifying half-mask respirators of 13 workers for three to six 1-hr periods while they were engaged in the production of fiberglass-reinforced products. These data were used to estimate the protection afforded by the respirators. In arriving at these estimates, it was necessary to correct the concentration measured inside the mask for pulmonary retention of styrene by the workers. Workers were classified as sprayers or as other production line workers not directly carrying out spraying operations. An analysis of variance showed no evidence of differences in the level of protection afforded by the respirators between the two job classes. A second analysis of variance showed that protection varied between workers as well as for a single worker during different wearing periods. The geometric standard deviation (GSD) between workers was 1.92, the common within-worker GSD was 2.93, and the total GSD was 3.51. One-half of a population of wearers with similar protection would be expected to experience long-term average workplace protection factors in excess of 44 and one-half below that value. The observation of between-worker and within-worker variability in protection indicates that both sources of variability have to be taken into account in the specification of maximum use concentrations.