Ortiz L W, Soderholm S C, Valdez F O
Health Safety, and Environment Division, Los Alamos National Laboratory, NM 87545.
Am Ind Hyg Assoc J. 1988 Sep;49(9):451-60. doi: 10.1080/15298668891380060.
Five models of respirator filters were challenged with a chrysotile aerosol, and the asbestos fiber penetration of the media was measured in five experimental series simulating different environmental conditions. Penetration of the facial seal was not evaluated. The penetration of each filter was determined from the ratio of the downstream to upstream concentrations of airborne asbestos fibers as measured by the standard National Institute for Occupational Safety and Health (NIOSH) asbestos fiber counting method P&CAM 239. Penetrations measured in this project and presented are indicative of penetrations of filters used a) fresh from the package, b) after exposure to an organic oil mist, c) after storage at high humidity at room and elevated temperatures, and d) after preexposure to water mist. Penetrations varied between less than 0.1% and 2.7% for filters tested fresh from the package and up to 18% after exposure to simulated field/environmental conditions. The data indicate that each of the filter models tested, except for the high efficiency filter, was affected adversely to some degree by one or more of the simulated field/environmental conditions.
用温石棉气溶胶对五种型号的呼吸器过滤器进行测试，并在五个模拟不同环境条件的实验系列中测量介质的石棉纤维穿透率。未对面部密封的穿透率进行评估。每种过滤器的穿透率由美国国家职业安全与健康研究所（NIOSH）标准石棉纤维计数方法P&CAM 239测量的空气中石棉纤维下游浓度与上游浓度之比确定。本项目测量并呈现的穿透率表明了过滤器在以下情况下的穿透率：a）刚从包装中取出时；b）暴露于有机油雾后；c）在室温和高温高湿度环境下储存后；d）预先暴露于水雾后。刚从包装中取出测试的过滤器穿透率在不到0.1%至2.7%之间，暴露于模拟现场/环境条件后，穿透率高达18%。数据表明，除高效过滤器外，测试的每种过滤器型号在某种程度上都受到一种或多种模拟现场/环境条件的不利影响。
