Cohen H J
Olin Corporation, New Haven, CT 06511.
Am Ind Hyg Assoc J. 1993 Aug;54(8):432-9. doi: 10.1080/15298669391354928.
Results of a field study that estimated the service lives of several different brands of organic-vapor respirator cartridges for nitroglycerin are presented. Respirator carbon tubes (RCTs) were used to sample in a workplace where gun powder was manufactured and where nitroglycerin levels varied from approximately 0.1-0.7 mg/m3. Tenax adsorbent tubes were used to monitor for nitroglycerin upstream and downstream of RCTs and were subsequently analyzed by a gas-chromatography method. A series of 10 trials failed to find evidence of nitroglycerin breakthrough. Estimates of the minimum service lives of respirator cartridges varied from 7-81 hours for nitroglycerin levels of 1.0 mg/m3, 10 times the current Occupational Safety and Health Administration Permissible Exposure Level. One trial specifically examined the potential of nitroglycerin to prematurely break through a cartridge due to bed migration, and results failed to indicate this as a potential problem. A field validation of the Tenax adsorbent tube method for nitroglycerin monitoring resulted in an accuracy of +/- 77-88% at the 95% confidence level. An unexpected finding was that up to 10% of the ambient nitroglycerin collected was adsorbed to an aerosol. This finding led to the recommendation that the addition of a prefilter to an organic vapor cartridge may be required when using air-purifying respirators to protect workers from some nitroglycerin exposures.
本文介绍了一项实地研究的结果，该研究估算了几种不同品牌的用于硝化甘油的有机蒸气呼吸器滤毒罐的使用寿命。在一个生产火药且硝化甘油浓度约为0.1 - 0.7毫克/立方米的工作场所，使用呼吸器碳管（RCT）进行采样。使用Tenax吸附管监测RCT上下游的硝化甘油，随后通过气相色谱法进行分析。一系列10次试验未发现硝化甘油穿透的证据。对于硝化甘油浓度为1.0毫克/立方米（是当前职业安全与健康管理局允许接触水平的10倍）的情况，呼吸器滤毒罐的最短使用寿命估计为7 - 81小时。一项试验专门研究了由于床层迁移导致硝化甘油过早穿透滤毒罐的可能性，结果未表明这是一个潜在问题。对用于硝化甘油监测的Tenax吸附管方法进行的实地验证在95%置信水平下的准确度为±77 - 88%。一个意外发现是，所收集的环境硝化甘油中高达10%被吸附到气溶胶上。这一发现导致建议，在使用空气净化呼吸器保护工人免受某些硝化甘油暴露时，可能需要在有机蒸气滤毒罐上添加预过滤器。
