Henry N W, Wilhelme R S
Am Ind Hyg Assoc J. 1979 Dec;40(12):1017-22. doi: 10.1080/15298667991430659.
Experimental breakthrough times obtained from evaluating respiratory canisters to acrylonitrile vapors at various concentrations are presented and compared to estimated breakthrough times calculated from Nelson's equation for organic vapors adsorbed on activated carbon. The slope of the regression for breakthrough time vs. concentration of acrylonitrile was found to compare closely to that derived from Nelson's equation in the concentration range from 30 to 1000 ppm. This demonstrates that the equation is capable of predicting breakthrough times for organic compounds which, like acrylonitrile, have low molecular weights and boiling points. This ability to predict service life is also influenced by other important factors such as relative humidity and amount of activated carbon packed in a canister. Results of this evaluation illustrate the need to determine breakthrough times for compounds under controlled conditions similar to those encountered in the field, especially at low concentrations. Industrial hygienists should use experimentally derived breakthrough times to predict the service life of an air purifying device if they are available.
本文给出了在不同浓度下评估呼吸滤毒罐对丙烯腈蒸气的实验突破时间，并将其与根据尼尔森方程计算得出的、用于吸附在活性炭上的有机蒸气的估计突破时间进行了比较。发现在30至1000 ppm的浓度范围内，突破时间与丙烯腈浓度的回归斜率与从尼尔森方程得出的斜率非常接近。这表明该方程能够预测像丙烯腈这样具有低分子量和低沸点的有机化合物的突破时间。这种预测使用寿命的能力还受到其他重要因素的影响，如相对湿度和滤毒罐中填充的活性炭量。该评估结果表明，需要在类似于现场遇到的受控条件下，特别是在低浓度下，确定化合物的突破时间。如果有实验得出的突破时间，工业卫生学家应使用这些时间来预测空气净化设备的使用寿命。
