Ojima J, Homma K
National Institute of Industrial Health, Kawasaki, Japan.
Sangyo Igaku. 1994 Jul;36(4):203-10. doi: 10.1539/joh1959.36.4_203.
In this study, our point of view is to generate monodisperse fiber aerosols stably from liquid suspension by using an ultrasonic nebulizer. To fulfill this purpose, we set standard operating conditions in advance by measuring relative humidity of the air flowed from the apparatus, and then generated three kinds of fiber aerosols (potassium titanate whisker, amosite, chrysotile) to investigate this method. The results which were obtained are as follows. 1) Nebulizing method is useful for generating fiber aerosols stably. The longest term obtained in stable generation was as much as 6 hours, and the count median length (CML) of the fibers were 1-2 micrometer. 2) The aerosol concentration ranged from 0.2 to 3.4 mg/m3, and the flow rate of carrier air was found most effective to control aerosol concentration and length. 3) To shift the concentration of liquid suspension was not always effective to shift the aerosol concentration, and too much concentrated suspension tended to cause fiber co-aggregation. 4) Primary fiber sample should be fine to generate fiber aerosol stably, because large-sized fibers will disturb the aerosol generation.
在本研究中，我们的观点是通过使用超声雾化器从液体悬浮液中稳定地产生单分散纤维气溶胶。为实现这一目的，我们通过测量从装置流出的空气的相对湿度预先设定标准操作条件，然后产生三种纤维气溶胶（钛酸钾晶须、铁石棉、温石棉）来研究该方法。得到的结果如下。1）雾化方法对于稳定地产生纤维气溶胶是有用的。稳定产生中获得的最长时间长达6小时，并且纤维的计数中位长度（CML）为1 - 2微米。2）气溶胶浓度范围为0.2至3.4毫克/立方米，并且发现载气流量对控制气溶胶浓度和长度最有效。3）改变液体悬浮液的浓度并不总是有效地改变气溶胶浓度，并且过于浓缩的悬浮液倾向于导致纤维聚集。4）初级纤维样品应该精细以便稳定地产生纤维气溶胶，因为大尺寸的纤维会干扰气溶胶的产生。
