Pickrell J A, Heber A J, Murphy J P, Henry S C, May M M, Nolan D, Oehme F W, Gillespie J R, Schoneweis D
Department of Clinical Sciences, Abilene Animal Hospital, PA.
Vet Hum Toxicol. 1993 Oct;35(5):421-8.
To define the atmospheres swine confinement operations, we measured concentrations of total and respirable dust particles, ammonia and endotoxin in the nursery and grower areas of 4 swine confinement houses. Increased ventilation in spring-summer relative to that in winter reduced concentrations of large dust particles more rapidly than it did smaller particles or ammonia. The greater decrease in large particles correlating to increased room air velocity may reflect larger particles' momentum causing impaction on surfaces. There was significant spatial variation in the concentration of airborne endotoxin within individual swine rooms and pens reflecting different mixing of large feed and smaller manure particles. Smaller particles had 4-fold higher concentrations of endotoxin than did larger particles, suggesting they had higher fecal material concentrations. Total airborne endotoxin and total suspended particulates correlated to the fraction of functional endotoxin contained in large particles, suggesting that small particles (0.5-2.0 micrometers) collide with large particles (50 micrometers). These data suggest that large non-respirable particles remove smaller respirable particles from indoor atmospheres due to kinematic coagulation.
为了界定猪舍环境，我们测量了4个猪舍保育区和生长区的总尘埃颗粒、可吸入尘埃颗粒、氨气和内毒素的浓度。与冬季相比，春夏季节通风增加，大尘埃颗粒浓度的降低速度比小颗粒或氨气更快。大颗粒浓度的更大降幅与室内空气流速增加相关，这可能反映了大颗粒的动量导致其撞击表面。在单个猪舍和猪栏内，空气中内毒素浓度存在显著的空间差异，这反映了大饲料颗粒和较小粪便颗粒的不同混合情况。较小颗粒的内毒素浓度比较大颗粒高4倍，表明它们含有更高浓度的粪便物质。空气中总内毒素和总悬浮颗粒物与大颗粒中功能性内毒素的比例相关，这表明小颗粒（0.5 - 2.0微米）与大颗粒（50微米）发生了碰撞。这些数据表明，由于动力学凝聚作用，大的不可吸入颗粒从室内空气中去除了较小的可吸入颗粒。
