Occupational and Environmental Health, The University of Iowa, Iowa City, Iowa 52242, USA.
J Occup Environ Hyg. 2010 Jan;7(1):7-13. doi: 10.1080/15459620903327970.
A task-based analysis of personal airborne dust exposures was performed in two swine confinement facilities used to house sows and their litters. Airborne particulate levels were assessed during summer, winter, and spring. Personal aerosol measurements of workers were made with a photometer every 15 sec and corrected to compare with an integrated concentration measurement made with a co-located IOM inhalable dust sampler. Task type and time period were recorded by the workers over an 8-hr work shift. There was a significant difference in dust concentrations between seasons (p < 0.001), with winter months providing the highest levels (geometric mean = 3.76 mg/m(3)). The application of a general linear model of log-transformed task concentrations relative to site, season, and task demonstrated significant differences (P < 0.001) among all three covariates. Tasks performed near moving animals, especially the weaning process, resulted in the greatest concentrations. These results indicate the need to evaluate the concentration levels for separate tasks during multi-task work shifts, such as swine rearing, to optimize efforts to minimize exposures by focusing on high-concentration tasks.
本研究对两个用于饲养母猪及其幼崽的密闭式养猪场进行了基于任务的个体空气粉尘暴露分析。在夏季、冬季和春季评估了空气中的颗粒物水平。使用光度计每 15 秒对工人进行一次气溶胶测量，并进行校正，以与位于同一位置的 IOM 可吸入粉尘采样器进行的积分浓度测量进行比较。工人在 8 小时的轮班工作中记录了任务类型和时间段。不同季节之间的粉尘浓度存在显著差异（p<0.001），冬季的水平最高（几何平均值=3.76mg/m3）。对相对于地点、季节和任务的对数转换任务浓度进行一般线性模型的应用表明，所有三个协变量之间存在显著差异（P<0.001）。在靠近移动动物的地方进行的任务，特别是断奶过程，会导致最高的浓度。这些结果表明，在多任务轮班工作中，例如养猪，需要评估单独任务的浓度水平，以优化努力，通过专注于高浓度任务来尽量减少暴露。
