Department of Chemistry, Maseno University, P.O. Box 333, 40105 Maseno, Kenya.
Bull Environ Contam Toxicol. 2011 Jan;86(1):137-43. doi: 10.1007/s00128-010-0163-1. Epub 2010 Dec 5.
The mean concentrations of Zn, Cu, Cd, Cr and Fe in mosses around Webuye Pan Paper factory were found to be significantly higher than in controls taken from Kakamega, indicating atmospheric contribution from the anthropogenic activities within the factory, shown within a radius of 1 km around the factory. The mean concentrations (μg/g dry weight) in the mosses ranged from 60.9-124.5, 22.6-34.2, 13.3-14.7, 20.1-33.3 and 1,822.4-2,079.2, respectively. The mean concentrations of Pb in mosses sampled from the eastern and western side of the factory were also significantly higher than in controls. The mean concentrations of Zn, Cu, Cd, Cr, Pb and Fe in topsoil samples ranged from 7 (Pb)-2,310 (Fe) mg/kg dry wt, depending on sample means based on site direction, distance from the factory and season. There was no clear variation in metal concentrations in mosses and topsoils with direction from the factory which was consistent with the observed fluctuations in wind direction which changed from south-west in the mornings to north and south-west in the afternoons during sampling.
在韦布尤潘纸业厂周围采集的苔藓样本中，锌、铜、镉、铬和铁的平均浓度明显高于从卡卡梅加采集的对照组，表明工厂内部的人为活动对工厂半径 1 公里范围内的大气造成了影响。苔藓样本中的平均浓度（μg/g 干重）分别为 60.9-124.5、22.6-34.2、13.3-14.7、20.1-33.3 和 1822.4-2079.2。工厂东侧和西侧采集的苔藓样本中铅的平均浓度也明显高于对照组。工厂东侧和西侧采集的苔藓样本中铅的平均浓度也明显高于对照组。取自土壤表层的样本中，锌、铜、镉、铬、铅和铁的平均浓度在 7（铅）-2310（铁）mg/kg 干重之间，这取决于样本平均值、采样点与工厂的距离以及采样季节。在工厂方向上，苔藓和土壤中金属浓度的变化没有明显的规律，这与风向的观测变化一致，风向在采样期间从早上的西南风变为下午的北风和西南风。
