Francek M A
Department of Geography and Earth Science, Central Michigan University, Mt Pleasant, Michigan 48858, USA.
Environ Pollut. 1992;76(3):251-7. doi: 10.1016/0269-7491(92)90144-y.
Few studies are made on the potential soil Pb burden for a small city in rural environment. Data obtained by atomic absorption spectrophotometry suggest a somewhat weak significant positive relationship (r=0.27) between increased traffic volume and roadside soil Pb content. Median soil Pb levels along the most heavily travelled roads are 320 microg g(-1) while background concentrations are 200 microg g(-1). No significant relationship is found between predominant wind direction and soil Pb content. Zones where cars idle have only slightly elevated Pb levels. Older homes have soil Pb values exceeding 1000 microg g(-1); a significant positive relationship (r=0.59) exists between increasing soil Pb and home age. Schools, which are mainly located away from heavily travelled roads and typically of brick construction, have soil Pb concentrations at background levels. In general, the small city Pb burden is lower than in major urban areas. However, soils around older homes and in special locales, such as salvage yards, have Pb levels comparable to major urban areas.
针对农村环境中的小城市，关于潜在土壤铅负荷的研究较少。通过原子吸收分光光度法获得的数据表明，交通流量增加与路边土壤铅含量之间存在某种程度较弱的显著正相关关系（r = 0.27）。交通流量最大的道路沿线土壤铅含量中位数为320微克/克，而背景浓度为200微克/克。主导风向与土壤铅含量之间未发现显著关系。汽车怠速区域的铅含量仅略有升高。年代较久的房屋土壤铅含量超过1000微克/克；土壤铅含量增加与房屋年代之间存在显著正相关关系（r = 0.59）。学校主要位于远离交通繁忙道路的地方，通常为砖混结构，土壤铅浓度处于背景水平。总体而言，该小城市的铅负荷低于主要城市地区。然而，年代较久房屋周围以及特殊场所（如废品回收站）的土壤铅含量与主要城市地区相当。
