Madrid Luis, Díaz-Barrientos Encarnación, Madrid Fernando
Instituto de Recursos Naturales y Agrobiología de Sevilla (CSIC), Ave. Reina Merc. 10, Apartado 1052, 41080 Sevilla, Spain.
Chemosphere. 2002 Dec;49(10):1301-8. doi: 10.1016/s0045-6535(02)00530-1.
Several metals in urban soils of Seville were extracted by two methods, which respectively give estimates of the available and 'quasi total' contents. Although the soils did not show strong heterogeneity in their general properties, high dispersion of the contents in those metals with greater relative availability, Cu, Pb and Zn, as compared to others suggested that pollution with these three metals could occur in some sampling sites. It was shown that the contents in these metals tend to increase as the historic quarters of the city are approached. Using reference values given by the Quebec Ministry of Environment it was shown that those green areas closer to the historic centre present contents in Pb, Zn and particularly Cu that often exceed the acceptable limits for residential, recreational and institutional sites. From background contents for Seville soils estimated from a park located on the outskirts, a pollution load index (PLI) for each sampling site was calculated for the set of these three metals. It was shown that the PLI tends to increase as traffic density increases and as distance from main traffic decreases, but poor regressions were obtained, suggesting that other variables different from traffic should be considered.
采用两种方法对塞维利亚城市土壤中的几种金属进行了提取，这两种方法分别给出了有效含量和“准总量”含量的估计值。尽管这些土壤在总体性质上没有表现出很强的异质性，但与其他金属相比，铜、铅和锌这三种相对有效性较高的金属含量分布较为分散，这表明在一些采样点可能存在这三种金属的污染。结果表明，随着靠近城市的历史街区，这些金属的含量有增加的趋势。利用魁北克环境部给出的参考值表明，那些靠近历史中心的绿地中铅、锌尤其是铜的含量常常超过住宅、娱乐和公共机构用地的可接受限值。根据从位于市郊的一个公园估算出的塞维利亚土壤背景含量，计算了这三种金属在每个采样点的污染负荷指数（PLI）。结果表明，污染负荷指数往往随着交通密度的增加和与主要交通干道距离的减小而增大，但回归效果不佳，这表明应考虑除交通之外的其他变量。
