在巴西,缺乏试图解释特定气候影响的土壤-植物数据,土壤条件,和作物管理对植物吸收和积累重金属的影响。因此,无法获得用于风险评估或用于推导土壤筛选值的土壤-植物关系。我们在这项研究中的目的是建立Cd的经验土壤-植物模型,Cu,Pb,Ni,Zn,为了得出代表潮湿热带地区(如圣保罗州)的适当土壤筛选值,巴西。收集了SP生产区25种蔬菜的土壤和植物样品。在这些土壤样品中发现的金属浓度相对较低。因此,温带地区的数据被纳入我们的研究.对于10种金属和蔬菜组合中的8种,衍生的土壤-植物关系在SP条件下具有良好的性能。Cd的生物富集因子(BCF)值,Cu,Ni,Pb,生菜和镉中的锌,Cu,Pb,在pH5和6的三种暴露情况下测定胡萝卜中的锌。本研究中提出的土壤植物模型和BCF的应用可以成为得出国家土壤质量标准的重要工具。然而,这种方法包括在不同气候条件和土壤类型下评估的数据,需要仔细考虑。
In Brazil, there is a lack of combined soil-plant data attempting to explain the influence of specific climate, soil conditions, and crop management on heavy metal uptake and accumulation by plants. As a consequence, soil-plant relationships to be used in risk assessments or for derivation of soil screening values are not available. Our objective in this study was to develop empirical soil-plant models for Cd, Cu, Pb, Ni, and Zn, in order to derive appropriate soil screening values representative of humid tropical regions such as the state of São Paulo (SP), Brazil. Soil and plant samples from 25 vegetable species in the production areas of SP were collected. The concentrations of metals found in these soil samples were relatively low. Therefore, data from temperate regions were included in our study. The soil-plant relations derived had a good performance for SP conditions for 8 out of 10 combinations of metal and vegetable species. The bioconcentration factor (BCF) values for Cd, Cu, Ni, Pb, and Zn in lettuce and for Cd, Cu, Pb, and Zn in carrot were determined under three exposure scenarios at pH 5 and 6. The application of soil-plant models and the BCFs proposed in this study can be an important tool to derive national soil quality criteria. However, this methodological approach includes data assessed under different climatic conditions and soil types and need to be carefully considered.