摘要：Evaluation of the local environmental background is essential for the environmental management. In this study, statistical and spatial analyses have been applied for the aluminum and lead concentrations of 127 surface soil samples in the farmland of the urban-rural joint area of Suzhou, Anhui province, China, for the evaluation of environmental background. The results show that these soil samples have average enrich factors lower than 1 for both aluminum and lead, together with their low values of coefficient of variation and p-values of normal distribution test, indicating that there is no and slightly anthropogenic contributions for the aluminum and lead, respectively. Some hotspots and anomaly areas have been identified based on the spatial distribution and the spatial autocorrelation analysis, and the transportation related gasoline burning is identified to be the main source for releasing lead into the environment. The environmental background values have been calculated to be 2.18-3.27% and 7.74-18.4 mg/kg for aluminum and lead based on the spatial autocorrelation analysis, respectively, similar to the results obtained by statistical analyses, however, the former based on the "no mutation" relative to its nearby samples, whereas the latter based on the hypothesis of normal distribution of background concentrations.
