新疆铁门关市绿洲区土壤重金属污染特征及潜在生态风险评价.

The contents of As, Cd, Cr, Cu, Hg, Ni, Pb and Zn in 3 920 surface soil samples from Tiemenguan City were measured. The soil heavy metal status was evaluated by single factor pollution index, geo-accumulation index and potential ecological hazard index, and the sources were discussed. The results showed that the ratios of the contents of heavy metals As, Cd and Cr in topsoil of Tiemenguan City to the background value of Xinjiang topsoil were 1.17, 1.58 and 1.11.The single factor pollution index Cd element had 0.13% slight pollution, the others were clean to still clean; the geo-accumulation index heavy metal Cd had slight, mild and moderate pollution proportions of 52.14%, 1.33% and 0.10%.The single potential ecological hazard coefficient Eri from high to low in order was Cd＞Hg＞As＞Ni＞Pb＞Cu＞Cr＞Zn, and the average value of RI was 112.91,belong to slight ecological hazard.The correlation analysis and principal component analysis showed that topsoil Cr, Cu, Ni and Zn in Tiemenguan City were mainly affected by parent materials, Cd was jointly affected by parent materials and agricultural production, and Cd was the main pollution factor of topsoil in the study area and that had a great contribution to the potential ecological risk of farmland soil, and Cd pollution deserves attention [ABSTRACT FROM AUTHOR]