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| Contamination status assessment of heavy metals from atmospheric dust falls in Yinchuan |
| LIU Zhi-Jian1, ZHANG Xiu2 |
1.Ningxia Institute of Survey and Monitoring of Land and Resources, Yinchuan 750002, China;
2.College of Life Science, North Universities of Nationalities, Yinchuan 750021, China |
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Abstract The authors analyzed the content of Cu,Pb,Zn,Cr,Ni,Mn and Cd in near-surface atmospheric dust-falls in education area,residential area,industrial area,mixing zone and commercial zone in Yinchuan. By using the index of geoaccumulation and potential ecological risk index,the authors evaluated the pollution degree of heavy metals and the ecological hazards caused by them. The results showed that the content of Pb in the mixing zone, industrial area and commercial zone was obviously higher than the soil background. The content of Cr, Ni and Cd in the mixing zone was significantly higher than the background value; Mn content in soil background was the same in various functional areas. Index of Geoaccumulation shows that the pollution degree of heavy metals from high to low was Cu>Zn>Pb>Cd>Cr>Ni>Mn, with the highest being Cu and Zn, whose values reached moderate pollution in the whole sampling period. Pb and Cd reached moderate pollution in the third and fourth sampling periods, Ni and Cr reached moderate pollution in the third sampling period, and Mn didn't cause actual pollution in the whole sampling periods. Heavy metals in samples of dust-falls caused different levels of potential ecological hazards. The potential ecological risk index of Cu, Pb, Cr,Zn,Ni and Mn was slight, but that of Cd in the third and the fourth sampling periods reached strong ecological hazards. In all functional areas, only the mixing zone's potential ecological risk index of heavy metals reached moderate ecological hazard, and all other functional areas belonged to slight ecological hazard classes in each sampling period.
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Received: 19 April 2016
Published: 10 April 2017
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