|
| Pollution status and bioavailability of heavy metals in soils of a typical black shale area |
| Received:May 07, 2018 |
| View Full Text View/Add Comment Download reader |
| KeyWord:geogenic high background;black shale;heavy metals;distribution characteristic;bioavailability |
| Author Name | Affiliation | | ZHAO Wan-fu | Key laboratory of surficial Geochemistry Ministry of Education, Nanjing University, Nanjing 210023, China
Ningxia Institute of Land Resources Survey and Monitor, Yinchuan 750002, China | | SONG Yin-xian | College of Environment, Hohai University, Nanjing 210098, China | | GUAN Dong-xing | Key laboratory of surficial Geochemistry Ministry of Education, Nanjing University, Nanjing 210023, China | | MA Qiang | Key laboratory of surficial Geochemistry Ministry of Education, Nanjing University, Nanjing 210023, China | | GUO Chao | Key laboratory of surficial Geochemistry Ministry of Education, Nanjing University, Nanjing 210023, China | | WEN Yu-bo | Key laboratory of surficial Geochemistry Ministry of Education, Nanjing University, Nanjing 210023, China | | JI Jun-feng | Key laboratory of surficial Geochemistry Ministry of Education, Nanjing University, Nanjing 210023, China |
|
| Hits: 2389 |
| Download times: 2265 |
| Abstract: |
| Black shale is rich in heavy metals, which may be liberated to the environment and cause soil pollution. In this paper, the pollution status, sources, distribution characteristics and bioavailability of heavy metal in soils derived from Cambrian black shales in Zhejiang were investigated from an ecological geochemistry perspective. The results showed that Zn concentration, Hg, Cd, Cu and As in soils of the study area exceeded the maxium accessible limits, by a factor of 67.81%, 7.81%, 7.18%, 4.68% and 1.87%, respectively, whereas Se concentration, Ni, Pb and Cr remained below the limits. By comparing the distribution characteristics of both black shale and heavy metals in soils, good match between the two was found. The released heavy metals(Cd, Cu, Se, Ni and Zn) from the weathering of black shale parent materials contributed considerably to their accumulation and pollution in soils. Heavy metals of different sources resulted in distinct bioavailability in soils, following the order Cd > Zn > Se > Ni > As > Pb > Cu > Cr. The existence of Cd and other elements of high bioavailability in soils of the study area may cause harm to the local ecological environment. |
|
|
|
