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| AN ASSESSMENT OF THE SOIL ENVIRONMENTAL QUALITY IN THE DOWNTOWN AREA OF BAIYIN CITY, GANSU PROVINCE |
| LI Chun-liang1,2, LIU Wen-hui2 |
1. College of Earth Science and Resources, China University of Geosciences, Beijing 100083, China;
2. Gansu Institute of Geological Survey, Lanzhou 730000, China |
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Abstract The distribution and modes of occurrence of Cu, Pb, Zn, Cd and Hg in the soil and their content in the water were analyzed in this paper. It is found that the soil and water of the study area have been heavily polluted by Cu, Pb, Zn, Cd, Hg and other heavy metals. According to the National Environmental Quality Standards for Soil, no places in Baiyin has attained grade Ⅰ of quality of Cd in surface soil, while places of grade Ⅲ,Ⅳ account for 82.39% of the study area, so Cd pollution is very serious. The percentages of grade Ⅲ and above grade Ⅲ of quality of Hg, Pb, Zn and Cu account for 7.35%, 5.59%, 14.67% and 5.71% respectively. A comparison of the average content of heavy metal elements between 2000 and 2007 in Baiyin City reveals that the growth rate of Cu, Pb, Zn, Cd, Hg contamination was significantly and gradually growing. An investigation was made on the sources of Cu, Pb, Zn, Cd and Hg, which shows that the major sources of pollution are non-ferrous metal smelting, processing and heavy chemical industry, followed by coal, garbage and car exhaust emissions.
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Received: 11 August 2011
Published: 10 December 2012
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