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| SPECIATION CHARACTERISTICS AND CONTENT OF CHROMIUM IN DIFFERENT MEDIA AROUND A CHEMICAL FACTORY |
| JIA Zhong-min1, YANG Le-chao1, ZHOU Jiao1, FENG Han-ru2, YAN Ming-shu1, LI Wu-bin1, GONG Yuan-yuan1, ZHANG Mao-zhong1 |
1. Southeast Sichuan Geological Group, Chongqing Bureau of Geology and Minerals Exploration, Chongqing 400038;
2. Chongqing Fengmingshan Middle School, Chongqing 400037 |
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Abstract Speciation characteristics and content of chromium (Cr) in different media around a chemical factory were studied to understand Cr pollution status in soils and its bio-availability. The media included soil, dust fall near the surface, bottom sludge, waste residue, and water. The sheet abnormal chromium areas centered at the chemical factory were found. The Cr content of waste residue and some bottom sludge reached one hundred or thousands times the soil background value. The Cr concentrations of topsoil and atmospheric dust samples were similar when the distance was taken into account, suggesting that the dust fall of the chemical factory is the main source of large-area pollution of Cr anomaly. Chromium in media exists mainly in residual speciation, but the average proportion of bio-available Cr in waste residue and potential bio-available Cr in some bottom sludge is 9.52% and 51.08%, respectively. Chromium has a significant negative effect on the health of organisms in the study area due to its high concentration and biological activity. Thus, it is essential to take measures to protect the ecological environment and plan the reasonable land use.
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Received: 15 November 2013
Published: 10 April 2014
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