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| Pollutions and potential ecological risk of heavy metals in soils around waste arsenic-containing alkaline sites |
| Received:December 30, 2016 |
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| KeyWord:soil heavy metals;pollutions assessment;waste arsenic-containing alkaline site;ecological risk |
| Author Name | Affiliation | E-mail | | LI San-zhong | Lengshuijiang Municipal Environmental Protection Bureau, Lengshuijiang 417500, China
Lengshuijiang City Environmental Protection Monitoring Station, Lengshuijiang 417500, China | | | XU Hua-qin | College of Agronomy, Hunan Agricultural University, Changsha 410128, China | xu7541@163.com | | CHEN Jian-an | Lengshuijiang Municipal Environmental Protection Bureau, Lengshuijiang 417500, China | | | LI Jian-sheng | Lengshuijiang Municipal Environmental Protection Bureau, Lengshuijiang 417500, China | | | DAI Zhi-xing | Lengshuijiang Municipal Environmental Protection Bureau, Lengshuijiang 417500, China | | | LIU Guang-ming | Lengshuijiang Municipal Environmental Protection Bureau, Lengshuijiang 417500, China | | | YANG Jing | Lengshuijiang Municipal Environmental Protection Bureau, Lengshuijiang 417500, China | | | ZHAO Jun-long | Lengshuijiang Municipal Environmental Protection Bureau, Lengshuijiang 417500, China | | | WANG Yong | Lengshuijiang Municipal Environmental Protection Bureau, Lengshuijiang 417500, China | |
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| Abstract: |
| It is important to control the spatial distribution and pollution of heavy metals in soil environment, Although the potential ecological risk index method has already been widely applied on the assessment of heavy metals pollution in different types of industrial areas, there are few concerned about heavy metal contents in the surrounding soils of mixed smelting slag(arsenic residue and slag). In this study, arsenic residue in the middle of Hunan Province was sampled and the contents of Hg, As, Pb, Zn, Cd, Cu and Cr of the soil and the soil characteristics were analyzed. The results showed that the average mass fraction of Hg, As, Pb, Zn, Cd, Cu and Cr in the soil were 2.61, 209, 41.3, 209, 3.49, 4.34, 45.7 mg·kg-1. The average contents of Hg, As, Pb, Zn and Cd were 22.5, 13.3, 1.39, 2.21 and 27.7 times than the background value, respectively. The pollution extent of heavy metals in soils by geo-accumulation index(Igeo) showed that the proportion of serious accumulation of pollution of single Igeo of Hg, As, Cd was 25%, 6.25%, 18.8% respectively. This assessment shows that the average potential ecological risk index of all the samples is above the conderable ecological risk level, of which 62.5% is very high ecological risk, and the area is in very high ecological risk graded. The results also showed that Hg, As, Pb, Cu, Zn and Cd are mainly derived from mining, smelting and transportation. While Cr is derived from soil parent material. |
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