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| Assessment of trace element pollution of farmland soils in the oases along the lower reaches of the Kaidu River and its potential health risks |
| Received:January 09, 2018 |
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| KeyWord:farmland soils;trace elements;health risk assessment;oasis;Kaidu River |
| Author Name | Affiliation | E-mail | | Ajigul Mamut | College of Geographical Science and Tourism, Xinjiang Normal University, Urumqi 830054, China | | | Mamattursun Eziz | College of Geographical Science and Tourism, Xinjiang Normal University, Urumqi 830054, China | oasiseco@126.com | | Anwar Mohammad | College of Chemistry and Chemical Engineering, Xinjiang University, Urumqi 830046, China | | | Dilshat Ismayil | College of Geographical Science and Tourism, Xinjiang Normal University, Urumqi 830054, China | |
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| Abstract: |
| From the oases along the lower reaches of the Kaidu River, 98 farmland soil samples were collected, and their concentrations of As, Cd, Cr, Cu, Ni, Pb, and Zn were determined. The contamination level of trace elements of the farmland soils was analyzed based on the Geoaccumulation Index (Igeo), and the risk to human health was assessed using the US EPA Health Risk Assessment Model. The results obtained indicated that the average contents of Zn in the farmland soils fell in the light contamination range; Cd and Pb fell in the slight contamination range while As, Cr, Cu, and Ni fell in the no contamination range. The average noncarcinogenic risk quotient (HQ) value for each trace element in the farmland soils, was as follows:HQPb > HQAs > HQCr > HQCd > HQCu > HQNi > HQZn. The HQ and noncarcinogenic risk index (HI) were lower than 1, which within the limit of acceptable risk. The HI values of trace elements in the farmland soils were lower for children than for adults. The individual carcinogenic health risk index (CR) of As, via three exposure pathways for both adults and children, was higher than that of Pb. The CR and total carcinogenic health risk index (TCR) values were lower than 10-4, which means that they are within the limit of acceptable risk, and the TCR values of trace elements for children were higher than those for adults. As, Cr, and Pb were the main noncarcinogenic risk factors, whereas As was the main carcinogenic risk factor for farmland soils of the study area. |
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