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| Soil heavy metal pollution and ecological health risk assessment of large-scale farms in Jiangsu area |
| Received:February 21, 2024 |
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| KeyWord:large-scale farm;soil heavy metals;pollute;ecological health;risk |
| Author Name | Affiliation | | GU Jia | Jiangsu Soil Pollution Control Engineering Technology Research Center, Nanjing 210001, China
Institute of Geochemical Exploration and Marine Geological Survey, ECE, Nanjing 210001, China | | XIN Dongshuai | Jiangsu Soil Pollution Control Engineering Technology Research Center, Nanjing 210001, China
Institute of Geochemical Exploration and Marine Geological Survey, ECE, Nanjing 210001, China | | JIANG Cidong | Jiangsu Soil Pollution Control Engineering Technology Research Center, Nanjing 210001, China
Institute of Geochemical Exploration and Marine Geological Survey, ECE, Nanjing 210001, China | | SU Haitao | Jiangsu Soil Pollution Control Engineering Technology Research Center, Nanjing 210001, China
Institute of Geochemical Exploration and Marine Geological Survey, ECE, Nanjing 210001, China | | ZHAI Hong | Jiangsu Soil Pollution Control Engineering Technology Research Center, Nanjing 210001, China
Institute of Geochemical Exploration and Marine Geological Survey, ECE, Nanjing 210001, China |
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| Abstract: |
| In order to identify the soil heavy metal pollution and ecological health risks of large-scale farms, 299 surface soil（0-20 cm） samples were collected from 69 large-scale farms in Jiangsu area. The contents of Cu, As, Cd, Cr, Hg, Ni, Pb and Zn were analyzed and determined. The pollution degree, potential ecological risk and health risk of heavy metals in soil were evaluated by pollution index, geoaccumulation index, potential ecological risk index and health risk assessment model. The results showed that the average values of Ni, Cu, Cd, Pb, Zn and As in the surface soil of the study area were higher than the regional background values. The contents of heavy metals in the soil of different breeding types and different regions were significantly different. The average values of Zn, Cu and Cd in the surface soil of pig farms were the highest, and the average values of Cr, Pb and Ni in the surface soil of chicken farms were the highest. The contents of heavy metals in the manure stacking area and livestock and poultry activity area were higher than those in the feed stacking area. The evaluation results of pollution index showed that the Nemerow pollution index of soil in the study area was 0.21-1.08, mild pollution accounted for 0.33%, Zn was the main contribution factor, and the pollution point was located in the manure stacking area.The results of the cumulative index evaluation showed that there were different degrees of heavy metal accumulation in the soil of some farms. Among them, Zn, Cu, Cd and As reached light to medium pollution points, accounting for 23.41%, 13.38%, 10.03% and 9.36%, respectively. The results of ecological risk index evaluation showed that the comprehensive ecological risk index of soil in the study area ranged from 55.14 to 277.71, and the ecological risk was in the low-medium risk range. Among them, 26.42% of the points had medium risk of Cd, and 6.35% of the points had medium-high risk of Hg. The results of health risk assessment showed that the accumulation of heavy metals in the soil of the study area did not pose a non-carcinogenic health risk to the human body, and the carcinogenic risk was also within an acceptable range. |
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