|
| Evaluation of heavy metal pollution characteristics and the potential risks of soil in the Dongjiang River basin |
| Received:October 27, 2021 |
| View Full Text View/Add Comment Download reader |
| KeyWord:Dongjiang River basin;heavy metal;land use type;risk evaluation;spatial distribution |
| Author Name | Affiliation | E-mail | | HUANG Zhiwei | 1. State Environmental Protection Key Laboratory of Water Environmental Simulation and Pollution Control, Guangdong Key Laboratory of Water and Air Pollution Control, South China Institute of Environmental Sciences, Ministry of Ecology and Environment of the People's Republic of China, Guangzhou 510530, China | | | LI Wenjing | 1. State Environmental Protection Key Laboratory of Water Environmental Simulation and Pollution Control, Guangdong Key Laboratory of Water and Air Pollution Control, South China Institute of Environmental Sciences, Ministry of Ecology and Environment of the People's Republic of China, Guangzhou 510530, China | | | LI Weijie | 1. State Environmental Protection Key Laboratory of Water Environmental Simulation and Pollution Control, Guangdong Key Laboratory of Water and Air Pollution Control, South China Institute of Environmental Sciences, Ministry of Ecology and Environment of the People's Republic of China, Guangzhou 510530, China | | | MAO Yupeng | 1. State Environmental Protection Key Laboratory of Water Environmental Simulation and Pollution Control, Guangdong Key Laboratory of Water and Air Pollution Control, South China Institute of Environmental Sciences, Ministry of Ecology and Environment of the People's Republic of China, Guangzhou 510530, China | | | FANG Huaiyang | 1. State Environmental Protection Key Laboratory of Water Environmental Simulation and Pollution Control, Guangdong Key Laboratory of Water and Air Pollution Control, South China Institute of Environmental Sciences, Ministry of Ecology and Environment of the People's Republic of China, Guangzhou 510530, China | | | DU Hongwei | 1. State Environmental Protection Key Laboratory of Water Environmental Simulation and Pollution Control, Guangdong Key Laboratory of Water and Air Pollution Control, South China Institute of Environmental Sciences, Ministry of Ecology and Environment of the People's Republic of China, Guangzhou 510530, China | | | ZENG Fantang | 1. State Environmental Protection Key Laboratory of Water Environmental Simulation and Pollution Control, Guangdong Key Laboratory of Water and Air Pollution Control, South China Institute of Environmental Sciences, Ministry of Ecology and Environment of the People's Republic of China, Guangzhou 510530, China | | | LIN Shu | 1. State Environmental Protection Key Laboratory of Water Environmental Simulation and Pollution Control, Guangdong Key Laboratory of Water and Air Pollution Control, South China Institute of Environmental Sciences, Ministry of Ecology and Environment of the People's Republic of China, Guangzhou 510530, China | linshu@scies.org |
|
| Hits: 1134 |
| Download times: 759 |
| Abstract: |
| In order to investigate the distribution characteristics of heavy metals in the soil, the influence of land use and the sources of heavy metals from the watershed scale were investigated. In this paper, Zn, Cr, Pb, Cu, and As concentrations were measured in the surface soil(0~30 cm) of areas with different land uses in the basin wide of the Dongjiang River basin. Using mathematical statistics, geostatistical methods, a pollution index, and the risk index method, we analyzed the characteristics of heavy metal contents in soils from the whole river basin, across different land use types, and evaluated their pollution and potential ecological risks. The spatial distribution of heavy metal content and pollution risk was studied using kriging interpolation. Sources of heavy metals were also explored. The results show that compared with the background concentrations from 1986 to 1990, the surface soils in the Dongjiang River basin show different degrees of cumulative increase. There are large differences in the soil heavy metal content of different land types, all of which are of medium variability, and in general, the content of various types of heavy metals in the middle and upper reaches is relatively high, with the Longmen and Heping-Longchuan-Xunwu areas being particularly prominent. The average value of all types of heavy metals in the Dongjiang basin is lower than the national secondary standard, and the single factor index evaluation shows that the pollution level is safe. The comprehensive index evaluation of the Nemero index shows that the pollution level is safe and close to light pollution, and the average comprehensive potential ecological risk index of the basin is 55.6, which is low risk. Soil heavy metals in the Dongjiang basin come from two main sources:anthropogenic and natural sources. Pb, Zn, and As may be influenced by both anthropogenic and natural sources, such as industrial effluent discharge, pesticides, fertilizers, mining, and transportation, while Cr and Cu are likely more influenced by natural sources based on soil parent material and atmospheric deposition. This study indicates that soil heavy metals in the study area have different degrees of cumulative upward trends, but the overall pollution risk is low. The content of heavy metals in soils varies widely among different site types, and is generally higher in the middle and upper reaches of the Longmen and Heping-Longchuan-Xunwu areas. Soil heavy metals in the Dongjiang basin come from two main sources, anthropogenic and natural sources, and some heavy metals exist in similar source pathways. |
|
|
|
