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| Pollution assessment and enrichment characteristics of heavy metals in farmland vegetables near a mining area |
| Received:December 19, 2019 |
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| KeyWord:farmland soil;vegetables;heavy metals;pollution assessment;pollutant enrichment characteristics;accumulation capacity |
| Author Name | Affiliation | E-mail | | TU Chun-yan | Guangxi Bossco Environmental Protection Technology Co, Ltd, Nanning 530007, China
Hunan Bossco Environmental Protection Technology Co., Ltd, Changsha 410000, China | | | CHEN Ting-ting | Guangxi Bossco Environmental Protection Technology Co, Ltd, Nanning 530007, China
Hunan Bossco Environmental Protection Technology Co., Ltd, Changsha 410000, China | | | LIAO Chang-jun | Guangxi Bossco Environmental Protection Technology Co, Ltd, Nanning 530007, China | hjxfy@bossco.cc | | CAO Fei-shu | Guangxi Bossco Environmental Protection Technology Co, Ltd, Nanning 530007, China | | | ZHANG Chao-lan | Guangxi Bossco Environmental Protection Technology Co, Ltd, Nanning 530007, China
College of Resources, Environment and Materials, Guangxi University, Nanning 530004, China | | | ZHOU Yong-xin | Guangxi Bossco Environmental Protection Technology Co, Ltd, Nanning 530007, China
Hunan Bossco Environmental Protection Technology Co., Ltd, Changsha 410000, China | | | XIE Tian | Guangxi Bossco Environmental Protection Technology Co, Ltd, Nanning 530007, China | |
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| Abstract: |
| To clarify the pollution of different vegetables in a farmland near the Nandan mining area in China, varieties of vegetables suitable for planting in the area were selected to reduce ecological risks. Based on in situ sampling, the Cd, As, and Pb pollution status and enrichment characteristics in the edible parts of these vegetables were evaluated and compared using a single-factor pollution index, comprehensive pollution index, bioconcentration factor, and systematic cluster analysis. Leaf vegetables and radishes were also selected to analyze heavy metal enrichment in different plant parts. The results showed that the farmland soil in this area was heavily polluted with Cd and As, and the edible parts of the vegetables were mainly polluted with Cd. The Cd-enrichment capacity of different vegetables followed the order of:leafy vegetables > solanaceous vegetables > root vegetables > gourds > cowpea vegetables. The order of the enrichment capacity of similar species, namely leafy, cowpea, and solanaceous vegetables, for the three heavy metals studied was Cd > Pb > As, and the general trend of the enrichment capacity of root vegetables and gourd vegetables for heavy metals was Cd>As>Pb. Among these vegetables,the heat-resistant sharp-leaf lettuce exhibited the strongest capacity for Cd and Pb enrichment, while ginger had the strongest capacity for As-enrichment. Based on an analysis of the accumulation of heavy metals in different parts of leafy vegetables and radishes, the trends of Cd, As, and Pb concentrations showed that heavy metal concentrations in the edible parts of the plants were lower than those within the inedible parts. Overall, different species of vegetables had different enrichment capacities for heavy metals, and vegetables were more susceptible to Cd contamination. Among the analyzed vegetables, leafy vegetables had the strongest capacity to accumulate Cd. Therefore, to ensure the safety of those consuming vegetables grown in this area, leafy vegetables should not be planted. Furthermore, the study recommend the growing of momordica charantia, taro pumpkins, seven-inch ginseng carrots, purple sweet potatoes, and other gourd or root vegetables. |
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