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Wang M, Guo Z, Du J, Lu H, Liu L, Wang T, Pan S. Assessing the hepatotoxicity of phosphogypsum leachate in zebrafish (Danio rerio). Sci Total Environ 2024; 926:172018. [PMID: 38547988 DOI: 10.1016/j.scitotenv.2024.172018] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/15/2023] [Revised: 03/01/2024] [Accepted: 03/25/2024] [Indexed: 04/07/2024]
Abstract
The improper disposal of large amounts of phosphogypsum generated during the production process of the phosphorus chemical industry (PCI) still exists. The leachate formed by phosphogypsum stockpiles could pose a threat to the ecological environment and human health. Nevertheless, information regarding the harmful effects of phosphogypsum leachate on organisms is still limited. Herein, the physicochemical characteristics of phosphogypsum leachate were analyzed, and its toxicity effect on zebrafish (Danio rerio), particularly in terms of hepatotoxicity and potential mechanisms, were evaluated. The results indicated that P, NH3-N, TN, F-, As, Cd, Cr, Co, Ni, Zn, Mn, and Hg of phosphogypsum leachate exceeded the V class of surface water environmental quality standards (GB 3838-2002) to varying degrees. Acute toxicity test showed that the 96 h LC50 values of phosphogypsum leachate to zebrafish was 2.08 %. Under exposure to phosphogypsum leachate, zebrafish exhibited concentration-dependent liver damage, characterized by vacuolization and infiltration of inflammatory cells. The increased in Malondialdehyde (MDA) content and altered activities of antioxidant enzymes in the liver indicated the induction of oxidative stress and oxidative damage. The expression of apoptosis-related genes (P53, PUMA, Caspase3, Bcl-2, and Bax) were up-regulated at low dosage group and down-regulated at medium and high dosage groups, suggesting the occurrence of hepatocyte apoptosis or necrosis. Additionally, phosphogypsum leachate influenced the composition of the zebrafish gut microbiota by reducing the relative abundance of Bacteroidota, Aeromonas, Flavobacterium, Vibrio, and increasing that of Rhodobacter and Pirellula. Correlation analysis revealed that gut microbiota dysbiosis was associated with phosphogypsum leachate-induced hepatotoxicity. Altogether, exposure to phosphogypsum leachate caused liver damage in zebrafish, likely through oxidative stress and apoptosis, with the intestinal flora also playing a significant role. These findings contribute to understanding the ecological toxicity of phosphogypsum leachate and promote the sustainable development of PCI.
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Affiliation(s)
- Min Wang
- School of Public Health, the Key Laboratory of Environmental Pollution Monitoring and Disease Control, Ministry of Education, Guizhou Medical University, Guian New Area, Guizhou 561113, China
| | - Ziyu Guo
- School of Public Health, the Key Laboratory of Environmental Pollution Monitoring and Disease Control, Ministry of Education, Guizhou Medical University, Guian New Area, Guizhou 561113, China
| | - Jiangfeng Du
- School of Public Health, the Key Laboratory of Environmental Pollution Monitoring and Disease Control, Ministry of Education, Guizhou Medical University, Guian New Area, Guizhou 561113, China
| | - Hongliang Lu
- School of Public Health, the Key Laboratory of Environmental Pollution Monitoring and Disease Control, Ministry of Education, Guizhou Medical University, Guian New Area, Guizhou 561113, China
| | - Long Liu
- School of Basic Medicine, Guizhou Medical University, Guian New Area, Guizhou 561113, China; Key Laboratory of Microbiology and Parasitology of Institution of Higher Learning of Guizhou, Guian New Area, Guizhou 561113, China
| | - Tao Wang
- School of Basic Medicine, Guizhou Medical University, Guian New Area, Guizhou 561113, China; Key Laboratory of Microbiology and Parasitology of Institution of Higher Learning of Guizhou, Guian New Area, Guizhou 561113, China
| | - Sha Pan
- School of Public Health, the Key Laboratory of Environmental Pollution Monitoring and Disease Control, Ministry of Education, Guizhou Medical University, Guian New Area, Guizhou 561113, China.
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Cheng JH, Tang XY, Guan Z, Liu C. Occurrence of antibiotic resistome in farmland soils near phosphorus chemical industrial area. Sci Total Environ 2021; 796:149053. [PMID: 34328884 DOI: 10.1016/j.scitotenv.2021.149053] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/14/2021] [Revised: 07/09/2021] [Accepted: 07/11/2021] [Indexed: 06/13/2023]
Abstract
Heavy metal pollution of soil surrounding phosphorus chemical industry has been a long-concerned problem; however, the occurrence of antibiotic resistance genes (ARGs) in farmland soils in its vicinity remains unexplored. In this study, variations of heavy metals, ARGs, mobile genetic elements (MGEs), and microbiome in surface soils of farmland along the prevailing downwind direction of a phosphorus chemical industrial zone were investigated. Cadmium (Cd) contents in soils close to the industrial zone (≤ 500 m away) were statistically higher than those at greater distances (1000 to 4000 m). A comparable ARG diversity was observed across soils, while the relative abundance of ARGs decreased markedly with increasing distance in the range of 1000 m. The soil in closest proximity to the industrial zone (20 m away) exhibited divergent compositions of ARGs, MGEs, and bacterial community from the other soils at farther locations (500 to 4000 m away). Variation partitioning analysis revealed that Cd and MGEs levels were the primary factors controlling ARG distribution. Structural equation modeling further indicated that the direct effect of Cd on ARG abundance was stronger than its indirect effect via affecting MGEs and microbiome. The observed prevalence of ARGs in farmland soils highlights the necessity of including resistome in the framework for environmental risk assessment of phosphorus chemical manufacturing.
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Affiliation(s)
- Jian-Hua Cheng
- State Key Laboratory of Subtropical Silviculture, Zhejiang A&F University, Hangzhou 311300, China; Key Laboratory of Mountain Surface Processes and Ecological Regulation, Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041, China
| | - Xiang-Yu Tang
- State Key Laboratory of Subtropical Silviculture, Zhejiang A&F University, Hangzhou 311300, China; Key Laboratory of Mountain Surface Processes and Ecological Regulation, Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041, China.
| | - Zhuo Guan
- Key Laboratory of Mountain Surface Processes and Ecological Regulation, Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041, China
| | - Chen Liu
- Key Laboratory of Mountain Surface Processes and Ecological Regulation, Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041, China
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