期刊
CHEMOSPHERE
卷 262, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2020.127768
关键词
Heavy metals; Risk assessment; Antimicrobial resistant; E. coli
资金
- Fund of China's National Natural Science Foundation [41773085, 41503100]
- Shandong Agricultural Major Application Technology Innovation [SD2019XM009]
- Key Research and Development Program of Shandong Province (Important Science and Technology Innovation Project) [2019JZZY010735]
- Collaborative Innovation Program of Shandong Higher Education Institutions [SDE [2017] 11]
- Funds of Shandong Double Tops Program [SYL2017YSTD11]
The study evaluated the heavy metal pollution status of livestock breeding water bodies in the Dawen River basin of Shandong Province, China, and identified a potential risk of iron pollution. The resistance of Escherichia coli to various antibiotics was observed, with a high detection rate of the tetA resistance gene, suggesting overuse of cephalosporins and tetracyclines in livestock industries.
Heavy metals and antimicrobial resistant bacteria in livestock and poultry environments can cause declines in production and significant economic losses, leading to potential environmental and public health issues. In this study, the heavy metal pollution status of livestock breeding water bodies in the Dawen river basin of Shandong Province in China was evaluated, and a total of 10 heavy metals were measured. In addition, antimicrobial susceptibility tests were conducted for Escherichia coli strains isolated from the water samples. The results showed that among all the metals, copper, zinc, and iron were detected at each sampling point, followed by nickel (detection rate of 95.74%), arsenic (detection rate of 89.36%), selenium (detection rate of 68.09%), lead (detection rate of 27.66%), and mercury (detection rate of 12.77%). Cadmium and hexavalent chromium were not detected. The contents of nine heavy metals were below the existing water standard values in China, whereas the iron pollution index in the water body in the study area was large and may pose a potential risk. A total of 17 E. coli isolates showed different resistance to beta-lactams, aminoglycosides, tetracyclines, quinolone antibiotics and chloramphenicol, but were mainly resistant to beta-lactams and tetracyclines. The detection rate of the tetA resistance gene was relatively high, indicating the overuse of cephalosporins and tetracyclines. The results of the present study might provide evidence of metal pollution and theoretical basis on the treatment of colibacillosis in the livestock industries. (C) 2020 Elsevier Ltd. All rights reserved.
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