发光细菌法评价疫情暴发对长江流域地表水生态毒性的影响
Evaluation of Impact of COVID-19 Outbreaks on Ecotoxicity of Surface Water in the Yangtze River by Luminescent Bacteria Method
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摘要: 在疫情暴发期间，大量使用的消毒剂和抗疫药物对水生态环境带来未知的潜在风险。本研究以长江流域为研究对象，选取4个江段(攀枝花、三峡、九江和南京江段)，在3个季节(疫情暴发前、中、后期)采集表层水样，利用生物毒性测试对长江流域多个地区进行发光菌急性毒性研究。空间分布上，从长江流域上游到下游，水中有机污染物急性毒性呈现逐渐升高的趋势，其中南京江段水中有机物急性毒性相对较高。时间分布上，丰水期(疫情暴发期间)有机污染物急性毒性高于枯水期和平水期，可能源于疫情期间大量使用的消毒剂等带来的生态毒性效应。发光细菌急性毒性检测体系简单快速，能够全面客观地评价水质，可以弥补化学分析只能检测有限目标化合物的不足。Abstract: During COVID-19 outbreaks, the massive use of disinfectants and anti-epidemic drugs brought unknown potential risks to the aquatic environment. Taking the Yangtze River Basin as the object, four sections were selected, and surface water samples were collected in three seasons (before, during and after the COVID-19 outbreak), and the acute toxicity of luminescent bacteria was studied by using biotoxicity tests. Spatial distribution showed that from the upstream to the downstream of the Yangtze River Basin, the acute toxicity of organic pollutants had a gradually increasing trend, with the highest found at Nanjing section. For temporal distribution, the acute toxicity of organic pollutants in wet season was higher than that in dry and normal seasons, which may be due to the ecotoxicity effect caused by the large-scale use of disinfectants during the epidemic. The acute toxicity detection system of luminescent bacteria is simple and fast, and can comprehensively and objectively evaluate water quality, making up for the deficiency that chemical analysis can only detect limited target compounds.
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Key words:
- COVID-19 /
- surface water /
- Q67 /
- acute toxicity /
- Yangtze River
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