PPD类抗氧化剂和转化产品在小路径冲流影响的流域中的时间动态
Haoqi Nina Zhao1,2,3, Katherine T Peter1,2, Melissa Gonzalez1,2
1Center for Urban Waters, Tacoma, Washington 98421, United States.
Environmental science & technology
|August 21, 2025
概括
雨水排放带有有害的6PPD- (6PPDQ) 和相关污染物进入水道. 这些污染物对全年水生构成风险,在暴风雨期间超过安全水平.
科学领域:
- 环境化学
- 生态毒理学
- 监测水质
背景情况:
- 在水生环境中6PPD- (6PPDQ) 和PPD衍生的污染物的发生和运输尚不清楚.
- 这些污染物源于轮胎磨损颗粒,并可能影响水生生态系统.
- 道路影响的流域是这些新出现的污染物的重要来源.
研究的目的:
- 在风暴事件中描述6PPDQ和相关PPD污染物的时间动态.
- 在受道路影响的流域中量化污染物度和负载.
- 评估6PPDQ对水生生物带来的生态风险.
主要方法:
- 在华盛顿的米勒溪进行了17次暴风雨的定时水样采集.
- 使用分析化学技术量化了七种PPD抗氧化剂,五种子转化产品和五种其他6PPD转化产品.
- 分析了污染物度,峰值水平和风暴负载,并将它们与已确定的水生生物毒性值进行比较.
主要成果:
- 在风暴期间PPDQ度经常超过水生生物选值,峰值高达160 ng/L.
- 在暴风雨期间,PPDQ度超过了0-9小时的LC50值和8-19小时的EPA查值.
- 观察到6PPDQ (0.078-2.7g/暴风雨) 和其他PPD (10-77g/暴风雨),其中主要是"中等冲洗"和"运输限制"的动态.
结论:
- 在暴风雨期间,PPDQ和相关的PPD污染物始终被运送到接收水域.
- 峰值6PPDQ度对包括鱼在内的水生生物构成重大和持续的风险.
- 需要有效的管理策略来减轻这些轮胎污染物的环境影响.
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