河水中的典型轮胎添加剂:泄漏,转化和环境风险评估
Shaopeng Xu1, Qi Wang1, Jia-Yong Lao1
1State Key Laboratory of Marine Pollution and Department of Chemistry, City University of Hong Kong, Tat Chee Avenue, Kowloon 999077, Hong Kong SAR, China.
Environmental science & technology
|October 9, 2024
概括
轮胎磨损颗粒将有害的轮胎添加剂释放到水生环境中. 这项研究确定了它们的转化产品并评估了生态风险,发现一些添加剂及其副产品对环境构成重大威胁.
科学领域:
- 环境化学环境化学
- 生态毒理学 生态毒理学
- 分析化学 分析化学
背景情况:
- 轮胎磨损颗粒 (TWPs) 用轮胎添加剂 (TAs) 污染水生生态系统.
- 人们对TA及其转化产品 (TP) 的环境命运和生态影响知之甚少.
- 了解TA转化对于评估水生生态系统健康至关重要.
研究的目的:
- 研究水生环境中从TWPs中出的TA的转化机制.
- 在河水和城市地表水中识别和量化TA和TP.
- 评估与TA和TP相关的生态风险.
主要方法:
- 实验室模拟实验模仿TWP在河水中的漏.
- 现场调查分析了香港16个地点的城市地表水样本.
- 高分辨率质谱仪用于疑似查和鉴定TA和TP.
- 半定量分析以确定TP的流行率和转化途径.
主要成果:
- 观察到12个TAs在24小时内从TWPs显著泄露 (7-95%).
- 从8个TA中暂时确定了48个TP,其中基解水和子通路占主导地位.
- 来自N-(1,3-二甲基丁) -N'--p-phenylenediamine (6PPD) 的TPs占主导地位.
- 现场研究在香港城市水域检测到17个TA和1个TP,另外16个TP被确定.
- 估计有6个PPD-和7个TA构成中等至高的生态风险.
- 经常检测到的TP,N-(1,3-dimethylbutyl) -N'-phenyl-p-quinonediimine,被确定为持久性,生物积累性和有毒性 (PBT).
结论:
- 酸盐很容易从TWP中浸出,并在水生环境中发生转化.
- 6PPD及其转化产品,特别是6PPD-,对生态造成了重大关注.
- 鉴定到的PBT物质需要进一步的调查和潜在的监管措施来减轻环境风险.
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