在河口系统中,对-和多基基物质的度在潮周期内可以大大变化
Navneet Singh1, Jorge Paz-Ferreiro2, Matthew P J Askeland3
1Australian Centre for Research on Separation Science (ACROSS), School of Science, RMIT University, Bundoora West Campus, PO Box 71, Bundoora, Victoria 3083, Australia.
The Science of the total environment
|March 26, 2025
概括
澳大利亚河口中度的和多基物质 (PFAS) 在24小时内大幅波动. 每小时的监测显示了四到七倍的差异,突出了低估环境污染的风险.
科学领域:
- 环境化学环境化学
- 生态毒理学 生态毒理学
- 水质监测 水质监测
背景情况:
- 和多醇基物质 (PFAS) 是引起全球关注的持续性环境污染物,原因是它们的广泛存在,耐降解性和潜在毒性.
- 目前对PFAS的环境评估通常依赖于单个时间点的测量,可能会忽视污染物度的时间变化.
- 了解PFAS在河口系统中的动态行为对于准确的风险评估和有效的环境管理至关重要.
研究的目的:
- 在维多利亚州的三个河口,研究44种不同的PFAS化合物的度在24小时内每小时的变化.
- 为了确定潮周期对这些河口环境中的PFAS度的影响.
- 评估单个时间点抽样的可靠性,以鉴定河口的PFAS含量.
主要方法:
- 在澳大利亚维多利亚州的三个不同的地点,每小时抽取24小时 (两个潮周期) 的河口水样.
- 使用先进的分析技术量化44种特定的per-和poly-fluoroalkyl物质.
- 分析度数据与潮流入的关系,以确定变化的模式和驱动因素.
主要成果:
- 总PFAS (ΣPFAS) 度的显著时间变化被观察到,在24小时的采样期间,差异从4倍到7倍不等.
- perfluorohexanesulfonic acid (PFHxS) 被确定为最常见的化合物,达到72.3 ng/L的最大度.
- 在海水的潮涌入期间观察到的稀释表明PFAS度下降的主要机制.
结论:
- 每小时的监测显示 PFAS 度在河口中的时间变化很大,这挑战了单个采集样本的代表性.
- 由于PFAS水平的动态性,受潮过程的影响,需要更频繁的监测,以准确评估环境暴露和潜在风险.
- 目前的监测策略可能大大低估了河口生态系统中PFAS的真实范围和峰值度,这可能导致对生态风险的低估.
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