考虑形状和聚合物的模拟,以解开河口微塑料的命运
Yichuan Zeng1, Hua Wang1, Dongfang Liang2
1Key Laboratory of Integrated Regulation and Resource Development on Shallow Lake of Ministry of Education, College of Environment, Hohai University, Nanjing 210098, China; College of Environment, Hohai University, Nanjing 210098, China.
Journal of hazardous materials
|October 4, 2023
概括
这项研究估计了长江河口的微塑料 (MP) 负载,揭示了潮间区域的再悬浮对运输有重大影响. 一个新的MP风险指数有助于了解和管理塑料污染在到达海洋之前.
科学领域:
- 环境科学 环境科学
- 海洋生物学 海洋生物学
- 化学海洋学 化学海洋学
背景情况:
- 河口是微塑料 (MP) 运输到海洋的关键接口.
- 准确评估MP负载和河口的命运对于生态风险评估至关重要.
- 长江河口 (YRE) 是全球塑料污染的主要来源.
研究的目的:
- 为了准确估计长江河口表面层中的微塑料颗粒质量负荷.
- 研究粒子特征 (形状,大小,聚合物类型) 对MP传输的影响.
- 为敏感地区制定新的微塑料风险指数.
主要方法:
- 使用形状因子和大小概率密度函数开发了一个MP粒子质量梯度.
- 在高输入时期量化MP负载,将优化估计与实证平均值进行比较.
- 集成的潮间区域再悬浮和按形状和聚合物类型分类的MP运输.
- 为敏感地区提取模拟结果,以评估新的MP风险指数.
主要成果:
- 在高输入时期,YRE表面层的优化MP负载估计为9766公斤/月.
- 经验平均粒子质量高估了MP负载的821公斤/月.
- 包括潮间再悬浮在内,可将模拟误差降低到平均19.6%.
- 开发了一个新的MP风险指数,考虑了形状,丰度和聚合物类型.
结论:
- 在河口中准确估计MP负载需要考虑颗粒特征和再悬浮.
- 潮间区域是MP重悬浮的重要来源,影响向海运输.
- 开发的MP风险指数为评估和管理河口塑料污染提供了有价值的工具.
- 了解河流MP在河口的命运,为海洋前的移除提供了机会.
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