用低密度聚乙烯对多环芳的被动采样:水性悬浮中的平衡限制
Jialin Liu1,2, Binlong Liu1, Shuya Xie1
1Department of Geosciences, University of Tübingen, Schnarrenbergstraße 94-96, 72076, Tübingen, Germany.
Environmental monitoring and assessment
|October 13, 2024
概括
聚乙烯 (PE) 被动采样器迅速吸收多环芳 (PAHs) 等有机污染物. 了解边界条件是准确环境监测的关键,因为PE采样动力学因设置而异.
科学领域:
- 环境化学环境化学
- 分析化学 分析化学
- 聚合物科学 聚合物科学
背景情况:
- 聚乙烯 (PE) 和聚合物已成为环境有机污染物的被动采样器.
- 精确量化有机污染物需要了解被动采样机动力学和分区行为.
研究的目的:
- 用PE被动样本研究多环芳 (PAH) 的吸收,可逆性和平衡分区.
- 在不同条件下提供高分辨率的PE采样器性能实验数据.
主要方法:
- 进行了批量动测试,使用两个PE板 (30微米和80微米厚).
- 使用机械第一阶模型考虑水性边界层,模拟了南吸收动力学.
- 在不同的边界条件下确定了吸收和脱落的平衡时间.
主要成果:
- 在实验室批次系统中,吸收和脱吸平衡是快速的 (1-2小时),取决于PE质量与水体积比.
- 在土壤或沉积物等环境矩阵中,由于边界条件的改变,平衡时间可能会显著延长.
- 动力限制,特别是高分子量PAHs的动力限制,可能导致分割系数低于预期值.
结论:
- 当考虑动力限制时,使用PE的被动采样对有机污染物是可靠的.
- 使用基于分子性质的经验关系,可以准确估计分区系数.
- 该研究为优化在环境监测中使用PE被动采样器提供了关键数据.
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