在水中分析小 (<20微米) 微塑料的分样采集策略
Xingyu Feng1, Vishal Manek1, Robert C Andrews1
1Department of Civil and Mineral Engineering, University of Toronto, 35 St. George St., Toronto ON M5S 1A4 Canada.
Water research
|May 24, 2025
概括
准确量化饮用水中的微塑料 (MP) 需要仔细的分样. 这项研究确定了分析的最佳6-8%的过面积,最大限度地减少了微小塑料颗粒的推断误差.
科学领域:
- 环境科学 环境科学
- 分析化学 分析化学
- 分析水质 分析水质
背景情况:
- 饮用水中的微塑料 (MP) 量化依赖于光谱方法.
- 由于时间限制,当前的方法经常使用子采样,从小波器区域推断数据.
- 这些推断策略的准确性,特别是对于小国会议员,仍然没有得到评估.
研究的目的:
- 评估饮用水中MP的亚样本面积和外推精度之间的关系.
- 确定最佳的分样采集策略,重点关注颗粒<20微米.
- 将基于网格的新型随机子抽样方法与现有技术进行比较.
主要方法:
- 开发基于网格的随机子抽样方法作为基线.
- 对低密度聚乙烯 (LDPE),聚烯 (PP) 和聚烯 (PS) 碎片 (2-100微米) 的分析.
- 评估不同亚样本面积和颗粒大小的抽取误差.
主要成果:
- 随着子样本面积的增加,外推误差会减少,遵循功率定律的趋势.
- 在总过面积的6-8%左右的最小子样本值,输出了8-17%的推算误差.
- 一个日志正常模型有效地描述了颗粒大小分布的颗粒>2-5μm.
结论:
- 为优化饮用水分析微塑料子样本采集策略提供了关键的见解.
- 建议最小的分样面积,以确保可靠的微塑料量化.
- 强调在分析方法开发中考虑颗粒大小分布的重要性.
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