目前正在进行的实验室性能研究,对三种水生被动样本中疏水性和亲水性化合物的化学分析进行研究
Kees Booij1, Steven Crum2, Branislav Vrana3
1PaSOC, Kimswerd 8821 LV, The Netherlands.
Environmental science & technology
|April 5, 2024
概括
能力测试显示,环境评估的化学分析具有显著的变化. 在分析疏水性和亲水性化合物时存在很高的不确定性,因此在被动采样数据的解释中需要仔细考虑.
科学领域:
- 环境化学环境化学
- 分析化学 分析化学
- 环境监测 环境监测
背景情况:
- 准确的化学分析对于使用被动采样技术进行可靠的环境评估至关重要.
- 被动采样器,包括,低密度聚乙烯 (LDPE) 和极性有机化学集成采样器,广泛用于污染物的监测.
- 了解分析测量的变化和不确定性对于可靠的环境风险评估至关重要.
研究的目的:
- 评估化学分析的性能和可变性,用于被动样本的熟练测试程序.
- 评估聚合物样本中的疏水性有机化合物和剂样本中的疏水性化合物的数据质量.
- 确定分析方法和实验室性能对环境度估计总体不确定性的影响.
主要方法:
- 一个涉及多个实验室的熟练测试计划,分析和LDPE样本中的疏水化合物,以及极性有机化学集成样本中的疏水化合物.
- 对化合物度的实验室间变化系数 (CVs) 的统计分析.
- 对内部标准,提取溶剂和提取时间对水友性化合物的数据质量影响的评估.
- 根据最佳实验室的性能计算水度估计的标准偏差.
主要成果:
- 疏水化合物的中位数CV为33% () 和38% (LDPE),在多个程序轮中一致.
- 对于水友性化合物,观察到显著更高的变异性 (50% CV 未转化,经日志转化后是1.6倍).
- 将分析限制在表现最好的实验室中并没有降低可变性;水友化合物的数据质量与分析选择的相关性很弱.
结论:
- 能力测试提供了对分析不确定性的现实估计,通常超过内部质量控制的不确定性.
- 在环境评估中必须考虑与疏水性和亲水性化合物分析相关的高分析不确定性.
- 这些发现强调了需要改进的分析方法和严格的质量保证在被动抽样研究.
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