使用POD采样器进行环境空气中挥发性和非常挥发性有机物的定量扩散 (被动) 监测:采样率和分析性能
P Pérez Ballesta1, A Baù1, R A Field2
1European Commission, Joint Research Centre. Directorate C-Energy, Mobility and Climate. Clean Air and Climate Unit, I-21027, Ispra, VA, Italy.
Environment international
|August 19, 2023
概括
被动臭氧扩散采样器 (POD) 有效采样了63种挥发性化合物,不确定性低于30%. 对于不同类别的化合物,Carbopack X和Carbograph 5TD显示出不同的强度,提高了空气质量监测.
科学领域:
- 环境化学环境化学
- 分析化学 分析化学
- 空气质量监测 空气质量监测
背景情况:
- 被动采样设备为空气质量监测提供了低成本的替代活动采样.
- 准确量化挥发性有机化合物 (VOC) 对于评估空气污染及其对健康的影响至关重要.
研究的目的:
- 评估使用Carbopack X和Carbograph 5TD吸附剂的被动臭氧扩散采样器 (POD) 的性能,用于广泛的臭氧前体和有毒空气化合物.
- 开发和验证一个模型来估计采样率,并尽量减少各种暴露时间和度的不确定性.
主要方法:
- 用 Carbopack X 和 Carbograph 5TD 装载的 POD 采样器暴露在 110 种 VOC 的认证校准混合物中.
- 确定63种化合物的恒定采样率,其扩展不确定性低于30%,采样时间为224小时.
- 开发一个模型,根据分析剂量和暴露时间估计采样率,根据现场测量进行验证.
主要成果:
- 确定了39种臭氧前体和33种空气毒性物质的恒定采样率,总的不确定性<30%.
- 碳素5TD在氧化和化化合物方面表现出色;Carbopack X在碳化合物方面表现出更高的效率.
- 模拟的采样率降低了其他化合物的不确定性低于30%,扩大了适用的度范围,并提供了务实的应用指导.
结论:
- 使用 Carbopack X 和 Carbograph 5TD 的 POD 采样器可靠地采样各种可量化的不确定性的 VOC.
- 开发的建模方法提高了各种环境监测场景的被动采样的准确性和适用性.
- 现场比较证实POD采样器与传统方法之间没有显著差异,支持它们在现实应用中的使用.
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