一种用于连续空气金属测量的新型校准方法:对气溶源分配的影响
Yucheng Zhu1, Chengfeng Liu1, Juntao Huo2
1Center for Atmospheric Chemistry Study, Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention (LAP(3)), National Observations and Research Station for Wetland Ecosystems of the Yangtze Estuary, Department of Environmental Science and Engineering, Fudan University, Shanghai 200433, China.
The Science of the total environment
|November 4, 2023
概括
连续金属监测器的常规校准是不可靠的,特别是在低度下. 使用初级标准气溶质量度校准系统 (PAMAS) 的新多点校准显著提高了数据准确性和源分配结果.
科学领域:
- 环境科学 环境科学
- 分析化学 分析化学
- 大气科学 大气科学
背景情况:
- 连续金属监控器为环境监控和源分配提供高时间分辨率.
- 传统的单点校准方法往往会导致显著的数据偏差,特别是在低度范围内.
- 使用实时金属监测数据对源识别的校准的可靠性和影响尚未得到充分研究.
研究的目的:
- 开发和应用一个可靠的多点校准方法,用于 Xact625i 环境金属监测器使用初级标准气溶质量度校准系统 (PAMAS).
- 在校准之前和之后,在不同的度范围内评估 Xact625i 监控器的准确性.
- 评估校准金属监测数据对源分配结果的影响.
主要方法:
- 开发了一种使用PAMAS的多点校准方法,以产生20种金属元素的已知度.
- 在两个度范围 (150-1200 ng m-3和2.5-30 ng m-3) 中验证了Xact625i环境金属监测器.
- 应用了正矩阵因子化 (PMF) 模型来评估数据校准前后的源分配.
主要成果:
- 传统的单点校准导致偏差在低度范围内超过100%.
- 帕马斯校准提高了准确性,在高度和低度范围内,大多数元素的斜率接近统一.
- 校准的金属数据显著改变了源因子识别和PMF分析中的贡献.
结论:
- 可靠的校准方法对于准确的在线气溶金属监测至关重要.
- 未校准的监测数据可能会导致大量的偏差和不准确的来源分配.
- 基于PAMAS的多点校准为实时金属监测仪器提供了更可靠的方法.
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