挥发性甲氧和持久性有机污染物的采样效率提高显示加拿大空气中的度不断增加
Yu-Mei Hsu1, Fiona Wong1, Hayley Hung1
1Air Quality Processes Research Section, Environment and Climate Change Canada, 4905 Dufferin St, Toronto, Ontario, M3H 5T4, Canada. hayley.hung@ec.gc.ca.
Environmental science. Processes & impacts
|June 13, 2025
概括
加拿大长期监测显示,北极空气中挥发性有机化合物和持久性有机污染物 (POPs) 的含量不断增加. 当地空气交换对大湖盆地POPs产生重大影响,而远程运输则在Alert.中占主导地位.
科学领域:
- 环境化学环境化学
- 大气科学 大气科学
- 北极研究研究北极研究
背景情况:
- 自20世纪80年代以来,持续有机污染物 (POP) 的长期空气监测计划在加拿大的大湖盆地 (GLB) 和努纳武特州的Alert运行.
- 这些计划已扩展到包括新兴北极关注的化学品 (CEACs),如挥发性甲基 (HMBs),由于它们日益相关.
- 高波动的CEACs可以导致采样突破,需要改进的收集方法.
研究的目的:
- 评估POP和CEAC的区域和远程运输 (LRT) 的动态.
- 通过改进的采样技术来表征特定的POP和HMB的空气度.
- 区分LRT与局部地表空气交换对警报和GLB地点污染物水平的影响.
主要方法:
- 使用聚氨泡-XAD2树脂三明治的高容量空气采样器,以提高采集效率.
- 从2009年到2020年,对六丁 (HCBD),六二 (HCB),五二 (PeCB),2,4-二二 (DBA),2,4,6-三二 (TBA) 和多索菲林A甲基乙烯 (DAME) 的空气度进行分析.
- 在 Alert 和 GLB 监测站点之间比较污染物水平和影响因素 (LRT 与本地交换).
主要成果:
- 在2009年至2020年期间,HCB,HCB,PeCB,DBA,TBA和DAME的空气度在警报时增加.
- 警报时HCBD,HCB和PeCB水平的上升可能与非故意的工业副产品有关.
- 大气中的HMB和POP度主要是由LRT驱动的,而局部地表空气交换是GLB地点的主要驱动因素,除了一些例外.
结论:
- 该研究强调了加拿大空气中特定的POP和CEAC的增加趋势,特别是在北极地区.
- 不同的运输机制控制了北极地区的污染物水平 (警报) 与大湖盆地 (GLB).
- 改进的采样方法对于在长期空气质量计划中准确监测挥发性化合物至关重要.
更多相关视频
09:46Production and Measurement of Organic Particulate Matter in the Harvard Environmental Chamber
Published on: November 18, 2018
7.2K
09:33Visualizing Field Data Collection Procedures of Exposure and Biomarker Assessments for the Household Air Pollution Intervention Network Trial in India
Published on: December 23, 2022
2.2K
相关概念视频
Sampling Plans
169
Sampling is a crucial step in analytical chemistry, allowing researchers to collect representative data from a large population. Common sampling methods include random, judgmental, systematic, stratified, and cluster sampling.
Random sampling is a method where each member of the population has an equal chance of being selected for the sample. It involves selecting individuals randomly, often using random number generators or lottery-type methods. For example, when analyzing the properties of a...
Random sampling is a method where each member of the population has an equal chance of being selected for the sample. It involves selecting individuals randomly, often using random number generators or lottery-type methods. For example, when analyzing the properties of a...
169
Sampling Methods: Sample Types
192
Sampling materials are classified into three main types: solid, liquid, and gas.
Solid samples include a variety of substances, such as sediments from water bodies, soil, metals, and biological tissues. Two standard methods for extracting sediments from water bodies are grab sampling and piston coring. Grab sampling involves using a device to collect a discrete sediment sample from the bottom of a water body with minimal disturbance. Grab samples do not always represent the entire area due to...
Solid samples include a variety of substances, such as sediments from water bodies, soil, metals, and biological tissues. Two standard methods for extracting sediments from water bodies are grab sampling and piston coring. Grab sampling involves using a device to collect a discrete sediment sample from the bottom of a water body with minimal disturbance. Grab samples do not always represent the entire area due to...
192
