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J Hazard Mater

Title:		A novel low sampling rate and cost-efficient active sampler for medium/long-term monitoring of gaseous pollutants
Author(s):		Wang Z; Yu T; Ye J; Tian L; Lin B; Leng W; Liu C;
Address:		"School of Energy and Environment, Southeast University, Nanjing 210096, China. Wuhan Second Ship Design and Research Institute, Wuhan 430205, China. School of Energy and Power, Jiangsu University of Science and Technology, Zhenjiang, Jiangsu 212100, China. Tianjin Institute of Environmental and Operational Medicine, Tianjin 300050, China. School of Energy and Environment, Southeast University, Nanjing 210096, China. Electronic address: liuc@seu.edu.cn"
Journal Title:		J Hazard Mater
Year:		2023
Volume:		20230919
Issue:
Page Number:		132583 -
DOI:		10.1016/j.jhazmat.2023.132583
ISSN/ISBN:		1873-3336 (Electronic) 0304-3894 (Linking)
Abstract:		"Active sampling is a dependable approach for gaseous pollutants monitoring, offering high accuracy and precision that is unaffected by environmental factors such as wind and temperature in comparison to passive sampling. To measure long-term average concentrations while minimizing the use of materials, a reduced sampling rate is necessary. Thus, this study aims to develop a novel low sampling rate (down to 1 mL/min) and cost-efficient active sampler (LASP) for medium/long-term monitoring of gaseous pollutants. The LASP mainly consisted of a syringe pump, a Y-shaped fitting with two one-way valves, and a control unit for intermittent operation. Results showed that LASP can obtain a sampling rate of less than 1 mL/min and sampling rate exhibited a high level of stability. Daily average concentrations measurements for nitrogen dioxide and formaldehyde by LASP had normalized mean biases of 2.8% and 5.2%, respectively. These numbers were - 5.8% and 6.1% for weekly-average samplings. This study demonstrated applications of LASP in real outdoor (daily-average) and indoor (weekly-average) air quality measurements. It worked well with low noise levels, and without interfering with occupants' daily activities. LASP can assist in improving our ability to monitor air quality and pollutants emissions, thereby supporting health research and policy development. ENVIRONMENTAL IMPLICATION: Gaseous air pollution is an important hazardous factor threatening human health. Medium/long-term air quality monitoring is essential for outdoor and indoor air quality assessment and control. However, air sampler for medium/long-term sampling is lacking. This study developed a novel low sampling rate and cost-efficient active sampler and applied it to medium/long-term air sampling. The sampler can work at a sampling rate of less than 1 mL/min. This technology provides a feasible strategy for medium/long-term monitoring of gaseous air pollutants in both environments and emission hotspots"
Keywords:		Hazardous air pollutants Indoor air quality Monitoring Personal exposure Volatile organic compounds;
Notes:		"PublisherWang, Zhiyuan Yu, Tao Ye, Jin Tian, Lei Lin, Bencheng Leng, Wenjun Liu, Cong eng Netherlands 2023/09/24 J Hazard Mater. 2023 Sep 19; 461:132583. doi: 10.1016/j.jhazmat.2023.132583"