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Citation: YU Hao-Ran, CAO Fang, ZHANG Wen-Qi, ZHAO Zhu-Yu, ZHANG Yan-Lin. Determination of ¹⁷O Anomaly in Atmospheric Aerosol Nitrate[J]. Chinese Journal of Analytical Chemistry, ;2021, 49(2): 253-262. doi: 10.19756/j.issn.0253-3820.201479 shu

Determination of ¹⁷O Anomaly in Atmospheric Aerosol Nitrate

Center for Atmospheric Environment, Joint Laboratory of International Cooperation on Climate and Environmental Change, Collaborative Innovation Center for Meteorological Disaster Forecasting and Assessment/Key Laboratory of Meteorological Disasters, Ministry of Education, Nanjing University of Information Science and Technology, Nanjing 210044, China

Corresponding author: ZHANG Yan-Lin, dryanlinzhang@outlook.com
Received Date: 8 August 2020
Revised Date: 11 November 2020

Fund Project: Supported by the National Natural Science Foundation of China (No.41977305), the National Key Research and Development Project of China (No. 2017YFC0212704), the Natural Science Foundation of Jiangsu Province, China (No.BK20180040) and the Project of Jiangsu Enovation & Entrepreneurship Team.

A novel method for rapid determination of ¹⁷O anomaly in atmospheric aerosol samples was developed. With this method, the measurement was completed in 15 min with higher analytical precision and lower detection limit. This method required a minimum of 0.4 μg N for achieving an analytical precision of 0.6‰, and 0.8 μg N was selected in this work. The nitrate in atmospheric aerosol samples was converted to nitrous oxide by optimized bacterial denitrification process within 4 h. After that a thermal decomposition of nitrous oxide in sample gas was carried out in a gold tube at 800℃ after separation and purification, followed by gas chromatographic separation and isotope analysis of oxygen. The experiment result showed that the analytical precision of Δ¹⁷O by this method could reach 0.19‰ at a sample content of 0.8 μg N, and δ¹⁵N could reach 0.15‰ at same time. This method was not only suitable for determination¹⁷O anomaly in atmospheric aerosol samples, but also for the other atmospheric environmental samples such as rain and snow samples with low concentrations.
- Atmospheric aerosol,
- Nitrate,
- Bacterial denitrification,
- ¹⁷O Anomaly
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通讯作者: 陈斌, bchen63@163.com

Determination of ¹⁷O Anomaly in Atmospheric Aerosol Nitrate