氮氧同位素示踪南昌秋冬季降水中NO<sub>3</sub><sup>-</sup>来源及其贡献

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Abstract Rainwater was collected from September 1, 2016 to February 28, 2017 in Nanchang, as well as stable isotope of nitrate (δ¹⁵N) and chemical compositions of rainwater were analyzed. The results showed that the concentration of NO₃^- ranged from 7.3 to 99.5μmol/L, and the mean is 36.1μmol/L; the δ¹⁵N of NO₃^- ranged from -6.0‰ to +8.3‰, and the mean is -0.8‰. Combined with chemical composition and isotope analysis, it is shown that NO₃^- was mainly affected by the region and mainly comes from biomass burning, traffic, coal combustion while biological soil is the secondary source in the sampling period. Bayesian mixing model (MixSIA) which took account of the isotope fractionation wes used to make precise estimations of the contribution of different sources. The results showed that the contribution of biomass burning emissions, traffic and coal combustion was more than 86%. However, in this case, the contribution of biomass burning emissions and traffic was more than 63%, and the coal combustion was only 23.1%, which indicated that a necessity to control NO_x from traffic and biomass burning strictly to reduce air pollution.

Key words： Nanchang nitrate precipitation nitrogen isotope Bayesian mixing model (MixSIA)

Received: 03 February 2021

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X571

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	AI Wen-qiang
	XIAO Hong-wei
	SUN Qi-bin
	ZHANG Yong-yun
	ZHANG Zei-yu
	LI Jing-wen

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AI Wen-qiang,XIAO Hong-wei,SUN Qi-bin等. Tracking the source and contribution of NO₃^- in precipitation in Nanchang in autumn and winter by dual isotope[J]. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(9): 4043-4050.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2021/V41/I9/4043

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