南京冬夏硫酸盐和硝酸盐对黑碳混合态的影响

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Abstract

The impact of nitrate and sulfate aerosols on the mixing state of black carbon (BC) particles was investigated by using on-line measurements of a single particles soot photometer (SP2) and a MARGA in urban Nanjing in winter and summer. Results showed that the mass concentration of BC was in the range of 1.01~14.5μg/m³ (0.20~3.81μg/m³), with an average value of (4.39±2.66)μg/m³[(1.67±0.76)μg/m³] inwinter (summer), respectively. The diurnal variations of BC particles presented two peaks relative to rush hours in morning and evening. The mixing state of BC-containing particles were evaluated as a ratio of D_p/D_c, the average ratio of which was 1.81±0.21 (1.24±0.08) and ranged from 1.39 to 2.34 (from 1.03 to 1.45) in winter (summer), respectively. D_p/D_cshowed an opposite diurnal trend as comparing with BC, where made more obvious variations for winter. D_p/D_ccorrelated well with sulfate and nitrate, and showed higher correlation with nitrate (sulfate) in winter (summer), respectively. Local emissions were the major source contributing to BC, the mixing state of which was more significant influence of nitrate and sulfate during clean periods in winter. The correlation between D_p/D_cwith sulfate and nitrate in winter was lower during heavy pollution periods, resulting from the effects of both local emissions and regional transports on ambient BC particles.

Key words： Nanjing black carbon single particles soot photometer (SP2) mixing state sulfate nitrate

Received: 13 September 2017

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	Articles by authors
	YANG Yi-fan
	TANG Li-li
	XU Xiao-feng
	JIANG Lei
	LIU Dan-tong
	ZHANG Yun-jiang
	HUA Yan
	DU Song-shan
	WANG Zhuang
	ZHOU Hong-cang

Cite this article:

YANG Yi-fan,TANG Li-li,XU Xiao-feng等. Impact of sulfate and nitrate on black carbon aerosols at Nanjing in winter and summer[J]. CHINA ENVIRONMENTAL SCIENCECE, 2018, 38(4): 1221-1230.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2018/V38/I4/1221

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