热光法测量扬尘碳组分的激光分割点偏移

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Abstract In order to study the characteristics and causes of laser split point shift(LSPS) of Organic Carbon(OC) and Elemental Carbon(EC) in fugitive dust by thermal-optical method(IMPROVE_A TOT), and to propose two data processing methods, we collected 607 fugitive dust samples(road dust, urban dust, soil dust) from number of cities, including Xining, Shenyang, Zibo,Shiyan, and areas of Xinjiang Wu-Chang-Shi. We used resuspension chamber to collect PM_2.5 filter samples from the fugitive dust.The results showed:road dust and urban dust samples mainly occurred early split of EC/OC, and the proportion was less than 10%.Carbonate carbon(CC) and metal/mineral elements were the main influencing factors. When the proportion of CC to total carbon(TC) was more than 9%, CC could be removed by adding acid. The soil dust samples mainly occurred late split of EC/OC, and the proportion was between 40% and 90%. The reason was that its EC was low(EC/TC<10.7%), resulting in the interference of laser by the remaining heat resistant Fe₂O₃ was greater than the absorption of laser by EC. We proposed two data processing methods to correct LSPS:(1) Setting OPC to zero(OPC₀); or(2) a replaced value(OPC_re). Based on the comparison with the reference values,the relative deviations of OC were 0.1%~10.3% and 2.1%~52.5%, and EC were 0.1%~2.9% and 0.1%~20.6%. They were much lower than the relative deviations caused by LSPS:0.6%~13.8% and 66.6%~149.6%. And the OPC_re was better than OPC₀.

Key words： thermal-optical carbon analysis fugitive dust laser split point shift carbonate carbon OPC to zero replaced OPC

Received: 01 August 2021

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	Articles by authors
	WANG Jing
	XU Bo
	GUO Li-yao
	LI Li-ming
	MA Yin-hong
	LIANG Han-dong
	YANG Wen
	BAI Zhi-peng

Cite this article:

WANG Jing,XU Bo,GUO Li-yao等. Laser split point shift in measuring carbon components of fugitive dust by thermal-optical method[J]. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(3): 1073-1081.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2022/V42/I3/1073

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