深圳市大气中PM<sub>2.5</sub>载带金属污染特征及健康风险

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Abstract In this study, mass concentrations of 15PM_2.5-bound metals in Shenzhen's road ambient air were online observed with a resolution of 1h from March 2020 to February 2021. Results showed that: total average concentration of PM_2.5-bound metals in the road ambient air in Shenzhen was 1062.3±434.6ng/m³, and Fe, Al, K, Ca and Zn were the main contributor, which contribute 95.5% of total metals. Higher concentration of Fe was strongly affected by road dust and vehicle emissions. Significant seasonal differences happened in of metals. The concentration was the highest in winter (1709.3ng/m³) and lowest in summer (644.1ng/m³). Mn, Fe, Cr, Zn and Ca obtained obvious diurnal variation, which were consistent with traffic peaks for vehicles. Diurnal variation analysis revealed that: high concentrations of V and Ni from ship emissions at night deserve attention, while the concentrations of Mn, Zn and Ca were higher during the day than at night, which was related to the higher traffic flow of vehicles during the day. The daytime and nighttime concentrations of total metals on high pollution days were both 1.9times the average daytime and nighttime concentrations throughout the year. Non-carcinogenic risks of adults and children exposed to the road ambient air in Shenzhen were lower than the threshold of 1. However, total carcinogenic risks (6.5×10^-6) exceeded the carcinogenic risk threshold of 10^-6, and the sum of the carcinogenic risks of As and Cr (mainly from vehicle emissions) accounted for 88.9% of the total carcinogenic risk, indicating that the carcinogenic risk in PM_2.5-bound metals of traffic deserves attention and needs to be controlled continuously.

Key words： road ambient air PM_2.5-bound metals diurnal variation health risks

Received: 13 May 2022

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X513

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	GU Tian-fa
	YAN Run-hua
	YAO Pei-ting
	LIN Xiao-yu
	LUO Yao
	CAO Li-ming
	ZHANG Ming-di
	HUANG Xiao-feng

Cite this article:

GU Tian-fa,YAN Run-hua,YAO Pei-ting等. Characteristics and health risks of ambient PM_2.5-bound metals in Shenzhen[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(1): 88-95.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/I1/88

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