Measurement based on DTT method of the PM2.5 oxidative potential in Guangzhou urban area
ZHANG Man-man1, LI Hui-rong1, YANG Wen-da1, SUN Jia-yin1, WU Cheng1, CHENG Peng1, TANG Ming-jin2
1. Guangdong Provincial Engineering Research Center for On-line Source Apportionment System of Air Pollution, Institute of Mass Spectrometer and Atmospheric Environment, Jinan University, Guangzhou 510632, China;
2. State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China
Oxidative potential can be used to characterize the impact of atmospheric particulate matter on human health. The DTT assay is a method recently developed to determine the oxidation potential of particulate matter. The extraction and reaction process of the DTT method were improved, and the method was employed to measure the oxidation potential of PM2.5 (DTTm & DTTv) at an urban site in Guangzhou. The DTTm values of PM2.5 in Guangzhou in January and April 2018 were found to be (13.47±3.86), (14.66±4.49) pmol/(min·μg), and the DTTv values were measured to be (4.67±1.06), (4.45±1.02) nmol/(min·m3), respectively. DTTv showed strongly correlations with mass concentration of PM2.5, OC, EC and BC, but no correlations were found between DTTm and carbonaceous particles, implied that carbonaceous particles is not the major contributor to oxidative potential of PM2.5 in Guangzhou.
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