2020同步年報

066 ACTIVITY REPORT 2020 Fig. 2 : Quarterly variations in major chemical components analyzed in PM 2.5 in PRD and YRD regions of China. [Reproduced from Ref. 1] particle sample, As K-edge (11,871.1 eV) X-ray- absorption near-edge structure (XANES) spectra of four selected PM 2.5 filter samples ( i.e ., three from PRD and one from YRD regions) with a large concentration of As were acquired in fluorescence mode at TLS 01C1 , coupled with NaAsO 2 and Na 2 HAsO 4 as reference standards, shown in Fig. 1(b) . Compared with the variations in PM 2.5 concentrations, the differences between inter-regional profiles of chemical composi- tions were more pronounced than those of intra-regional ones because of the diversities of industrial activity, shown in Fig. 2. A greater proportion of water-soluble ions relevant to secondary inorganic aerosols (NO 3 - , SO 4 2- and NH 4 + ) was observed and a smaller proportion of carbonaceous materials (organic matter OM and EC) was indicated to contribute from combustion activities to the total identified components in YRD than in PRD. This investigation profiled regional PM 2.5 pollution, variations in PM 2.5 associated metals, and other chem- ical species based on the regional development in YRD (east China) and PRD (south China) regions, and also highlighted the importance of asso- ciating bioaccessibility and speciation of metal ions with PM 2.5 to assess the health risks of residents in those re- gions. Xiangdong Li (Chinese Acade- my of Sciences, China) and coworkers considered promoting the low-risk living environment and emission reduction in a supplement to the current mass-concentration-based framework. (Reported by Yao-Chang Lee) This report features the work of Xiangdong Li and his collaborators published in Environ. Pollut. 262 , 114655 (2020). TLS 01C1 SWLS – EXAFS • XANES • Environmental Science Reference 1. J. Xie, L. Jin, J. Cui, X. Luo, J. Li, G. Zhang, X. Li, Environ. Pollut. 262 , 114655 (2020).