Hebei Key Lab of Power Plant Flue Gas Multi-Pollutants Control, Department of Environmental Science and Engineering, North China Electric Power University, Baoding, 071003, People's Republic of China.
MOE Key Laboratory of Resources and Environmental Systems Optimization, College of Environmental Science and Engineering, North China Electric Power University, Beijing, 102206, People's Republic of China.
Environ Sci Pollut Res Int. 2019 Oct;26(30):30826-30835. doi: 10.1007/s11356-019-06176-w. Epub 2019 Aug 24.
The sequential extraction method was used to determine the fraction of arsenic (As) in different-sized particulate matters (PMs) (i.e., PM, PM, and total suspended particles (TSP)). Samples were collected from Baoding, a typical medium-sized city with the serious haze pollution in China. The bioavailabilities of As in the samples were estimated based on the fraction results. A large percentage of fine particles were detected in TSP, with the average PM/PM and PM/TSP ratios all above 0.69. The total concentrations of As in PM, PM, and TSP samples were in the range of 4.5-296.4, 14.1-708.0, and 32.8-798.0 ng m, respectively. The mass percentages of As in PM, PM, and PM were calculated; the results indicated that As tended to concentrate in fine particles. PM-bound As mainly presented in the nonspecifically sorbed fraction (F1) during all of the sampling periods. The percentages of F1-As and bioavailability of As were higher in PM, followed by PM and TSP. By contrast, the residual fraction (F5-As) contents declined in the order of TSP > PM > PM. Significant differences in the speciation and bioavailability of As in different-sized PMs were found, and the influence of particle size on the speciation and bioavailability of As in PMs was verified. Fine particles adsorbed more As with higher bioavailability, and potentially led to more serious adverse effects on human health than the larger ones.
采用连续提取法测定了不同粒径颗粒物（PM、PM 和总悬浮颗粒物（TSP）中砷（As）的赋存形态。样品取自中国雾霾污染严重的典型中型城市保定。根据分馏结果估算了样品中 As 的生物可利用性。TSP 中检测到大量细颗粒物，平均 PM/PM 和 PM/TSP 比值均高于 0.69。PM、PM 和 TSP 样品中 As 的总浓度分别在 4.5-296.4、14.1-708.0 和 32.8-798.0ngm 之间。计算了 PM、PM 和 PM 中 As 的质量百分比，结果表明 As 倾向于在细颗粒中浓缩。在所有采样期间，PM 结合态 As 主要以非特异性吸附态（F1）存在。PM 中 F1-As 的百分比和 As 的生物可利用性较高，其次是 PM 和 TSP。相比之下，残留态（F5-As）含量按 TSP>PM>PM 的顺序下降。发现不同粒径 PM 中 As 的形态和生物可利用性存在显著差异，验证了粒径对 PM 中 As 形态和生物可利用性的影响。细颗粒物吸附了更多具有更高生物利用度的 As，可能比大颗粒物对人体健康造成更严重的不良影响。
