School of Resource and Environmental Sciences, International Cooperation Base for Sustainable Utilization of Resources and Energy in Hubei Province, Wuhan University, Wuhan, 430072, China.
State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, 550081, China.
Environ Sci Pollut Res Int. 2019 Nov;26(31):31934-31944. doi: 10.1007/s11356-019-06312-6. Epub 2019 Sep 5.
Jinsha (JSH) is one of the regional background sites in Central China. In this study, eight polybrominated diphenyl ethers (PBDEs) were measured in atmospheric deposition samples (dry particle, wet particle, and wet dissolved), air (gaseous and particle) samples, and soil samples that were collected from March 2012 to March 2013. Of all eight PBDEs, BDE-209 was the most abundant congener in both deposition samples and air/soil samples. Average dry particle, wet particle, and wet dissolved deposition fluxes of ΣPBDEs were 270 ± 310 pg m day, 130 ± 210 pg m day, and 250 ± 330 pg m day, respectively, while those of BDE-209 were 210 ± 290 pg m day, 80 ± 120 pg m day, and 160 ± 290 pg m day, respectively. Dry deposition velocities of individual PBDE ranged from 0.11 ± 0.15 cm s (BDE-183) to 0.24 ± 0.38 cm s (BDE-209), and total washout ratios ranged from 5.0 × 10 (BDE-28) to 4.2 × 10 (BDE-209). The calculated net air-soil gas exchange flux of ΣPBDEs was - 16 ± 13 pg m day, suggesting the deposition status of PBDEs. The gas exchange flux at the air-soil interface was significantly lower than the deposition flux, which only accounted for 2.5% of the total deposition flux, implying that atmospheric deposition was an important input pathway for PBDEs to soils. Overall, the pollution level of the soil was relatively low, and the soil serves as a sink for PBDEs from adjacent regions.
金沙（JSH）是中国中部的一个区域背景站点。在这项研究中，于 2012 年 3 月至 2013 年 3 月期间采集了大气沉降样品（干颗粒、湿颗粒和湿溶解）、空气（气体和颗粒）样品和土壤样品，测定了其中的八种多溴二苯醚（PBDEs）。在所测的所有八种 PBDEs 中，BDE-209 是沉降样品和空气/土壤样品中最丰富的同系物。ΣPBDEs 的干颗粒、湿颗粒和湿溶解总沉降通量分别为 270±310pg·m-2·d-1、130±210pg·m-2·d-1和 250±330pg·m-2·d-1，而 BDE-209 的沉降通量分别为 210±290pg·m-2·d-1、80±120pg·m-2·d-1和 160±290pg·m-2·d-1。各 PBDE 的干沉降速度范围为 0.11±0.15cm·s-1（BDE-183）至 0.24±0.38cm·s-1（BDE-209），总洗脱比范围为 5.0×10-4（BDE-28）至 4.2×10-4（BDE-209）。ΣPBDEs 的净气-土气体交换通量为-16±13pg·m-2·d-1，表明 PBDEs 的沉积状态。气-土界面的气体交换通量明显低于沉积通量，仅占总沉积通量的 2.5%，这意味着大气沉降是 PBDEs 进入土壤的一个重要途径。总体而言，土壤的污染水平相对较低，土壤是来自邻近地区的 PBDEs 的汇。
