Department of Biosciences, University of Milan, Milan, Italy.
Sci Total Environ. 2013 May 1;452-453:253-61. doi: 10.1016/j.scitotenv.2013.02.069. Epub 2013 Mar 20.
This study investigates the contamination by 13 polybrominated diphenyl ether (PBDE) congeners in an altitudinal soil transect on Mt. Meru area, Northern Tanzania. A ∑13PBDEs mean concentration of 386±200 pg/g d.w. (4900±3500 pg ∑13PBDEs/g soil organic matter - SOM) was measured, pointing out that, in a prevalently agricultural area from the southern hemisphere, PBDE contamination can be even higher than in similar semi-remote environment of industrialized country of the northern one. The Mt. Meru PBDE pattern of contamination was characterized by the prevalence of intermediate brominated congeners (tetra- and penta-BDEs). Among the detected compounds, BDE-47 was the main congener, followed by BDE-99, BDE-190 and BDE-100. The distribution of PBDEs confirmed that organic carbon had a substantial impact on their accumulation in Tanzanian soils. The altitudinal profile of PBDEs (log TOC-normalized concentrations) fitted a second order polynomial model with altitude, with an initial concentration decrease, interpreted as a dilution effect from local/regional sources, and a following consistent increase with altitude according to the cold condensation theory. Evidences of distillation effect among PBDE congeners were also observed.
本研究调查了坦桑尼亚北部梅鲁山地区海拔土壤横断面上 13 种多溴二苯醚（PBDE）同系物的污染情况。∑13PBDEs 的平均浓度为 386±200 pg/g d.w.（4900±3500 pg ∑13PBDEs/g 土壤有机质 - SOM），这表明在南半球以农业为主的地区，PBDE 的污染程度可能比工业化国家类似的偏远地区更高。梅鲁山 PBDE 的污染模式以中溴代同系物（四溴和五溴代 BDEs）为主。在所检测到的化合物中，BDE-47 是主要的同系物，其次是 BDE-99、BDE-190 和 BDE-100。PBDEs 的分布证实了有机碳对坦桑尼亚土壤中 PBDEs 积累的重要影响。PBDEs 的海拔分布（以 TOC 为标准化的浓度对数）与海拔拟合了一个二次多项式模型，随着海拔的升高，浓度先下降，这可以解释为来自当地/区域源的稀释效应，随后根据冷冷凝理论，浓度持续升高。在 PBDE 同系物之间也观察到了蒸馏效应的证据。
