Department of Agricultural Chemistry, National Taiwan University, No. 1, Sec. 4, Roosevelt Road, Taipei, 106, Taiwan, ROC.
Department of Agricultural Chemistry, National Taiwan University, No. 1, Sec. 4, Roosevelt Road, Taipei, 106, Taiwan, ROC.
Chemosphere. 2019 Dec;236:124117. doi: 10.1016/j.chemosphere.2019.06.087. Epub 2019 Jul 2.
Polybrominated diphenyl ethers (PBDEs), previously commonly used as flame retardants, should be monitored in the environment since some are listed as persistent organic pollutants. A contaminated site near a northern Taiwan factory using decabrominated diphenyl ether (deca-BDE) was identified based on a vegetable PBDEs monitoring project in 2013. The subsequent spatial and temporal survey of that contaminated site shows the contamination ingredients in soils were close to ones used by the factory, indicating that contamination was from the factory, possibly through an exhaust vent. The average concentration of deca-BDE in the main contaminated soil was 615 μg/kg d. w. (dry weight) soil in 2015, slightly decreasing to 604 μg/kg d. w. soil in 2016, increasing to 844 μg/kg d. w. soil in 2017, and then slightly decreasing to 670 μg/kg d. w. soil in 2018. The slight change of deca-BDE and the minor change in low brominated congener level indicate a low degradation rate. The contamination of peripheral sites was around 5000 μg/kg d. w. soil for one PBDEs sampling site that was higher than those around or within the main contaminated farm, indicating serious pollution. Concentrations of PBDEs in different soil depths show that depth 2-15 cm accounted for the greatest PBDEs accumulation, indicating that deca-BDE pollution had been present over time and transported into deeper soil. There can be PBDEs uptake by crops consumed by humans, as shown in our previous studies, so continuous monitoring of PBDEs in this site is important and treatments should be established urgently.
多溴二苯醚（PBDEs）曾被广泛用作阻燃剂，由于其中一些被列为持久性有机污染物，因此应在环境中进行监测。2013 年，在一项蔬菜多溴二苯醚（PBDEs）监测项目的基础上，确定了台湾北部一家使用十溴二苯醚（deca-BDE）的工厂附近存在一个污染场地。随后对该污染场地的时空调查显示，土壤中的污染成分与工厂使用的成分相近，表明污染来自工厂，可能是通过排气口。2015 年，主要污染土壤中 deca-BDE 的平均浓度为 615μg/kg（干重）土壤，略降至 2016 年的 604μg/kg d.w.土壤，2017 年增至 844μg/kg d.w.土壤，然后略降至 2018 年的 670μg/kg d.w.土壤。deca-BDE 的轻微变化和低溴代同系物水平的微小变化表明降解速率较低。周边场地的污染约为 5000μg/kg d.w.土壤，高于主要污染农田周围或内部的采样点，表明污染严重。不同土壤深度的 PBDEs 浓度表明，深度为 2-15cm 的土壤中 PBDEs 的积累量最大，表明 deca-BDE 污染已经存在了一段时间，并已向深层土壤迁移。正如我们之前的研究所示，人类食用的农作物可能会吸收 PBDEs，因此，对该场地进行持续监测非常重要，应紧急建立处理措施。
