Plant uptake of atmospheric brominated flame retardants at an E-waste site in southern China.
Plant uptake of atmospheric brominated flame retardants at an E-waste site in southern China.
复制标题
DOI：
10.1021/es203669n
复制
发表时间：
2012-02
影响因子：
11.4
通讯作者：
Mi Tian;Shejun Chen;Jing Wang;Yong Luo;Xiaojun Luo;B. Mai
中科院分区：
文献类型：
--
作者：
Mi Tian;Shejun Chen;Jing Wang;Yong Luo;Xiaojun Luo;B. Mai
2007-2008 年，我们在中国南方的一个电子垃圾场测量了桉树叶和松针以及这两种树种的叶表面颗粒 (LSP) 中的溴化阻燃剂 (BFR)。桉叶和松针中总 BFR 的月浓度分别为 30.6-154 ng/g 干重和 15.1-236 ng/g 干重，冬春季节相对较高。对 BFR 浓度进行了相关分析，并对植物和 LSP、空气（气态和颗粒结合相）以及环境变量之间的 PBDE 成分进行了比较。结果表明，植物中的 BFR，特别是溴化程度较低的 BFR，与 LSP 中的 BFR 呈正相关，与气态 BFR 和环境温度呈负相关。工厂中的 PBDE 分布与低溴 BDE（二至六 BDE）的气态分布以及高溴 BDE（七至十 BDE）的 LSP 分布相似。将 McLachlan 的框架应用于我们的数据表明，BFR 的吸收主要受具有对数辛醇-空气分配系数 (K(OA)) 13 的化合物的气体分配平衡控制。对于多溴二苯醚，观察到植物/空气分配系数 (K(PA)) 和 K(OA) 之间的不同关系，这取决于吸收机制 （多溴联苯醚）。本文补充了目前关于植物吸收环境中 K(OA) 相对较高的半挥发性有机化合物的因素和机制的知识。
Brominated flame retardants (BFRs) were measured in eucalyptus leaves and pine needles as well as the leaf surface particles (LSPs) of the two species at an e-waste site in southern China in 2007-2008. The monthly concentrations of total BFRs in the eucalyptus leaves and pine needles were in range of 30.6-154 and 15.1-236 ng/g dry weight, respectively, and relatively higher concentrations were observed in winter and spring. Correlation analysis of BFR concentrations and comparison of PBDE compositions between the plants and LSPs, air (gaseous and particle-bound phases), and ambient variables were conducted. The results revealed that BFRs in the plants, especially for less brominated BFRs, showed positive relationships with BFRs in the LSPs and negative relationships with the gaseous BFRs and ambient temperature. The PBDE profiles in the plants were similar to the gaseous profile for low brominated BDEs (di- through hexa-BDEs) and to the LSP profiles for highly brominated BDEs (hepta- through deca-BDEs). Applying McLachlan's framework to our data suggests that the uptake of BFRs was controlled primarily by gaseous partitioning equilibrium for compounds with log octanol-air partition coefficients (K(OA)) 13. Different relationships between the plant/air partition coefficient (K(PA)) and K(OA), which depend on the uptake mechanisms, were observed for polybrominated diphenyl ethers (PBDEs). This paper adds to the current knowledge of the factors and mechanisms governing plant uptake of semivolatile organic compounds with relatively high K(OA) in the environment.