Yang Chien-Ying, Chang Meei-Ling, Wu Siang Chen, Shih Yang-Hsin
Department of Agricultural Chemistry, National Taiwan University, No. 1, Sec. 4, Roosevelt Road, Taipei 106, Taiwan.
Department of Environmental Engineering, Van Nung University, No.1, Van Nung Rd., Chung-Li, Tao-yuan 326, Taiwan.
Environ Pollut. 2017 Apr;223:178-184. doi: 10.1016/j.envpol.2017.01.009. Epub 2017 Feb 3.
Polybrominated diphenyl ethers (PBDEs) are of a class of emerging contaminants. In this study, the accumulation of 4-bromodiphenyl ether (BDE-3) by different parts of a live white radish was investigated. Different cultural media (hydroponics, silica sand, and soil) were used to sustain the radish plant during its uptake and in-plant translocation of BDE-3. The results showed that BDE-3 can be translocated from the roots to the aboveground organs and the accumulated levels of BDE-3 in different parts of the white radish followed the order for the three types of cultivation: fibrous roots > peels > main roots > leaves. The results were analyzed by the aid of the partition-limited model for the plant uptake. The relevant partition coefficients (K and K) and uptake parameters of BDE-3 with plant components (K and K) were obtained for analyzing the BDE-3 distribution. The partition-limited model offers a significant insight into the uptakes of BDE-3 by the various components of live white radishes. The types of cultivation affected the total sorption level, translocation factors (TFs), extent to equilibrium (α), and root concentration factors (RCFs).
多溴二苯醚（PBDEs）是一类新出现的污染物。在本研究中，研究了活体白萝卜不同部位对4-溴二苯醚（BDE-3）的积累情况。在BDE-3的吸收和植物体内转运过程中，使用了不同的培养基（水培、硅砂和土壤）来培育萝卜植株。结果表明，BDE-3可以从根部转运到地上器官，白萝卜不同部位BDE-3的积累水平在三种栽培方式下的顺序为：须根＞果皮＞主根＞叶片。借助植物吸收的分配限制模型对结果进行了分析。获得了BDE-3与植物成分的相关分配系数（K和K）以及吸收参数（K和K），用于分析BDE-3的分布。分配限制模型为深入了解活体白萝卜各组分对BDE-3的吸收提供了重要依据。栽培方式影响了总吸附水平、转运因子（TFs）、平衡程度（α）和根浓度因子（RCFs）。
