Jiao Xingchun, Tang Qifeng, Chen Shu, Deng Yajia, Cao Hongying, Wang Guang, Yang Yongliang
Key Laboratory of Ministry of Land and Resources for Eco-geochemistry, National Research Center for Geoanalysis, Xicheng District, 26 Baiwanzhuang Street, Beijing, 100037, China.
Institute of Geographic Sciences and Natural Resources Research, Beijing, 100101, China.
Environ Sci Pollut Res Int. 2016 Jul;23(13):13137-46. doi: 10.1007/s11356-016-6442-6. Epub 2016 Mar 23.
The concentration and temporal trend of PBDEs in farmland soil during a circle of crop rotation period within an e-waste dismantling area of South China were investigated. The averaged current concentration of total PBDEs in the farmland soil was averaged 19.1 ± 20.7 ng/g dry weight, which was much lower than the PBDE level in roadside soil and in topsoil near e-waste dismantling sites. Spatial distribution of total PBDEs concentration in the study area showed higher level at the field near e-waste workshops and lower at the distanced farmland area. Soil organic carbon content was significantly correlated with concentration of BDE209 (r = 0.704, p < 0.01), but not related with the sum concentration of other PBDE compounds (r = 0.097, p > 0.1). During the whole crop rotation circle, the temporal concentration of PBDEs in the farmland soil was highest (25.3 ± 11.4 ng/g dry wt.) in April when early paddy had been transplanted for 1 or 2 weeks. When the crop rotated to autumn peanut in August and the land is turning dry, the PBDEs concentration in farmland soil reached the lowest level which was 8.1 ± 1.2 ng/g dry wt. The temporal trend of PBDEs in farmland soil was not consistent with that of atmospheric PBDEs and soil total organic carbon (TOC) content during the rotation cycle. It was concluded that the dynamics of PBDEs in the farmland soil is influenced by multiple, interacting factors, and not clearly related to neither the atmospheric deposition nor the organic carbon content of the soil, but possibly related to the micro-environmental conditions changed by crop rotation process.
对中国南方电子垃圾拆解区一轮作物轮作期内农田土壤中多溴二苯醚（PBDEs）的浓度及时间趋势进行了调查。农田土壤中总多溴二苯醚的平均当前浓度为19.1±20.7纳克/克干重，远低于路边土壤和电子垃圾拆解场附近表土中的多溴二苯醚水平。研究区域内总多溴二苯醚浓度的空间分布显示，靠近电子垃圾车间的田地含量较高，而距离较远的农田区域含量较低。土壤有机碳含量与BDE209的浓度显著相关（r = 0.704，p < 0.01），但与其他多溴二苯醚化合物的总浓度无关（r = 0.097，p > 0.1）。在整个作物轮作周期中，农田土壤中多溴二苯醚的时间浓度在4月早稻移栽1或2周时最高（25.3±11.4纳克/克干重）。当8月作物轮作到秋花生且土地变干时，农田土壤中的多溴二苯醚浓度达到最低水平，为8.1±1.2纳克/克干重。轮作周期内农田土壤中多溴二苯醚的时间趋势与大气多溴二苯醚和土壤总有机碳（TOC）含量的趋势不一致。得出的结论是，农田土壤中多溴二苯醚的动态受到多种相互作用因素的影响，与大气沉降和土壤有机碳含量均无明显关系，但可能与作物轮作过程中微环境条件的变化有关。
