我国典型电子废弃物拆解地农田土壤中的多溴联苯醚

发布时间：2018-06-09 07:08

本文选题：多溴联苯醚 + 农田土壤　；参考：《环境科学学报》2016年12期

【摘要】：选择我国主要电子垃圾拆解地清远龙塘-石角地区作为研究区,以14种多溴联苯醚(Polybrominated Diphenyl Ethers,PBDEs)化合物为研究对象,探讨了PBDEs化合物在龙塘-石角地区农田土壤中的含量、同系物组成及空间分布状况,分析了土壤TOC、土地利用方式(水旱轮作)等对农田土壤PBDEs含量特征的影响.结果表明,清远龙塘-石角地区农田土壤中14种PBDEs化合物的总量平均为(19.0±20.1)ng·g-1(以干重计),明显低于来自路边、拆解中心、居民区等表土中的PBDEs含量.研究区农田土壤中PBDEs的空间分布与土壤TOC呈现出一致性特征,当去除TOC的影响后,作为点源的电子垃圾拆解地成为土壤PBDEs分布的关键控制因素.水旱轮作的土地利用方式下,在一个轮作周期内,当轮作为水稻且土壤处于淹水状态时土壤中的PBDEs含量最低.总体来看,农田土壤中的PBDEs动态受土壤水含量、作物种植情况、土壤水旱状态等多因素的综合影响,表现出不确定的变化特征.本文的研究成果对土壤-作物系统PBDEs的行为研究进行了补充,并可为完善现有的土地质量评估体系提供基础资料.
[Abstract]:In the study area of Qingyuan Long Tong - Shi Jiao area, Qingyuan, the main electronic waste dismantling area, 14 polybrominated diphenyl ethers (PBDEs Ethers, PBDEs) were used as the research object. The content, homologous composition and spatial distribution of PBDEs compounds in the farmland soil of Long Tang Shi Jiao area were discussed, and the soil TOC and land were analyzed. The results showed that the total amount of 14 PBDEs compounds in farmland soil in Qingyuan Long Tang Shi Jiao area was (19 + 20.1) ng / g-1 (dry weight), which was obviously lower than the PBDEs content from roadside, dismantling Center, residential area and other topsoil, and PBDEs in farmland soil in the study area. The spatial distribution is consistent with the soil TOC. When the effect of TOC is removed, the dismantling of electronic waste as a point source is the key control factor of soil PBDEs distribution. Under the land use mode of water and drought rotation, the PBDEs content in the soil is the lowest when the wheel is the rice and the soil is in the flooded state. In general, the dynamic of PBDEs in farmland soil is influenced by many factors such as soil water content, crop planting and soil water and drought condition. The results of this paper supplement the behavior research of soil crop system PBDEs, and provide the basis for improving the existing land quality assessment system. Information.
【作者单位】：国家地质实验测试中心中国地质科学院生态地球化学重点开放实验室;中国科学院地理科学与资源研究所;
【基金】：国家自然科学基金(No.41171370,21307018) 中国地质调查局地质调查项目(No.1212011220058)~~
【分类号】：X53

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