摘要
利用气质联用仪(GC-NCI-MS)对中国川藏地区饮用水、表土和青稞样品中PBDEs(包括十溴联苯醚在内)和TBBPA的含量进行了检测,分析了PBDE同系物的分布模式,比较研究了不同区域的溴系阻燃剂(BFRs)的污染水平、可能来源和环境影响因素.结果显示,西藏地区饮用水中均未检出PBDEs和TBBPA.表土样品中∑13PBDEs的含量范围为0.87~10.56 ng·kg-1(以干重计),PBDE主要同系物为BDE-15、209、47和99(所有样品中100%检出),分别占∑13PBDE含量的39.0%、16.5%、10.5%和10.5%.另外,研究发现,土壤中∑13PBDEs与TBBPA的含量显著相关,暗示了它们相似的空间分布,且PBDEs和TBBPA均与TOC值显著相关,PBDEs和TBBPA与海拔高度呈显著线性关系.这表明川藏地区土壤中PBDEs和TBBPA的污染为同一来源,且其含量不仅受TOC值和海拔高度的影响,也可能受与PBDE和TBBPA有关的大气传输、稀释或吸附、沉降多种因素影响.在偏远地区的农作物青稞中检测到了PBDEs和TBBPA,可能是通过大气沉降到农作物表面,被生物富集和吸收.青稞为该地区居民主食的原料,尽管PBDEs和TBBPA的含量非常低,但可能对当地居民健康产生影响.
PBDEs(including BDE-209) and TBBPA in drinking water,surface soil and crop samples collected from Sichuan-Tibet region were measured by GC-NCI-MS to investigate their levels,distribution,and possible sources in this region.The results showed that the levels of ∑13PBDEs in surface soil samples ranged from 0.87 to 10.56 ng·kg-1(dry weight).The rates of contributions of major PBDE congeners BDE-15,209,47 and 99 were 39%,16.5%,10.5% and 10.5%,respectively.The significant positive relationship between concentrations of total PBDEs and TBBPA and their similar altitudinal patterns reflected that they might be from the same pollution source.Additionally,the concentrations of PBDEs and TBBPA showed significant correlations with TOC value and the altitude.This indicated that concentrations of PBDEs and TBBPA in the surface soils were affected not only by TOC contents and the altitude but also by other factors,including atmospheric transmission,dilution /adsorption,and precipitation mechanisms associated with PBDEs and TBBPA.PBDEs and TBBPA were detected in the hulless barley in the remote areas.These pollutants were likely to be deposited by the atmospheric absorption onto the surface of crops,then absorbed and bioaccumulated in crops.As the hullness barley is the main raw materials of food in this region,PBDEs and TBBPA may have an impact on the health of local residents although the concentrations are very low.
出处
《环境科学学报》
CAS
CSCD
北大核心
2014年第11期2823-2831,共9页
Acta Scientiae Circumstantiae
基金
环保公益性行业科研专项(No.201309047,201309030)
国家自然科学基金(No.41001316,41371467,40901148)
中央高校基本科研业务费(No.WB1214059)~~
关键词
多溴联苯醚
青藏高原地区
饮用水
表土
青稞
污染源
PBDEs
Sichuan-Tibet region
drinking water
surface soil
hulless barley
pollution source
