摘要
利用高效液相色谱-串联三重四级杆质谱分析了白洋淀土壤和植物中六溴环十二烷(HBCDs)异构体和对映体的选择性富集分布及传输特征.土壤和植物样品中ΣHBCD浓度分别为1.32~8.25 ng·g^-1(干重)和N.d.~2.18 ng·g^-1(干重);在采蒲台(CPT)、圈头(QT)和范峪淀(FYD)检测到的污染物浓度较高,表明南部土壤污染较北部严重;与国内外其他区域相比,白洋淀地区HBCDs的污染水平相对较低.淀区HBCDs的富集存在显著的异构体和对映体选择性行为,γ-HBCD和α-HBCD分别是土壤和植物中的主要异构体,平均百分比贡献率分别为68.24%和44.10%;在多数土壤和植物样品中均表现出(-)-HBCD比(+)-HBCD更易于被选择性富集.ΣHBCD从土壤到植物根系的传输RCFs(根富集因子)为0.12~0.93,其中泥胡草对HBCDs的富集能力最强,荠菜最弱;植物根部到地上部的传输系数(TFs)为0.09~0.81,植物茎向传输能力为补血草>牛筋草>荠菜>泥胡草.HBCDs异构体在土壤-植物体系的RCFs与log Kow,TFs与log Kow之间均未发现显著的相关性,可能是由于植物物种的差异和复杂的真实环境的影响.本研究首次为白洋淀淀区土壤-植物体系中HBCDs的污染及其立体选择性行为提供依据,对该地区综合评估其生态安全风险和持久性有机污染物(POPs)的污染防治具有重要意义.
Diastereoisomers and enantiomers-specific enrichment,distribution and translocation of hexabromocyclododecanes(HBCDs)in soils and plants from Baiyangdian Lake were analyzed using a high-performance liquid chromatography coupled to triple quadrupole mass spectrometer.The concentrations of ΣHBCD in soil and plant were in the range of 1.32~8.25 ng·g^-1(dry weight)and N.d.~2.18 ng·g^-1(dry weight),respectively.Higher concentrations of these pollutants were detected at the sites of Caiputai(CPT),Quantou(QT)and Fanyudian(FYD),suggesting that soil pollution in the southern region of the lake was more serious than that in the north region.Compared to other areas worldwide,HBCDs concentrations in Baiyangdian Lake were at relatively low level.It is noticeable that significant diastereomer-and enantio-selective enrichment behavior of HBCDs were found in the lake.The major diastereoisomers in soil and plants wereγ-HBCD andα-HBCD,respectively,with an average percentage of 68.24% and 44.10%.(-)-HBCD was more readily to be selectively enriched than(+)-HBCD in most soil and plant samples.Root concentration factors(RCFs)of ΣHBCD from soil to plant root was in the range of 0.12~0.93,with the highest accumulation ability of Hemistepta lyrata Bunge and the lowest of Limonium sinense.Translocation factors(TFs)from root to shoot ranged from 0.09 to 0.81.The plant acropetal translocation ability was in the order of Limonium Sinense>Eleusine indica Gaertn>Capsella Bursa-pastoris>Hemistepta lyrata Bunge.No significant correlations were found between RCFs and log Kow,as well as TFs and log Kow in soil-plant system,which might be resulted from both the plant species differences and the complexity of the real environment.This study for the first time provides evidences of HBCDs contamination and their stereoselectivity behavior in the soil-plant system in Baiyangdian Lake,and is of great significance for comprehensive assessment of its regional ecological security risk,and pollution control of persistent organic pollutants(POPs).
作者
武彤
尹姗姗
刘子鑫
崔建升
鲍晓磊
李碧云
刘昱锋
WU Tong;YIN Shanshan;LIU Zixin;CUI Jiansheng;BAO Xiaolei;LI Biyun;LIU Yufeng(Pollution Prevention Biotechnology Laboratory of Hebei Province,School of Environmental Science and Engineering,Hebei University of Science and Technology,Shijiazhuang 050018;Hebei Key Laboratory of Medicinal Chemistry for Drug,Shijiazhuang 050018;Hebei Provincial Academy Environmental Science,Shijiazhuang 050037)
出处
《环境科学学报》
CAS
CSCD
北大核心
2020年第3期1051-1062,共12页
Acta Scientiae Circumstantiae
基金
国家自然科学基金(No.21876043)
河北省自然科学基金(No.B2015208042)
环境化学与生态毒理学国家重点实验室开放基金(No.KF2018-18)
关键词
六溴环十二烷
白洋淀
富集和分布
传输
立体选择性行为
hexabromocyclododecane
Baiyangdian Lake
enrichment and distribution
translocation
stereoselectivity behavior
