东江表层沉积物中的有机磷系阻燃剂

Organophosphorus flame retardants in surface sediments from Dongjiang River

采用索氏抽提,HLB固相萃取柱分离净化和气相色谱质谱联用仪（GC-MS-EI/SIM）的分析方法对采自东江的17个沉积物中的8种有机磷系阻燃剂（OPFRs）的浓度及分布进行研究.结果表明,所有样品中均检测到了 OPFRs,其总浓度为1.52～86.17ng/g.三（1-氯-2-丙基）磷酸酯（TCPP）为最主要污染物,最高浓度达51.64ng/g,其后为三苯基磷酸酯（TPP）、三（2-氯乙基）磷酸酯（TCEP）、三（1,3-二氯异丙基）磷酸酯（TDCP）,最高浓度分别为22.03,9.51,6.09ng/g,而其他烷基类OPFRs除三乙基磷酸酯（TEP）外未被检出.OPFRs总浓度和与总有机碳（TOC）存在极显著的相关性（r=0.74,P＜0.001）,说明沉积物中TOC的含量对有机氯代磷系阻燃剂的分布起重要作用.尽管东江沉积物中的OPFRs含量（均值25.43ng/g）远低于多溴联苯醚（PBDEs）含量（均值588ng/g）,但随着PBDEs的全球禁用,相关有机磷系阻燃剂的污染态势需要引起更多关注.

Levels and distributions of eight organophosphorus flame retardants （OPFRs） in 17 sediment samples collected from Dongjiang River were investigated. The analytes were Soxhlet extracted, enriched using HLB solid-phase extraction, and determined by gas chromatography-mass spectrometry. OPFRs were detected in all the sediments at concentrations ranging from 1.52～6.17ng/g. Tris （2-chloroiso-propyl） phosphate （TCPP） was the dominant compound, the highest concentration was 51.64ng/g, followed by TPP, TCEP and TDCP with highest concentrations 22.03,9.51 and 6.09ng/g, respectively. The other alkyled OPFRs were not detected, with the exception of triethyl phosphate （TEP）. Highly significant correlation（r=0.74,P〈0.001） between the concentrations of OPFRs and total organic carbon （TOC） was observed, indicating that TOC play a key role in determination of chlorinated OPFRs levels in the sediments. Although the total concentrations of the assessed OPFRs （average value of 25.43ng/g） were much lower than those of PBDEs （average value of 588ng/g）, more environment concerns should be given for these emerging pollutants with the ban of the PBDEs in the worldwide.