酞酸酯在模拟海河菹草微宇宙中的消减和分布特征

Removal and Distribution of Phthalate Acid Esters in Potamogeton crispus L. Microcosm of Haihe River

模拟海河干流水体构建了室内菹草微宇宙,同时设置了无菹草微宇宙为对照,对微宇宙中酞酸二丁酯(DBP)和酞酸二异辛酯(DEHP)的消减和分布特征进行了研究.结果表明,实验过程中,有草组水和沉积物中这2种酞酸酯(PAEs)的浓度始终低于对照组;实验结束时,这2种PAEs主要分布在沉积物中,其次是水中,并且在菹草中也有一定程度的富集,尤其是疏水性较强的DEHP;菹草(以湿重计)对水中DBP和DEHP富集系数(BCF)的平均值分别为22.4 L.kg-1和180.7 L.kg-1;计算得出整个实验过程中,有草微宇宙中DBP和DEHP的降解率分别为输入量的94.2%和60.8%,较对照组(DBP和DEHP分别为91.0%和45.5%)分别提高了4.1和15.3个百分点;有草组DBP和DEHP的残留率分别为输入量的-0.6%和30.7%,而对照组为4.7%和37.7%.可见,菹草体系不仅能够有效增强这2种PAEs的降解作用,还能减少系统残留量,降低内源污染.

Removal and distribution characteristics of dibutyl phthalate（DBP） and di（2-ethylhexyl） phthalate（DEHP） were studied by an indoor Potamogeton crispus L.microcosm simulating the mainstream of Haihe River.An unplanted microcosm was set as a control.The results showed that concentrations of the two phthalate acid esters（PAEs） in water and sediments from the Potamogeton crispus L.microcosm were lower than those from the control microcosm during the experiment.At the end of the experiments,the two PAEs mainly distributed in the sediment,and followed by water.The two PAEs,especially DEHP which is a stronger hydrophobic compound,could be enriched in Potamogeton crispus L..The average enrichment coefficients（BCF） of Potamogeton crispus L.were 22.4 L·kg-1 for DBP and 180.7 L·kg-1 for DEHP.Removal efficiencies of loaded DBP and DEHP in the Potamogeton crispus L.microcosm（94.2% for DBP,60.8% for DEHP） were 4.1 and 15.3 percentage points higher than those in the control microcosm（91.0% for DBP,45.5% for DEHP）.The retained percentages of loaded DBP and DEHP were-0.6% and 30.7% in the Potamogeton crispus L.microcosm,and 4.7% and 37.7% in the control microcosm,respectively,indicating that Potamogeton crispus L.can not only enhance the degradation of the two PAEs,but also decrease the amount of their residue,reducing the internal pollution sources.