水体中悬浮颗粒物对十溴二苯醚的吸附/解吸特性研究

采用室内试验法,以沉积颗粒物和浮游植物颗粒(铜绿微囊藻和普通小球藻)作为水体中悬浮颗粒物(SPM),研究了SPM对十溴二苯醚(BDE-209)的吸附/解吸特性.结果表明,沉积颗粒物和浮游植物颗粒对BDE-209的吸附分别在1.5h和0.5h内达到最大,在3h内可以充分达到平衡;沉积颗粒物和浮游植物颗粒对BDE-209的吸附能力存在差异,这与颗粒物中有机质的浓度和类型有关;在实验浓度范围内,BDE-209在SPM上的吸附可用Freundlich等温吸附方程较好地拟合;解吸过程表现出一定的迟滞性,且沉积颗粒物比浮游植物颗粒物具有更明显的迟滞性;pH中性、温度20～30℃的水体有利于SPM对BDE-209的吸附.

Behaviors of Sorption-Desorption of Decabrominated Diphenyl Ether on Suspended Particulate Matter in Lake Water

Behaviors of sorption-desorption of decabrominated diphenyl ether(BDE-209)on the two kinds of suspended particulate matter(SPM),suspended sediment particulate and phytoplankton particulate(Microcystis aeruginosa,Chlorella vulgaris),in lake water were studied in the laboratory.Results showed that the greatest sorption of BDE-209 was occurred in 1.5h for suspended sediment and 0.5h for phytoplankton.The sorption equilibrium of BDE-209 was reached adequately in 3h.Sorption ability on SPM was related to the concentration and property of organic matter in the SPM.The sorption isotherm curve of BDE-209 on SPM could be well described by Freundlich equation.The SPM was found to exhibit significant desorption hystersis phenomenin,and the extent of hystersis for suspended sediment particulate was obviously larger than phytoplankton particulate.Also,the results showed that sorption of BDE-209 on SPM was significantly observed in neutral lake water at 20~30℃.