The Determination Of The2′-OH-BDE-68by Gas Chromatography-mass Spectrometry Method And The Adsorption Characteristics Studies On Sediments

Polybrominated diphenyl ethers(PBDEs)have been widely used in electricappliance and industrial products which is one kind of Brominated FlameRetardants(BFRs). PBDEs are implementing persistency and high lipid solubility thatoccurs abundantly in large masses. Recently, PBDEs have been found in variousenvironmental medium (soil, sediment,water and atmospheric air), biologicalsamples(fish, shellfish,birds and mammals), human blood, lipid and breast milk.OH-PBDEs and MeO-PBDEs have not only been detected as natural products，but areregarded as metabolites formed from Polybrominated diphenyl ethers(PBDEs).Recently, OH-PBDEs correlated with their bioaccumulation and toxic effects havebeen found in various environmental matrices. This paper reviews recent researchesabout the source, determination, exposure level, toxicological effects andtransformatiom pathways of OH-PBDEs.Sediment is an important environmental medium so adsorption is majortransformatiom pathways in sediment. So natural solids is one of the fundamentalprocesses controlling the transport, degradation, fate, and biological activity oforganic chemicals in the environment．Although often regarded as instantaneous formodeling purposes， sorption maybe in fact require weeks to reachequilibrium．Ignoring slow sorption kinetics can lead to an underestimation of thetrue extent of sorption，false predictions about the transport，degradation and fate ofcontaminants，and perhaps the wrong choice of cleanup technology．2 ＇-OH-BDE-68is typical participant in the study. With trimethylsilyldiazomethane as derivative agent, Gas Chromatography-Mass Spectrometry(GC-MS)is main applied and analytical method that can make a study of sorptionbehavior in sediment. In this dissertation，sorption of2 ＇-OH-BDE-68to differentsoils were studied．Sorption rate curves and sorption isotherms were obtainedbyrespective experiment．The results showed that a two（fast and slow）-compartment first-order model wasmore appropriate for describing the sorption kinetic data, compared to aone-compartment first-order model, especially in the initial sorption stage.The fast sorption was dominant during the whole sorption process frombeginning to the main sorption equilibrium.The contribution of the fast sorption to theincrease in the total sorption amount of2 ＇-OH-BDE-68was prevailing at the start of sorption process from0h to4h. while the fraction of the slow sorption becameprincipal in the subsequent stage of sorption process. The achieving time to theindividual sorption capacity for the fast sorption was much shorter than that for theslow sorption. while the contribution of the slow sorption to the total sorption amountgradually increased over time and then attained to a plateau at108h.The sorption rate constant of2 ＇-OH-BDE-68in sediment#2and#3arerespectively0.3、0.18， and sedimentl organic carbon decreased in the ordersediment2#<sediment3#.It suggested that the effects of sediment properties betweenorganic carbon and sorption rate constant.To sorption isotherms, there are two modles of linear partitioning model andnonlinear Freundlich model that the result fit the modle in the study.