中文摘要：

4-bromdiphenyl 醚(BDE-4 ) 的降级特征在不同答案被调查。学习显示这混合物的直接降级的过程依赖于溴和电子横梁连接到 diphenyl 的醚契约。激光闪光光分解作用被采用决定每种的降级(cationic，中立，并且 anionic ) 。从这些数据， BDE-4 降级的中间的产品为直接照耀降级被显示出。中立激进分子在这些混合物的光分解作用期间被形成。为所有混合物， diphenyl 醚和 hydroxybiphenyl 作为普通产品被观察。在电子横梁下面的 BDE-4 的反应是 debromide。在 pH=5.5 的 BDE-4 的 debromide 率是比在 pH=10.0 的 BDE-4 的有点低的。为 BDE-4 的分解率在 14 kGy 的剂量上的 pH=10.0 是 99.8% 。从它的基的 BDE-4 能提供溴离子进水和快速形成的 BDE-4 的阳离子基与氢基和形成的苯基醚一起重新结合。

英文摘要：

The degradation characteristic of 4-bromdiphenyl ether （BDE-4） was investigated in different solutions.The study indicates that the process of direct degradation of this compound is dependent upon the bromine and the ether bond connected to diphenyl by electron beam.laser flash photolysis was employed to determine the degradation of each species （cationic,neutral,and anionic）.From these data,intermediate products of BDE-4 degradation were shown for direct irradiationdegradation.The neutral radical was formed during the photolysis of these compounds.For all the compounds,diphenyl ether and hydroxybiphenyl were observed as common products.Reaction of the BDE-4 under electron beam was debromide.The debromide rate of BDE-4 at pH=5.5 is somewhat lower than that of BDE-4 at pH=10.0.The decomposition rate for BDE-4 is 99.8% at pH=10.0 on the dose of 14 kGy.BDE-4 from its radical could provide bromine ion into water and the cation radical of BDE-4 formed quickly recombine with hydrogen radical and formed phenyl ether.