2,4,4'-三溴联苯醚的光降解研究

Photodegradation of 2,4,4'-tribromodiphenyl ether

以固相微萃取(SPME)结合气相色谱(GC)、气相色谱-质谱联用(GC/MS)技术作为分析检测手段,研究光源、有机溶剂、无机盐与腐殖酸对BDE-28光降解的影响,实验结果表明,光源是影响其降解的主要因素,其次,丙酮、铜离子和腐殖酸对其降解的影响较显著.光源对BDE-28光降解速率的影响为300 W汞灯>500 W金卤灯>100 W汞灯>>500 W氙灯;有机溶剂对BDE-28降解速率的影响为甲醇/水(1∶1)>甲醇>己烷>甲苯>乙腈>>丙酮;无机离子的影响各有差别:K+、Na+、SO2-4、NO-3、Cl-对BDE-28降解影响不明显,而Fe3+、NH+4促进BDE-28的降解,Fe2+、Cu2+、Br-抑制BDE-28的降解;腐殖酸抑制BDE-28的降解.

The effects of light sources,solvents,inorganic salts and humic acid on the photodegradation of BDE-28 were studied by using solid-phase micro-extraction（ SPME） combined with chromatography（ GC） and chromatography / mass spectrometry（ GC / MS）. The results indicated that light source was a major influencing factor,followed by acetone,Cu^2＋and humic acid. The degradation rate of BDE-28 was impacted by different light sources significantly,which was consistented with the sequence： 300 W mercury lamp 〉500 W halide lamp 〉100 W mercury lamp 〉〉500 W xenon lamp; and the influence of solvents for BDE-28 degradation rate was methanol / water（ 1∶1） 〉methanol 〉hexane 〉toluene 〉〉acetonitrile acetone. However,the degradation of BDE-28 was various with different inorganic salts. There was a little change on BDE-28 degradation with K^＋,Na^＋,SO4^2-,NO3^-and Cl^-,but a significant acceleration was detected by adding Fe^3＋and NH4^＋,nevertheless,the inhibition of Fe^2＋,Cu^2＋and Br^-was found as well as humic acid.