中文摘要：

研究了不同光源和溶剂对十溴联苯醚（DecaBDE）光降解特性的影响,并对其降解产物进行了探讨。结果表明,在所试光源和溶剂条件下,DecaBDE均有一定程度的光降解,且都近似符合一级降解动力学。同一光源下,不同溶剂对DecaBDE降解表现出不同的影响。在太阳光照射下,DecaBDE降解速率为甲苯〉甲醇〉正己烷〉正己烷/丙酮〉甲醇/水〉乙醇/水;在模拟光源照射下,DecaBDE降解速率为甲苯〉甲醇〉甲醇/水〉乙醇/水〉正己烷〉正己烷/丙酮;在紫外光照射下,DecaBDE降解速率为甲苯〉甲醇〉正己烷/丙酮〉正己烷〉甲醇/水〉乙醇/水。同一溶剂中,DecaBDE降解速率均为紫外光〉太阳光〉模拟光源。尽管光源和溶剂对DecaBDE降解速率产生了一定影响,但降解途径基本一致,均为DecaBDE经光解脱溴产生低溴联苯醚。

英文摘要：

Experiments were carried out to study the effects of different light sources and solvents on the photodegradation of Decabromodiphenyl Ether （DecaBDE）.The degradation products were identified. The DecaBDE photodegradation data were represented by the first-order reaction kinetics model in each system. The degradation rate in tested solvents followed the order： toluene〉methanol〉hexane〉hexane/acetone〉methanol/water〉ethanol/water when DecaBDE was degradated by sunlight; toluene〉methanol〉methanol/water〉ethanol/water〉hexane〉hexane/acetone when DecaBDE was degradated by simulated light source; and toluene〉methanol〉hexane/acetone〉hexane〉 methanol/water〉ethanol/water when DecaBDE was degradated by UV light. In each solution,the degradation rate was strongly dependent on the light sources,and the effectiveness order was UV〉sunlight〉simulated light source. There was little difference in the degradation products,and DecaBDE were debrominated to lower brominated BDEs in all solvents and under all light sources.