In UV/ H2 O2 process,effects of H 2 O2 concentration and water quality parameters on degradation of ibuprofen (IBU)were investigated. Furthermore,changes of IBU degradation,TOC removal and toxicity were studied,and photoproducts of IBU were also analyzed. Toxicity of IBU and its reaction samples were evaluated by bioluminescence inhibition using vibrio fischeri,and EC 50,15 min value of IBU was 68 mg / L. In UV direct photolysis,biological toxicity increased gradually with the degradation of IBU,while TOC had no change. when UV fluence was 3 816 mJ / cm2 ,41% of IBU was degraded,and the inhibition rate increased from 17. 48% to 43. 58% . In UV/ H2 O2 advanced processes,both toxicity and TOC were decreased with the degradation of IBU. When UV fluence was 7 632 mJ / cm2 ,all of IBU degraded,and the inhibition rate decreased from 18. 20% to 0. 8%,while TOC only began to decrease. Several photoproducts such as terephthalic acid,malonic acid,propionic acid,benzoic acid,glycerol and other small molecular carboxylic acid forming in this process were identified by GC MS. In UV/ H2 O2 processes,detoxification was much easier than mineralization,and the optimal time for degradation of pollutants in UV/ H 2 O2 process would be determined by parent compound degradation and toxicity changes.%考察了 UV／ H2 O2体系中，H2 O2投加量、水质参数对布洛芬（IBU）降解的影响。同时研究了该体系中，IBU降解、TOC去除及物质生物毒性三者的变化，并分析了降解产物的生成情况。结果表明 IBU 对 T3发光杆菌有较大的抑制发光作用， EC50，15 min为68 mg ／ L。UV直接光解，随着 IBU的降解，物质生物毒性逐渐增大，而 TOC 无变化。当紫外剂量达到3816 mJ ／cm2时，IBU降解41％，反应液对发光菌的发光抑制率由17．48％升至43．58％。随着 IBU的降解，物质生物毒性和 TOC均逐渐减小。当紫外剂量达到7632 mJ ／ cm2时，IBU 全部降解，TOC 开始下降，反应液对发光菌的发光抑制率由18．20％降至0.8％。GC MS分析检测表明此过程 IBU降解生成对苯二甲酸、丙二酸、丙酸、苯甲酸、丙三醇等小分子羧酸。UV／ H2 O2体系中，污染物脱毒比矿化容易，母体污染物的降解及物质生物毒性的去除是决定该工艺最佳反应时间的关键因素。
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