用对苯二甲酸测定铜催化Fenton反应产生的羟自由基  

DETERMINATION OF ·OH GENERATED IN COPPER ION CATALYZED FENTON REACTION BY TEREPHTHALATE

作　　者：淮清[1] 李久强[1] 方兴旺[1] 

机构地区：[1]北京大学技术物理系

出　　处：《辐射研究与辐射工艺学报》1998年第4期193-197,共5页Journal of Radiation Research and Radiation Processing

基　　金：国家自然科学基金

摘　　要：研究了剂量率对对苯二甲酸剂量计的影响和该剂量计用于测定铜催化的类Ｆｅｎｔｏｎ反应产生羟自由基的速率的可行性。羟自由基与对苯二甲酸（ＴＡ）加成生成的自由基被Ｏ２氧化成具有很强荧光的稳定产物羟基对苯二甲酸（ＨＯＴＡ）。在很广的剂量率范围内（８．２×１０－３～１．６Ｇｙｓ－１），Ｇ（ＨＯＴＡ）恒定。Ｃｕ２＋的存在使Ｇ（ＨＯＴＡ）降低。但当［Ｃｕ２＋］≤［ＴＡ］／１０时，Ｇ（ＨＯＴＡ）不随［Ｃｕ２＋］变化而变化，因此，对苯二甲酸剂量计可用来测定铜催化的类Ｆｅｎｔｏｎ反应产生的羟自由基。The effect of dose rate on the radiation chemical yield of hydroxyterephthalate (HOTA) in the radiolysis of aerated terephthalate(TA) aqueous solution has been investigated, and the generation of ·OH by copper ion catalyzed Fenton reaction has been evaluated with the help of TA. No significant difference in the G(HOTA) was observed at dose rate ranging from 8.2×10 -3 to 1.6Gy s -1 . The presence of Cu 2+ at concentration less than 1/10 of lowers the G(HOTA) to 0.53, however G(HOTA) does not change with [Cu 2+ ] added. As indicated by the formation of HOTA, the “·OH” generated by the Fenton type reaction catalyzed by copper ion is different from that generated radiolytic, the former is rather localized and therefore difficult to be scavenged by TA.

关 键 词：对苯二甲酸剂量计 类FENTON反应 羟自由基 

分 类 号：TL818.5[核科学技术—核技术及应用] Q503[生物学—生物化学]