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首页> 外文会议>International symposium on halogenated persistent organic pollutants >DIRECT PHOTOLYSIS OF 4'-HYDROXYLATED-2, 2', 4-TRIBROMODIPHENYL ETHER (4'-OH-BDE-17) AND THE REACTIVITY WITH ·OH AND SO4·-
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DIRECT PHOTOLYSIS OF 4'-HYDROXYLATED-2, 2', 4-TRIBROMODIPHENYL ETHER (4'-OH-BDE-17) AND THE REACTIVITY WITH ·OH AND SO4·-

机译：4'-羟基2、2'，4-三溴二苯醚（4'-OH-BDE-17）的直接光解及与·OH和SO4·-的反应性

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摘要

Hydroxylated polybrominated diphenyl ethers (OH-PBDEs) are emerging as ubiquitous environmental contaminants with great environmental risk. To study the environmental transformation of OH-PBDEs, 4'-OH-BDE-17 was synthesized and selected as a model compound. Direct photolysis of the compound and its reactivity with hydroxyl radicals (·OH) and sulfate radicals (SO4·-) were investigated. The photodegradation of 4'-OH-BDE-17 in water took place under the light with the wavelength greater than 290 nm, and the photolytic kinetics was markedly affected by the solution pH. Alkali greatly facilitated the direct photolysis. The half-lives (t1/2) of 4'-OH-BDE-17 at pH = 6.6 and pH = 3.0 were 28 times and 32 times longer than that at pH = 10, respectively. The reaction rate constant of 4'-OH-BDE-17 with ·OH was 7.08 × 109 M-1 s-1, indicating that the reaction with ·OH may be an important transformation pathway of 4'-OH-BDE-17 in water. A fast reaction rate constant with SO4 ·- was observed, with the t1/2 to be 9.5 ± 0.7 min. This study will be helpful to understand the environmental fate of OH-PBDEs.
机译：羟基化多溴联苯醚（OH-PBDEs）作为普遍存在的环境污染物正在出现，具有很大的环境风险。为了研究OH-PBDEs的环境转化，合成了4'-OH-BDE-17并选择为模型化合物。研究了该化合物的直接光解及其与羟基自由基（·OH）和硫酸盐自由基（SO4·-）的反应性。水中4'-OH-BDE-17在波长大于290 nm的光下发生光降解，溶液的pH值显着影响光解动力学。碱极大地促进了直接光解。在pH = 6.6和pH = 3.0时4'-OH-BDE-17的半衰期（t1 / 2）分别是在pH = 10时的28倍和32倍。 4'-OH-BDE-17与·OH的反应速率常数为7.08×109 M-1 s-1，表明与·OH的反应可能是4'-OH-BDE-17在·OH中的重要转化途径。水。观察到与SO4·-的快速反应速率常数，t1 / 2为9.5±0.7分钟。这项研究将有助于理解OH-PBDEs的环境命运。

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  • 来源
  • 会议地点 Beijing(CN)
  • 作者

    Zhao D M; Xie Q; Zhao H X; Chen J W; Qiao X L; Zhang S Y;

  • 作者单位

    Key Laboratory of Industrial Ecology and Environmental Engineering (MOE),Department of Environmental Science and Technology,Dalian University of Technology,Linggong Road 2,Dalian 116024,P. R. China;

    Key Laboratory of Industrial Ecology and Environmental Engineering (MOE),Department of Environmental Science and Technology,Dalian University of Technology,Linggong Road 2,Dalian 116024,P. R. China;

    Key Laboratory of Industrial Ecology and Environmental Engineering (MOE),Department of Environmental Science and Technology,Dalian University of Technology,Linggong Road 2,Dalian 116024,P. R. China;

    Key Laboratory of Industrial Ecology and Environmental Engineering (MOE),Department of Environmental Science and Technology,Dalian University of Technology,Linggong Road 2,Dalian 116024,P. R. China;

    Key Labo;

  • 会议组织
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 环境分析化学;
  • 关键词

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