EVIDENCE FOR PHOTOCHEMICAL GENERATION OF SUPEROXIDE ION IN HUMIC WATERS
EVIDENCE FOR PHOTOCHEMICAL GENERATION OF SUPEROXIDE ION IN HUMIC WATERS
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DOI：
10.1038/306575a0
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发表时间：
1983-01-01
期刊：
影响因子：
64.8
通讯作者：
CAREY, JH
中科院分区：
文献类型：
--
作者：
BAXTER, RM;CAREY, JH
在可见光或近紫外光照射下，天然腐殖质水中的有色物质会发生多种反应。它们可能被漂白和部分降解1-3，可能是通过涉及铁的氧化和还原的循环机制4，或者它们可能产生各种自由基5或作为产生单线态氧的敏化剂6-8。它们还可能产生过氧化氢9-11。有人提出10,11实际的光化学过程可能是超氧离子的产生，而过氧化氢是由超氧离子的歧化产生的。我们在此提出了天然水中超氧离子 O2·− 光化学生成的更直接证据。
On irradiation with visible or near UV light the coloured substances in natural humic waters can undergo several reactions. They may be bleached and partially degraded1–3, perhaps by a cyclic mechanism involving oxidation and reduction of iron4, or they may generate a variety of free radicals5or serve as sensitizers for the generation of singlet oxygen6–8. They may also bring about the generation of hydrogen peroxide9–11. It has been suggested10,11that the actual photochemical process may be the generation of superoxide ion, and that hydrogen peroxide is produced by the dismutation of this. We present here more direct evidence for the photochemical generation of superoxide ion, O2·−, in natural waters.