超氧(O3)又称"臭氧"，英文为「OZONE」。(臭氧O3)是1785年德国科学家冯马鲁姆发现，其特点为电为高、不稳定、蓝色、溶解性强，散发出一种淡淡的腥味。雷电暴雨过后的森林散发的清腥味即为"臭氧"，自然空气中臭氧浓度约0.01~0.04PPM是一种"实际无毒无色气体"，对人类的健康有相当的保护作用。
在充氧的溶液中检测到了超氧负离子自由基。
The superoxide anion radical was detected in the aerated solution.
还原剂的存在降低了单重态氧的生成并引起了超氧负离子自由基的生成。
The singlet oxygen production was decreased and superoxide anion radical production was initiated in the presence of reducing agents.
血液和脑实质能产生超氧负离子，这大概与血液分解产物包括三价铁有关。
Both blood and brain parenchyma have been shown to generate superoxide anion, probably related to blood breakdown products including ferric iron.
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