Determination of photochemically produced hydroxyl radicals in seawater and freshwater

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	Determination of photochemically produced hydroxyl radicals in seawater and freshwater
	Xianliang Zhou ; and Kenneth Mopper
发表期刊	Marine Chemistry
ISSN	0304-4203
	1990
卷号	30 页码:71-88
通讯作者	Kenneth Mopper
英文摘要	A variety of short-lived, reactive chemical species (i.e. free radicals and excited state species) are known to be photochemically produced in natural waters. Some of these transients may strongly affect chemical and biological processes, and they have been implicated in the degradation of organic pollutants and natural organic compounds in aqueous environments. Previous studies demonstrated that the highly reactive hydroxyl radical (OH) is photochemically formed in seawater. However, the quantitative importance of this key species in the sea has not been previously studied because of past analytical limitations. By using a highly sensitive probe based on α-H atom abstraction from methanol, we were able to measure production rates and steady-state concentrations of photochemically produced OH radicals in coastal and open ocean seawater and freshwaters. The validity of the method was tested by intercalibrating with an independent, OH-specific reaction, hydroxylation of benzoic acid, and also by competition kinetics experiments. Our OH production rates and steady-state concentrations for freshwaters are in excellent agreement with those measured by previous investigators for similar waters. In contrast, for seawater, the values we measured are 1–3 orders of magnitude higher than previously predicted by models, indicating that there is a major unknown photochemical OH source (s) in seawater.
语种	英语
文献类型	期刊论文
条目标识符	http://ir.yic.ac.cn/handle/133337/3075
专题	科研共享资源
推荐引用方式 GB/T 7714	Xianliang Zhou,and Kenneth Mopper. Determination of photochemically produced hydroxyl radicals in seawater and freshwater[J]. Marine Chemistry,1990,30:71-88.
APA	Xianliang Zhou,&and Kenneth Mopper.(1990).Determination of photochemically produced hydroxyl radicals in seawater and freshwater.Marine Chemistry,30,71-88.
MLA	Xianliang Zhou,et al."Determination of photochemically produced hydroxyl radicals in seawater and freshwater".Marine Chemistry 30(1990):71-88.

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