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- W83512784 abstract "Carbon-centered radicals have been proposed as important intermediates in the sunlight-initiated breakdown of marine dissolved organic matter (DOM). As such, determination of rates of formation of these radicals should afford an initial estimate of the total rate of photochemical breakdown of DOM in seawater. This estimate can then be used to assess the relative importance of this process in the overall oceanic carbon cycle. Unfortunately, this calculation has not been made since the detection of carbon-centered radicals in seawater at extremely low steady-state concentrations has proven to be a formidable task. We have recently developed a highly sensitive method for the simultaneous detection of arrays of carbon-centered radicals in aqueous systems (Kieber and Blough, 1989). Radicals are efficiently trapped by an amino-nitroxide to form stable products that are then reacted with fluorescamine to produce highly fluorescent adducts. The adducts are easily separated by high performance liquid chromatography. Here we will discuss our initial results on the photochemical formation of carbon-centered radicals in seawater using this technique. This is the first evidence for the existence of these highly transient intermediates in seawater. We will also discuss the potential of this technique to estimate the photochemical oxygen demand, and to predict somemore » of the photochemical products formed during the photochemical breakdown of DOM in seawater.« less" @default.
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- W83512784 date "1990-01-09" @default.
- W83512784 modified "2023-09-27" @default.
- W83512784 title "Photochemical formation of carbon-centered radicals in natural waters" @default.
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