Abstract
Measurement of dissolved organic radiocarbon (DO14C) in seawater can provide information about the timescale of the dynamics of dissolved organic matter and its sources in the ocean. Despite the development of accelerator mass spectrometry, the DO14C analysis requires complicated processing techniques such as the use of UV irradiation, which emits high heat. In this study, we developed a safer and easier method for analyzing DO14C in seawater than that used conventionally. A particularly significant change introduced by us was the adoption of a low-pressure mercury lamp in the decomposition system, which enabled direct decomposition of organic matter at lower temperatures. This method of decomposing dissolved organic matter in seawater may be applied not only for the analysis of 14C isotope ratio, but also for analyzing various other dissolved organic elements/isotopes.
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