A precision UV-Wet chemical oxidation dissolved organic carbon analyzer
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This study is aimed at the development of a high-precision (sub- Molar) dissolved organic carbon (DOC) analyzer for aquatic samples. The prototype analyzer uses ultraviolet and wet chemical oxidation (UV-WCO) aided with heat to oxidize DOC contents in samples. The oxidized DOC in the form of CO2 is sparged from the solution at a defined flow rate and can be precisely determined through the use of a non-dispersive infrared (NDIR) gas analyzer. This prototype aims to improve on existing instruments by having sub-uM precision, near-continuous sample injection, and compatibility with analysis on board ships. It has potential applications for studies of DOC consumption and production by various mechanisms including but not limited to microbial respiration/carbon fixation, photochemical oxidation, and the mixing of water masses. The prototype was constructed and optimized to improve oxidation efficiency and precision. This prototype did not meet the sub-uM goal due to several factors affecting oxidation efficiency and signal stability. If the stability issues can be addressed and oxidation efficiency increased to 100% the desired precision could be achieved.