The Model 915 converted samples to carbon dioxide and used a non-dispersive infrared analyzer to determine the total carbon and inorganic carbon. Organic carbon was determined as the difference between those values.
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Photomation. “Beckman Model 915 Total Organic Carbon Analyzer with Infrared Analyzer and 10’ Recorder,” circa 1968. Beckman Historical Collection, Box 84. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/0z708w66h.
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