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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Hesketh, Dean D. “Beckman Model 915 Total Organic Carbon Analyzer with Drawer Retracted,” circa 1968. Beckman Historical Collection, Box 84. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/b8515n57g.
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