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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Karjalas' Photo Vision. “Beckman Model 915-B Tocamaster Total Organic Carbon Computational System,” circa 1968. Beckman Historical Collection, Box 79. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/44558d45t.
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