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Carbon Determination in Soils and Organic Materials with A High-Frequency Induction Furnace¹

ABSTRACT

Application of established procedures for determination of carbon (C) in metals yielded about 60 to 90% C recovery from soils and pure organics. Systematic instrument and procedural changes showed that low recovery was due to escape of pyrolysis products or other volatile organic materials. Complete C recovery from dry soils and pure organics was achieved by adaptations employing an internal quartz-enclosed graphite ignitor or an external auxiliary resistance furnace. The procedures also permit analysis of total C in residues from soil extracts or other solutions and for inorganic C and organic C in soils.

¹ Contribution of the Soil and Water Conservation Research Division, ARS, USDA, in cooperation with the Oregon Agr. Exp. Sta. Technical Paper No. 1709, Ore. Agri. Exp. Sta. Supported in part by National Science Foundation Grant No. 13075.

² Research Chemist and Physical Science Technician, Northwest Branch, SWC, ARS, USDA, Corvallis, Ore.

Received for publication September 23, 1963. Accepted for publication December 6, 1963.