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This article in SSSAJ

  1. Vol. 52 No. 4, p. 965-968
     
    Received: Aug 20, 1987
    Published: July, 1988


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doi:10.2136/sssaj1988.03615995005200040012x

Determination of Organic and Carbonate Carbon in Calcareous Soils Using Dry Combustion

  1. M. C. Rabenhorst 
  1. Department of Agronomy, H.J. Patterson Hall, Univ. of Maryland, College Park, MD 20742

Abstract

Abstract

A procedures is proposed which utilizes dry combustion and gravimetric determination of evolved CO2 for the determination of both organic and carbonate C in soil samples. A series of experiments was designed to determine the optimum temperature and duration of combustion that would be consistent with efficiency of analysis. Heating at 575 °C for 900 s using an O2 flow rate of 3.3 mL/s allows for determination of organic carbon (OC). Carbonate C from CaCO3 and dolomite is then determined by subsequently heating the same sample at 1000 °C for 600 s using the same O2 flow rate. This method gives quantitative recovery of organic and carbonate C from standard materials. Values for organic and carbonate C from 14 soil samples are in good agreement with existing procedures. The method is simple, requires a minimum of equipment, and has the benefit of using essentially the same procedure for both organic and carbonate C.

Contribution no. 7688 and Scientific Article no. A-4692 of the Maryland Agric. Exp. Stn. and the Dep. of Agronomy, Univ. of Maryland, College Park, MD 20742.

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