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USDA-ARS, North Central Soil Conservation Research Lab., 803 Iowa Ave., Morris, MN 56267
*Corresponding author (swagner{at}mail.mrsars.usda.gov).
ABSTRACT
Measurement of soil organic carbon (OC) is slow and expensive when inorganic carbon (IC) is present. Our objective was to develop an automated volumetric IC analysis system, thus allowing OC to be determined by difference. The system was developed by combining a pressure transducer with a personal computer (PC), data acquisition board, and appropriately developed software. The volumetric system was compared with combustion, neutralization, and sum of Ca + Mg techniques for samples containing up to 60 g kg–1 IC. Correlations between methods showed linear agreement (r2 
0.994). The volumetric system was more precise for relatively low IC amounts (2.0 g kg–1) and could process 20 samples h–1.
In cooperation with the Univ. of Minnesota Agric. Exp. Stn. Scientific Journal Series no. 971250017. All programs and services of the USDA are offered on a nondiscriminatory basis without regard to race, color, national origin, religion, sex, age, marital status or handicap.
Received for publication May 19, 1997.
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