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Published online 2 June 2005
Published in Soil Sci Soc Am J 69:1066-1068 (2005)
DOI: 10.2136/sssaj2004.0010
© 2005 Soil Science Society of America
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A SIMPLE METHOD FOR MEASURING THE CARBONATE CONTENT OF SOILS

Balázs Horvátha,*, Oliver Opara-Nadib and Friedrich Beesea

a Inst. of Soil Sciences and Plant Nutrition, Georg-August Univ. of Göttingen, 2 Büsgenweg, Göttingen, 37077 F.R. Germany
b Faculty of Agriculture & Veterinary Medicine, Abia State Univ., P.M.B. 2000 Uturu, Nigeria



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  		Fig. 1. (a) A diagram of the carbonate content measuring apparatus. 1, Test tube; 2, septum (enlarged: laminated structure; a silicon layer between two rubber layers); 3, screw cap (enlarged top view: hole in the middle); 4, plastic container, with 3.5 M HCl; 5, sample. (b) The carbonate content measuring apparatus after mixing the sample and the HCl. 1, Mixture of sample and the acid; 2, developing CO2; 3, pressure sensor; 4, digital manometer (888 represents the displayed pressure).

 


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  		Fig. 2. Comparison of the measured (msd.) and added values by different amounts of CaCO3. The equation of the fitted line is y = 0.9986x, r2 = 0.9992, and n = 12.

 


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  		Fig. 3. Calibration lines for different soil carbonate contents. Sample size is 0.50 g. For the explanation of enlarged sample and reduced sample, see Table 2.

 




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