Titratable Acidity at pH = 7 Estimated from the pH of a Soil:Buffer Mixture

Authors

  • Andrés Nicolás Beretta Laboratorio de Suelos,Plantas y Aguas de INIALa Estanzuela. Ruta 50 km 10 y medio. Departamento de Colonia, Uruguay
  • Daniel Bassahun Laboratorio de Suelos,Plantas y Aguas de INIALa Estanzuela. Ruta 50 km 10 y medio. Departamento de Colonia, Uruguay
  • Deborah Torres Laboratorio de Suelos,Plantas y Aguas de INIALa Estanzuela. Ruta 50 km 10 y medio. Departamento de Colonia, Uruguay
  • Raquel Musselli Laboratorio de Suelos,Plantas y Aguas de INIALa Estanzuela. Ruta 50 km 10 y medio. Departamento de Colonia, Uruguay
  • Leticia García Laboratorio de Suelos,Plantas y Aguas de INIALa Estanzuela. Ruta 50 km 10 y medio. Departamento de Colonia, Uruguay

DOI:

https://doi.org/10.31285/AGRO.21.1.12

Keywords:

saturated soil, desaturated soil, cation exchange capacity, base saturation, potential acidity

Abstract

The value of titratable acidity in soil pH = 7 (AT_pH7) is used for taxonomic purposes and to estimate lime requirement. AT_pH7 could be predicted by the pH value of the mixture soil:buffer solution (pH_equilibrium). Calcium acetate buffered at pH = 7 was added to each sample and pH_equlibrium and alkali required to reach pH = 7 were measured. With pH_equilibrium the AT_pH7 was estimated by regression (AT_eq) and by the amount of alkali neutralized to achieve pH_equilibrium (AT_OH). There was an acceptable fit between AT_pH7, AT_eq and AT_OH, but their differences were not normally distributed. Both, AT_OH and AT_eq, underestimated the AT_pH7 average. The pH_equilibrium value was more accurate than AT_pH7, while AT_eq and AT_OH measurements were less accurate. The use of AT_OH and AT_eq did not introduce significant errors in classifying the soils by their saturation in bases. Both measurements wereperformed in a shortertime than AT_pH7.

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Published

2017-06-01

How to Cite

1.
Beretta AN, Bassahun D, Torres D, Musselli R, García L. Titratable Acidity at pH = 7 Estimated from the pH of a Soil:Buffer Mixture. Agrocienc Urug [Internet]. 2017 Jun. 1 [cited 2024 Jun. 15];21(1):105-8. Available from: https://agrocienciauruguay.uy/index.php/agrociencia/article/view/181

Issue

Section

Natural and environmental resources
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