Evaluation of quality parameters for the determination of total nitrogen in soils

Authors

  • Marco Antonio Lopez Choque Facultad de Agronomía, Universidad Mayor de San Andrés, Bolivia.
  • Miguel Angel Lopez Mamani Docente y Docente Investigador, Facultad de Agronomía, Universidad Mayor de San Andrés, Bolivia.
  • Elizabeth Yujra Ticona Investigadora, Facultad de Agronomía, Universidad Mayor de San Andrés, Bolivia. eytelizabethyujra@gmail.com

DOI:

https://doi.org/10.53287/tuov3244ge80j

Keywords:

total nitrogen, soils, Kjendahl, nitrogen validation, bolivian standard NB-ISO/IEC 17025:2017

Abstract

Nitrogen is an indispensable element for crop nutrition, but it is rarely found in sufficient quantities in the soil to satisfy crop needs; therefore, its adequate determination will establish the amount of nitrogen in the soil and the fertilization programs. The objective of this research work was to evaluate the quality parameters of the Kjeldahl method for the determination of total nitrogen in soils, thus establishing whether the method is suitable for this analysis. The determination of total nitrogen was based on the Kjendahl method, which basically has three stages: digestion, which consists of breaking all the nitrogen bonds in the soil sample and converting all the organically bound nitrogen into ammonium ions. The next stage is distillation where the ammonium ions are converted to ammonia by the addition of an alkali. The last stage is titration which consists of using boric acid as an absorbent solution. The variables were evaluated according to the different quality parameters of an analytical method according to international standard NB-ISO/IEC 17025:2017, these include linearity, limits of detection and quantification, accuracy, precision and uncertainty. The results obtained for total nitrogen, obtained in the laboratory of the Faculty of Agronomy comply with the quality parameters such as linearity, accuracy, precision, thus complying with the Bolivian standard NB-ISO/IEC 17025:2017.

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Published

2023-05-01

How to Cite

Lopez Choque, M. A., Lopez Mamani, M. A., & Yujra Ticona, E. (2023). Evaluation of quality parameters for the determination of total nitrogen in soils. Revista De Investigación E Innovación Agropecuaria Y De Recursos Naturales, 10(1), 37–43. https://doi.org/10.53287/tuov3244ge80j

Issue

Section

ARTÍCULOS ORIGINALES