Resumen

MAMANI QUISPE, Rolando; GUZMAN ALEGRIA, Leonardo; CHUNGARA CASTRO, Jorge  y  RAMOS RAMOS, Oswaldo E. Chemometric evaluation of the internal reference material (IRM) of agricultural soils in two provincial municipalities of La Paz  . Rev. Bol. Quim [online]. 2019, vol.36, n.4, pp.180-189. ISSN 0250-5460.

Abstract The purpose of the present work is to prepare, characterize and evaluate the physicochemical parameters of two soil samples to be used as internal reference material (MRI). The samples were collected in Yamora (Municipality of Inquisivi) and Viacha (Municipality of Viacha), dried at 100oC, ground, homogenized and quartered. The characterization was carried out by volumetry, potentiometry, conductimetry, UV-Visible spectrophotometry and Atomic Absorption spectrometry. According to the physical-chemical analysis, the soil of Yamora has a fertility suitable for all types of crops because it has a neutral pH, and high contents in P, % N, % MO and low CE. While the Viacha soil has a low natural fertility due to the strongly alkaline pH, high Na + contents and low P, % N and % MO contents. The tests and statistical evaluation of the internal reference materials MRI A (Yamora) and MRI B (Viacha) show homogeneity in all the parameters considered, except the pH in water. Regarding stability, it was subjected to an evaluation of phosphorus stability assimilable over time and according to statistical results it was shown that the stability of MRI B is high, however MRI A is slightly unstable. According to the results, the internal reference materials MRI A (Yamora) and MRI B (Viacha) meet the basic internal reference material requirements for the types of soil studied.

Palabras clave : Agricultural soils; Natural fertility; Homogeneity; Repeatability; Stability.

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