Published

2017-05-01

Organic acids to eliminate interference by phosphorus in the analysis of silicon by molecular absorption

Ácidos orgánicos para eliminación de interferencias por fósforo en el análisis de silicio por absorción molecular

Keywords:

Quantification, Phosphomolybdate, Extraction methods, Mineral nutrition, Silicomolybdate (en)
Cuantificación, Fosfomolibdato, Métodos de extracción, Nutrición mineral, Silicomolibdato (es)

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One of the problems for quantifying the amount of silicon available by molecular absorption is the elimination of chemical interference caused by available phosphorus. The aim of this work was to evaluate different organic acids in eliminating the interference caused by phosphorus in the quantification of available silicon by molecular absorption. The experiments were conducted in the Soil laboratory of the College of Agricultural Sciences at the Universidad de Córdoba, Colombia. For this work, different acids such as tartaric, citric, oxalic and malic were evaluated at two concentrations (0.8 and 1.33 mol L-1). Solutions containing silicon (1 mg L-1) and six concentrations of phosphorus were prepared (0.0, 0.2, 0.4, 0.6, 0.8 and 1.0 mg L-1). The quantification of silicon was conducted by molecular absorption spectrophotometry using a Perkin Elmer Lambda XLS + at 660 nm. The results were subjected to the LSD tests and contrasts using the R software (Development Core Team, version 3.2.2).The results indicated that the oxalic, citric and malic acids at both concentrations produced lower overestimation of silicon in the presence of the P concentrations 0.6, 0.8 and 1.0 mgL-1 than the tartaric acid, which is commonly used as a reference to remove the P interference.

Uno de los problemas para cuantificar la cantidad de silicio disponible por absorción molecular es la eliminación de la interferencia química causada por el P. El objetivo de este trabajo fue evaluar diferentes ácidos orgánicos para eliminar tal interferencia. Esta investigación fue realizada en el laboratorio de suelos y aguas de la Facultad de Ciencias Agrícolas de la Universidad de Córdoba, Colombia. Para el trabajo se evaluaron diferentes ácidos tales como tartárico (ácido de referencia), cítrico, oxálico y málico a dos concentraciones (0,8 y 1,33 mol L-1). Para tal fin soluciones con silicio (1 mg L-1) y seis concentraciones de P (0,0, 0,2, 0,4, 0,6, 0,8 y 1,0 mg L-1) fueron preparadas. La cuantificación del silicio se realizó por espectrofotometría de absorción molecular con un Perkin Elmer Lambda XLS+ a 660 nm. Los resultados fueron sometidos a la pruebas de DMS y contrastes utilizando el software R (Development Core Team, versión 3.2.2). Los ácidos orgánicos oxálico, cítrico y málico a ambas concentraciones presentaron menor sobreestimación de silicio a dosis de P 0,6, 0,8 y 1,0 mg L-1, que al ácido tartárico, el cual es utilizado como ácido de referencia para eliminar interferencias por P.

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References

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