Abstract
Infrared spectra of sodium and potassium alkaline-metal nitrates and magnesium and calcium alkali-earth nitrates in solid phase had been recorded in order to assign the fundamental bands. The influence of the dispersal medium (alkaline halide), employed in the solid sample preparation have been discussed. The quantitative measurements of the band in ten sities at 1387 cm -1 (present in the I.R. spectra of the four nitrates in KBr medium) allowed us to determine the Lambert-Beer law slopes for each compound. These values are differents (bearing in mind experimental random errors), so we have could to affirm the nonexistence of solid solution between the nitrate and the alkaline halide medium. The L-B law obtained by us can be used for the Identification differentiation and quantitative analysis of these nitrates in solid phase, even if they are present in a very low concentration.
Highlights
The identification and quantification of these salts have a basic interest at the time of diagnosing and subsequently repairing or restoring the monuments
The pellets for qualitative analysis were prepared adding 0.1-0.5 mg of nitrate to 300, 350 and 400 mg of KBr, CsBr and Csl respectively; the homogeneized mixture was placed in a 13 mm of diameter die, the pellet was subjected to a pressure of 9 free tons during 5 minutes, and a vacuum was maintained during 8 minutes (3 minutes before to compress)
The IR spectra obtained for the four nitratos in the different media are showed in the Figure 1
Summary
The identification and quantification of these salts have a basic interest at the time of diagnosing and subsequently repairing or restoring the monuments. Para realizar la identificación y el análisis, tanto cualitativo como cuantitativo, de los nitratos alcalinos y alcalinotérreos en fase sólida, deben obtenerse los espectros en condiciones óptimas de forma que sea posible la caracterización de los compuestos, la asignación de las bandas en base a su estructura y el establecimiento de relaciones cuantitativas con los parámetros que se miden (frecuencia e intensidad). In order to identify and analyze these nitrates in solid phase, both from qualitative and quantitative point of view, spectra must be obtained under optimum condition, doing possible the characterization and assignment of the bands (basing on their structure) as well as the establishment of quantitative relationships with the measured parameters (concentrations, frequencies and intensities). Así como la existencia o no de disolución sólida entre los nitratos alcalinos y alcalinotérreos y el haluro dispersante
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