Estudio comparativo entre fluorescencia de rayos X y reflectancia difusa de infrarrojos cercanos para la determinación de la retención en madera impregnada con arseniato de cobre cromatado

Abstract

RESUMENSe realizó un análisis comparativo de la precisión de los resultados en la determinación de la retención de óxidos de cobre, cromo y arsénico en madera impregnada con arseniato de cobre cromatado entre fluorescencia de rayos X y espectrometría de reflectancia difusa de infrarrojos cercanos. Los resultados de la calidad de las predicciones fueron comparados entre sí y con valores de retención obtenidos experimentalmente por método gravimétrico, absorción atómica y por cenizas resultantes de su calcinación. Los resultados del coeficiente de determinación del análisis de regresión entre la intensidad de fluorescencia de rayos X de las líneas K-Alpha y entre el espectro de reflectancia difusa de infrarrojos con respecto a la retención medida por métodos convencionales se encontraron en un rango de 0,909 a 0,986. Los resultados obtenidos pueden ser considerados aceptables para fines predictivos o incluso adecuados para propósitos de control de calidad. A su vez, al ser comparados por sus niveles de error de estimación, estos resultados fueron mejores que los obtenidos por otros estudios similares.Palabras clave: Absorción atómica, arseniato de cobre cromatado, fluorescencia de rayos X, madera impregnada, reflectancia difusa infrarroja. ABSTRACTThis paper evaluated the precision of predictions for chromated copper arsenate preservative retention in wood using X-ray fluorescence and near infrared diffuse reflectance. The quality of the predictions were compared with each other and with retention values obtained experimentally by gravimetric method, atomic absorption and total ash content. Coefficients of determination between the K-Alpha fluorescence intensities and near infrared diffuse reflectance with regard to conventional methods were between 0,909 and 0,986. The results can be considered acceptable for predictive purposes or even good for quality control purposes. In turn, the prediction errors were better than obtained by several studies.

Biofortification of Kidney Bean (Phaseolus vulgaris L.) Crops Applying Zinc Sulfate and Ferric Sulfate: Pilot Crop in Colombia

“…The spectral analysis of the X-rays re-emitted by fluorescence is the analytical technique that allows this equipment to obtain the characteristics of the different chemical elements in the sample. Thus, the analysis of the relative intensities for each sampling allows for concentrations of elements [26,27]. It should be noted that the equipment used to detect heavy metals, as well as essential and non-essential nutrients, detects them directly towards the plant sample due to the X-ray fluorescence it contains, and it is not necessary to prepare previous solutions to quantify some nutrients, since it is portable equipment and easy to use.…”

Analyses of Impregnation Quality and Mechanical Properties of Radiata Pine Wood Treated with Copper Nanoparticle- and Micronized-Copper-Based Wood Preservatives

“…The impregnation efficiency is determined by two indicators, one qualitative and the other quantitative, namely, penetration and retention, respectively [26,27]. After radiata pine wood impregnations, the retention by ED XRF values for the different preservative solutions were: K1, retention of 0.96 kg/m 3 and 421 kg/m 3 density; for K2, retention of 0.86 kg/m 3 and 415 kg/m 3 density; and for M, retention of 1.01 kg/m 3 with 418 kg/m 3 density, as shown in Figure 1.…”