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This 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. [ABSTRACT FROM AUTHOR]