A rapid X-ray fluorescence addition method has been developed for quantification of the technically most important metals in wood pulp matrix (Mn, Fe, and Cu). Pretreatment consisted of just two steps: first, acid was added to the sample to achieve homogeneous distribution of the metals; the pulp was then pressed lightly on to Mylar film. Total analysis time was less than 10 min. The concentration range investigated was up to 15 mg kg–1 for Mn and up to 5 mg kg–1 for Fe and Cu. Metal concentrations in Scandinavian pulps are not expected to exceed these amounts. The quantification limit was 2 mg kg–1 for all three metals. The reproducibilities and repeatabilities were concentration-dependent and varied between 3 and 19% and between 1 and 17%, respectively. The squares of the linear correlation coefficients between measured intensity and added metal concentration were 0.994, 0.950, and 0.932 for Mn, Fe, and Cu, respectively.
Rämö, J., Sillanpää, J., Klasila, T., & Piepponen, S. (2001). Determination of Mn, Fe, and Cu in chemically-treated wood pulps by the XRF addition method. Fresenius' Journal of Analytical Chemistry, 370(8), 1105-1108. https://doi.org/10.1007%2Fs002160100912