Simultaneous X-ray diffraction and X-ray fluorescence microanalysis on secondary xylem of Norway spruce
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Secondary xylem of Norway spruce was studied by X-ray microanalysis. Average dimensions of cellulose crystallites, fraction of oriented cellulose, mean microfibril angle, and nutrient element concentrations of K, Ca, Mn, and Zn were simultaneously determined using microfocused synchrotron radiation and a combination of X-ray diffraction and X-ray fluorescence spectroscopy techniques. The variation of these quantities in the microscopic size scale was noticeable, and similar between samples taken from the same annual ring. The mean microfibril angle and the nutrient concentrations of Ca, Mn, and Zn showed a correlation. The mean values of the structural parameters and their variation as a function of the annual ring were similar as reported in previous studies on Norway spruce.
The authors wish to thank the European Synchrotron Radiation Facility (ESRF) for allocating the necessary experiment time for our study. The Academy of Finland is gratefully acknowledged for supporting this work (Grant SA-1127759). K.P. thanks the Finnish National Graduate School in Nanoscience (NGS-NANO) for financial support.
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