波長分散型蛍光X線分析装置による植物体化学組成分析の試み

概要

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A wavelength dispersive X-ray fluorescence spectrometer has been widely used for elemental analyses in the field of earth and soil sciences. In the present study, this instrument was applied to the quantitative analysis of some major (Mg, Ca, K, P, Al, Na) and minor elements (Mn, Fe, Ba, Cr, Cu, Ni, Pb, Sr, Zn) in vegetation specimens. Standard samples for calibration were prepared by mixing geochemical reference rock samples with some reagents. Samples were melted with lithium tetraborate to prepare glass bead. Vegetation samples (Chamaecyparis obtuse, Phragmites australis, litter and reference materials) were heated at 400℃ for 4 hours in advance. We used D (Deviation) value {(Measured value)-(Certified value)}/(Certified value)×100-to check the accuracy with certified reference vegetation materials, NIST1547 (Peach Leaves) and NIST1573a (Tomato Leaves). The D values of major elements except for Na, and those of minor elements such as Fe, Ba and Sr were within ±10%. The results of Ca and K were satisfactorily precise considering that their D values were within ±5%. The method proposed here can be reliably applied to analysis of vegetation species, and even complicated materials composed of litters and minerals in the soil horizon.
2011-07-10