Optimization of analytical conditions for major element analysis of geological samples with XRF using glass beads

Abstract

Ishizuka (2018) Optimization of analytical conditions for major element analysis of geological samples with XRF using glass beads. Bull. Geol. Surv. Japan, vol. 69 (2), p. 91-103, 4 figs, 6 tables. Abstract:The major element XRF analytical program, Bead03, has been prepared for geological samples. The analytical condition suitable for the samples was optimized considering sensitivity, precision, and the lower limit of detection. The detailed analytical protocol of Bead03 has been described, and Bead03 has been successfully used at the shared facility of the GSJ laboratory. Bead03 is generally used without the need for frequent calibration. As such, any user can perform analysis with a minimum number of steps and simple operation. Bead03 can also 1) perform overlapping correction of Br Lα on Al Kα, eliminating the effect of releasing agent LiBr, and 2) apply curve fitting of backgrounds for Na Kα and Mg Kα. The present report also describes the quality of calibration lines for silicate rock samples and analytical precision.

Preeruptive P‐T Conditions and H2O Concentration of the Aso‐4 Silicic End‐Member Magma Based on High‐Pressure Experiments

“…Sodium loss associated with migration during electron beam bombardment was reduced by using the defocused beam and also by determining Na concentrations within the first cycle using 10 s on-peak and 5 s on-background counting times. Whole-rock compositions were analyzed by Axios Advanced XRF using the method of Ogasawara et al (2018). Kaneko et al (2007).…”

Geochemical and geochronological constraints on the origin and emplacement of the Shimo‐ondori diorites in Shikoku, Southwest Japan

“…Then, the fused glass discs were prepared with a lithium tetraborate (Li 2 B 4 O 7 ) flux in a 1: 10 dilution ratio. The details of the analytical method are described in Ogasawara, Mikoshiba, et al (2018). The JB-1a (Quaternary basalt), a geochemical reference sample issued by the GSJ, was analyzed with unknown samples.…”

Determination of major elements in igneous rocks using microwave plasma atomic emission spectrometry (MP-AES)

“…Since the introduction of commercial ICP-MS spectrometers, and due to its high sensitivity, multielement capability, selectivity, and precision it has been chosen as the gold technique for the determination of trace and ultratrace elements in rock samples [2] , [3] , [4] , [5] , [6] , [7] . Despite the increased use of trace elements in geochemistry, major element determination continues to be essential and the most used techniques for its determinations are X-ray fluorescence (XRF) and inductively coupled plasma optical emission spectrometry (ICP OES) [8] , [9] , [10] , [11] .…”