X-ray Fluorescence Analysis of Rare Earth Elements in Rocks Using Low Dilution Glass Beads

Nakayama, Kenichi; Nakamura, Toshihiro

doi:10.2116/analsci.21.815

Cited by 58 publications

(47 citation statements)

References 11 publications

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“…Figure 7 shows the clustering dendrogram. Grouping the clusters at 15 of squared Euclidean distance, the dendrogram roughly reveals three main groups: Group 1 consists of 15 designed potteries (SMT1-4, 6,9,18,19,21,22,[25][26][27]32, and 41) and 17 undesigned potteries (SMT05, 07, 08, 10-13, 17, 20, 23, 24, 28, 29, 31, 33, 39, and 40); Group 2 consists of five undesigned potteries (SMT34-38); and Group 3 consists of four undesigned potteries (SMT14- 16 and 30). This classification has correlations with the PCA score plots ( Figure 5): Group 1, consists of groups C, D, and E of PCA; Group 2, equal to group B of PCA; and Group 3, equal to Group A of PCA.…”

Section: Cluster Analysismentioning

confidence: 99%

Provenance determination of prehistorical pottery from Oshima Island belonging to Izu islands (Tokyo, Japan) using X‐ray fluorescence spectrometry

et al. 2019

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A total of 41 pottery shards originating in the Jomon period (14000–300 BC) and Yayoi period (300 BC–250 AD) were excavated from the Shimotakabora site on Oshima Island of the Izu islands (Tokyo, Japan). X‐ray fluorescence spectrometry was used to determine the chemical composition (10 major oxides and 12 minor elements) of the potteries to identify the potteries' provenance, that is, local or nonlocal product. The calibration curves were drawn by synthetic standards prepared from a mixture of chemical reagents containing analytes, which presented good accuracy and reproducibility by analysis of the geochemical references. The pottery samples were classified by multivariate statistics such as principal component analysis and cluster analysis based on their chemical composition. Additionally, the X‐ray fluorescence results were compared with geochemical data from Oshima Island using scatter diagrams. The pottery provenance was identified by their classification. This provenance estimation indicates that 37 of the 41 potteries were brought to Oshima island from Japan's main island, Honshu, in the prehistoric age.

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Section: Cluster Analysismentioning

confidence: 99%

Provenance determination of prehistorical pottery from Oshima Island belonging to Izu islands (Tokyo, Japan) using X‐ray fluorescence spectrometry

et al. 2019

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“…Despite the smaller dilution factor, the borate mixture was successfully vitrified. In this study, a large bottom crucible having about 35 mm in diameter 8,9) was used, but smaller bottom crucible (for example, 12.5 mm in diameter 10) ) might be preferable to fuse 0.40 g of the flux. No precipitates were observed during the working solutions in preparation of high-speed steel and calibrating standards.…”

Section: Solution Preparationmentioning

confidence: 99%

Rapid Borate Fusion Pre-treatment for ICP-AES Determination of Tungsten in High-speed Steel

Nakayama

Wagatsuma

2016

ISIJ Int.

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This paper suggests a rapid decomposition and dissolution method for stable solution preparation in inductively coupled plasma atomic emission spectrometry when tungsten in a highspeed steel is quantified. The steel sample was decomposed with a mixture of hydrofluoric and nitric acid, and then the resulting solution was fused with lithium tetraborate. The vitrified borate was able to dissolve in nitric acid containing tartaric acid to prepare the final sample solutions. This pre-treatment method has a superior feature: borate could effectively prevent tungsten hydrolysis in the prepared solution. The standard for quantification could be prepared in a similar procedure using metal standard solutions. The present method enabled more rapid and accurate determination of tungsten in certified reference materials of high-speed steel compared to the conventional dissolution procedure.

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“…These reagents all exhibited particle sizes less than 10 μm, as reported elsewhere. 22) All reagents were dried under the appropriate conditions 23) using an electric furnace (FUM312PA; Toyo Seisakusho Kaisha, Ltd., Japan).…”

Section: Reagents For Standardsmentioning

confidence: 99%

Crystalline Phase Quantitation of Sintered Ore with Powder X-ray Diffractometry with Rietveld Refinement

et al. 2016

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X-ray diffractometry (XRD) with Rietveld refinement was applied to the crystalline phase analysis of two certified standard sintered ores (JSS 851-2 and JSS 851-5) and an industrial sintered ore (SO-1). An eskolaite (Cr 2 O 3 ) powder was mixed at 10 mass% with each sintered ore sample as an internal standard to correct for the effect of amorphous phase and unknown crystalline phases. The results of Rietveld refinement for JSS 851-2 were 23.0 mass% hematite, 29.5 mass% magnetite, 39.8 mass% silico ferrites of calcium and aluminum, 5.6 mass% dicalcium silicate, and 2 mass% amorphous phase, and these values are within the range previously reported for its phase composition. The elemental concentrations calculated from the crystalline compositions using Rietveld refinement of the three sintered ore samples were also in good agreement with the certified values and those from X-ray fluorescence analysis. A calibration curve method and a diffraction-absorption method for crystalline phase quantitation were used to validate the results of the powder XRD/Rietveld method, and the three results agreed well. The present method enables reliable determination of not only the major crystalline phases but also the amorphous phase present in the sintered ore.KEY WORDS: sintered ore; X-ray diffractometry; Rietveld refinement; internal standard.

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X-ray Fluorescence Analysis of Rare Earth Elements in Rocks Using Low Dilution Glass Beads

Cited by 58 publications

References 11 publications

Provenance determination of prehistorical pottery from Oshima Island belonging to Izu islands (Tokyo, Japan) using X‐ray fluorescence spectrometry

Provenance determination of prehistorical pottery from Oshima Island belonging to Izu islands (Tokyo, Japan) using X‐ray fluorescence spectrometry

Rapid Borate Fusion Pre-treatment for ICP-AES Determination of Tungsten in High-speed Steel

Crystalline Phase Quantitation of Sintered Ore with Powder X-ray Diffractometry with Rietveld Refinement

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