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M. L. CARVALHO, A. C. PIMENTEL, B. FERNANDES
2005 年 21 巻 7 号 p.
747-750
発行日: 2005年
公開日: 2005/11/18
ジャーナル
フリー
In this work we studied and compared the metal uptake in edible mushrooms (
Lepiota procera, Boletus badius, Boletus edulis, Tricholoma equestry, Lactarius deliciosus, Cantarelus tubalformis and
Cantarelus edulis), relative to sampling sites submitted to different pollution conditions: car traffic, soil pollution due to pesticides and fertilizers used in old vineyards, and incineration of hospital waste. Soil was also collected in some places, and its content was correlated to the corresponding one in some mushrooms species. All samples, without any chemical treatment, were analyzed by an X-ray fluorescence set-up. This technique is based on a monochromatic X-ray beam ionizing the atoms of the sample. Following this ionization, the emitted radiation is characteristic of the element, allowing its identification and quantification. Vineyards are normally submitted to very high amounts of sulfating, containing high copper concentrations. This metal is accumulated on the soil, and can be up-taken by vegetation. Very high levels of Fe and Cu were found in
Lepiota procera species in old vineyards. Zinc was found to be always higher than Cu by factors ranging from 1.5 to 8 in clean wood taken as a reference for the whole analyzed species, while in old vineyards the ratio Zn/Cu reach 0.25 for
Lepiota procera. This is correlated to the soil content for both elements. In addition, pollution induced by car traffic was checked in some samples, collected in the proximity of highways. Pb was the main contaminant in these areas, and presenting values 10 times higher than the corresponding ones in sites not submitted to pollution, for some species. Mushrooms contamination due to incineration of hospital waste was also studied, but we did not observe any contamination involving heavy metals in the several analyzed species around these areas. This is in agreement with what was expected, taking into account that hospital waste is mostly organic and, in principle, no heavy metals would be observed.
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Graciela CUSTO, Susana BOEYKENS, L. DAWIDOWSKI, L. FOX, D. GÓME ...
2005 年 21 巻 7 号 p.
751-756
発行日: 2005年
公開日: 2005/11/18
ジャーナル
フリー
This work describes a sampling strategy that will allow the use of portable EDXRF (energy dispersive X-ray fuorescence) instruments for “
in situ” soil analysis. The methodology covers a general approach to planning field investigations for any type of environmental studies and it was applied for a soil characterization study in the zone of Campana, Argentina, by evaluating data coming from an EDXRF spectrometer with a radioisotope excitation source. Simulating non-treated sampled as “
in situ” samples and a soil characterization for Campana area was intended. “
In situ” EDXRF methodology is a powerful analytical modality with the advantage of providing data immediately, allowing a fast general screening of the soil composition.
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M. K. TIWARI, S. R. NAIK, G. S. LODHA, R. V. NANDEDKAR
2005 年 21 巻 7 号 p.
757-762
発行日: 2005年
公開日: 2005/11/18
ジャーナル
フリー
Incident primary beam divergence is a source of systematic error in X-ray standing wave (XSW) characterization of single and multilayer thin films. Primary beam divergence significantly alters the XSW profile of a layered material and can lead to large errors when used with higher excitation energies. The present study suggests that when one uses Mo-
Kα excitation, the primary beam divergence should be in range of 0.005
0. On the other hand, in the case of Cu-
Kα excitation, primary beam divergence can be relaxed up to 0.01
0.
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Cristina VÁZQUEZ, Graciela CUSTO, Laura DAWIDOWSKI, Darí ...
2005 年 21 巻 7 号 p.
763-767
発行日: 2005年
公開日: 2005/11/18
ジャーナル
フリー
Multielemental composition and morphology of particulate matter samples were examined to detect the presence of two potential responsible pollutant emitters at four sites impacted during a pollution episode in the City of Campana, Argentina. Coke and smoke black are the main constituents associated to the industrial plants that were considered,
a priori, as responsible pollutant emitters. Wavelength dispersive X-ray fluorescence (WDXRF) was employed for the analysis of metals in samples coming from both, suspected sources and four sites. On the basis of multielemental composition profiles, a screening analysis was undertaken for exploring similarities among sources and sample sites adopting the average concentration profile of the crustal rock as soil surrogate. Particle morphology was studied by scanning electron microscopy (SEM) in source samples and in those environmental samples selected through the screening analysis. Two types of collected samples were analyzed: 1) those with composition profiles closer to the potential sources and 2) those closer to the cluster rock. This strategy was adequate to identify the responsible source of the contamination episode.
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Masaki TAKAOKA, Satoshi FUKUTANI, Takashi YAMAMOTO, Masato HORIUCHI, N ...
2005 年 21 巻 7 号 p.
769-773
発行日: 2005年
公開日: 2005/11/18
ジャーナル
フリー
Only limited information is available about the behavior of antimony (Sb) in contaminated soils. However, understanding the behavior of Sb in contaminated soils is important, because the toxicity or solubility of this element depends on its chemical state. In this study, we investigated the levels of Sb and the chemical forms of Sb in the soil around a smelter using X-ray absorption fine structure (XAFS) spectra. The highest Sb concentration in the contaminated soil was 2900 mg/kg dry soil. According to Sb-K edge X-ray absorption near edge (XANE) spectra, the Sb in the soil was in the form of Sb(V) compounds. The similarity of extended XAFS (EXAFS) spectra suggests that Sb speciation was independent of the sampling site, which indicates that Sb or Sb
2O
3 emitted from the smelter was converted into Sb(V) compounds in the soil.
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Shinichi SUZUKI, Yasuhiro SUZUKI, Hikoto OHTA, Masaaki KASAMATSU, Tosh ...
2005 年 21 巻 7 号 p.
775-778
発行日: 2005年
公開日: 2005/11/18
ジャーナル
フリー
Thirteen arsenous acid samples of known origins and refining methods were collected. Each sample was subjected to quantitative analysis of any impurity elements present using synchrotron radiation X-ray fluorescence spectrometry (SR-XRF) and inductively coupled plasma-atomic emission spectrometry (ICP-AES). The trace elements selected were Sn, Sb and Bi for the reasons that they were considered not to be changed by their circumstances and that they showed high sensitivity to SR-XRF. These results obtained by both methods were compared and the correlation between these two methods was determined. The quantification of trace impurities obtained by SR-XRF using As as an internal standard showed good agreement with the results obtained by ICP-AES. The discrimination of refining method became possible by the comparison of these impurities' contents measured with non-destructive SR-XRF using several arsenous acid particles.
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Junichi TSUJI, Manabu FUJITA, Yuichi HARUYAMA, Kazuhiro KANDA, Shinji ...
2005 年 21 巻 7 号 p.
779-781
発行日: 2005年
公開日: 2005/11/18
ジャーナル
フリー
The Li 1
s XPS (X-ray Photoelectron Spectroscopy) spectra of LiMn
2O
4, which is one of the major positive-electrode materials in lithium-ion rechargeable batteries, and MnO
2 as a reference material, were measured by a laboratory-type XPS spectrometer. The Li 1
s peak was not observed in the spectra excited by the Mg
Kα line (1253.6 eV), because the Li 1
s peak overlapped the background of the Mn 3
p peak of LiMn
2O
4. The photoionization cross section of Mn 3
p was larger than that of Li 1
s for Mg
Kα excitation. Therefore, the XPS measurement of LiMn
2O
4 by soft X-ray synchrotron excitation was carried out at beamline BL-7B on NewSUBARU synchrotron facility. Excitation energies of 110, 120, 130, 140, 150 and 151.4 eV were selected. The Li 1
s peak was clearly observed in these XPS spectra. In order to investigate the excitation energy dependence, the area ratio of the Li 1s and Mn 3
p peaks in the XPS spectra was plotted against the excitation energy. As a result, when the excitation energy was 110 eV, the area ratio had the maximum value.
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Hideshi ISHII, Jun KAWAI
2005 年 21 巻 7 号 p.
783-784
発行日: 2005年
公開日: 2005/11/18
ジャーナル
フリー
X-ray absorption spectral (XAS) analysis is performed with a combination of a 9 V dry electric battery X-ray generator and a portable Si PIN X-ray detector. The calcium K edge (4.0 keV) in paper is measured with a grazing incidence geometry, which suppressed the artifact due to the
Kα X-ray fluorescence peak at 3.5 keV. The 9 V dry battery X-ray emitter is useful for portable XAS measurements.
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Masaaki KASAMATSU, Yasuhiro SUZUKI, Toshio NAKANISHI, Osamu SHIMODA, Y ...
2005 年 21 巻 7 号 p.
785-787
発行日: 2005年
公開日: 2005/11/18
ジャーナル
フリー
Small particles of gold foil detached from an indoor decoration might be important evidence to associate a suspect with a crime scene. We have investigated the application of elemental analysis using synchrotron radiation X-ray fluorescence spectrometry to discriminate small particles of gold foil. Eight kinds of gold foil samples collected in Japan were used in the experiments. As a result of synchrotron radiation X-ray fluorescence spectrometry, only two elements, gold and silver, were detected from all gold foil samples. The intensity ratios of Ag
Kα/Au
Lα showed good correlation with the content ratios of Ag/Au. The variation of intensity ratio within a same sample was sufficiently small compared with those of different samples. Therefore the comparison of this intensity ratio can be an effective method to discriminate small particles originating from different types of gold foil.
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Hironori OHASHI, Hiroyuki EZOE, Yoshihiro OKAUE, Yasuhiro KOBAYASHI, S ...
2005 年 21 巻 7 号 p.
789-793
発行日: 2005年
公開日: 2005/11/18
ジャーナル
フリー
The effect of UV (ultraviolet) irradiation on the adsorption of Au(III) ions on manganese dioxide and their reduction to Au(0) (gold with 0 valence state) was investigated using XPS (X-ray photoelectron spectroscopy) and
197Au Mössbauer spectroscopy. The UV irradiation accelerated the adsorption and the reduction. From the fact that the proportion of Au(0) estimated from Au 4f XPS spectra for surface analysis was significantly smaller than that from
197Au Mössbauer spectra for bulk analysis, we deduced that Au(0) was interpenetrated to the inside of manganese dioxide (into deeper places than about 30 Å) where XPS is impossible to detect. The content of surface hydroxyl groups on manganese dioxide also increased due to the UV irradiation. The relationship between the charge in the content of hydroxyl groups and the interpenetration of Au(0) is discussed.
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Joëlle BLANC, Sébastien POPULAIRE, Loïc PERRING
2005 年 21 巻 7 号 p.
795-798
発行日: 2005年
公開日: 2005/11/18
ジャーナル
フリー
A simple method for the rapid identification of inorganic salts used as raw materials during food production has been established using energy dispersive X-ray fluorescence (EDXRF). Intensities of Na, Mg, P, S, Cl, K, Ca, Mn, Fe, Cu, Zn
Kα peaks have been measured. The treatment and comparison of the respective intensities allowed a rapid identification of inorganic salts. Two different methods of data treatment have been tested:
K nearest neighbours (KNN) and centroids. Using cross validation on a database containing 140 samples representing 31 classes, a total of 98% of samples were well identified.
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Kouichi TSUJI, Tetsuya EMOTO, Yosuke NISHIDA, Eiichiro TAMAKI, Yoshiku ...
2005 年 21 巻 7 号 p.
799-803
発行日: 2005年
公開日: 2005/11/18
ジャーナル
フリー
Grazing-exit x-ray fluorescence (GE-XRF) and micro x-ray fluorescence (μ-XRF) methods were applied to chemical microchips as a detection method. Since an energy-dispersive x-ray detector was used, the simultaneous detection of multiple elements was possible. An analyzing region was especially designed on the microchip so that a sample solution could be dried and concentrated in a suitable area corresponding to the size of the primary x-ray beam. Finally, it was confirmed that both analytical methods could be combined well for use with a microchip. In GE-XRF, the background intensity in the XRF spectrum was reduced at grazing-exit angles. In addition, a good relationship between the x-ray fluorescence intensities and the concentrations of standard solutions that were introduced into the microchip was obtained. This indicates that the GE-XRF method is feasible for trace elemental analysis in chemical microchip systems. In μ-XRF, an attempt was made to concentrate and dry the analyte within a small analyzing region. The preliminary results indicated that the μ-XRF method could be applied for the analysis of microchips.
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Shuji MATSUO, Nahomi SAKAGUCHI, Hisanobu WAKITA
2005 年 21 巻 7 号 p.
805-809
発行日: 2005年
公開日: 2005/11/18
ジャーナル
フリー
Titanium K-edge X-ray absorption near-edge structure (XANES) spectroscopy is used to examine the local Ti environments in the sol, gel, and xerogels of titanium oxide prepared by a sol-gel method. The xerogels were prepared by heat treatment at 200, 300, 400, 500, and 600°C (denoted xero-200, xero-300, xero-400, xero-500, and xero-600), and the xerogels were doped with Fe(II), Ni(II), and Cu(II) ions (xero-Fe, xero-Ni, and xero-Cu). The local structures of the samples are compared using the pre- and post-edge features of the XANES spectra. Further analysis of the pre-edge features using Gaussian functions provides the energy and height of each peak, and the intensity ratios between peaks. Based on the resulting data, the samples can be classified into three groups: a weak Ti-Ti interaction group, an anatase-like structure group, and an anatase group. The sol, gel, xerogel, and xero-Ni are in the weak Ti-Ti interaction group, and the xero-200, xero-Fe, and xero-Cu are in the anatase-like structure group. The remaining samples are in the anatase group.
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Pavel KARIMOV, Jun KAWAI, Ernst Z. KURMAEV
2005 年 21 巻 7 号 p.
811-813
発行日: 2005年
公開日: 2005/11/18
ジャーナル
フリー
A numerical simulation was done to check the possibility of using planar C/C/C multilayers with density contrast 0.2 and 0.7 g/cm
3 as an X-ray waveguide. After an optimization procedure, suitable waveguide layer thicknesses were found which provide a high degree of resonant standing wave field intensity enhancement in the core layer at incident beam energy of 13 keV. The obtained results were compared with those of the Mo/Be/Mo waveguide, whose high waveguiding capability at the same energy value was reported in the 1990s. The comparison shows that standing wave field intensity resonant enhancement provided by C/C/C planar multilayers is very high and, consequently, a guided beam can be well detected.
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Kenichi NAKAYAMA, Toshihiro NAKAMURA
2005 年 21 巻 7 号 p.
815-822
発行日: 2005年
公開日: 2005/11/18
ジャーナル
フリー
Major and trace elements (Na, Mg, Al, Si, P, K, Ca, Ti, Mn, Fe, Rb, Sr, Y, Zr, La, Ce, Pr, Nd, Sm, Gd, Dy, Th and U) in igneous rocks were assayed with fused lithium borate glass beads using X-ray fluorescence spectrometry. Low dilution glass beads, which had a 1:1 sample-to-flux ratio, were prepared for determination of rare earth elements. Complete vitrification of 1:1 mixture required heating twice at 1200°C with agitation. Extra pure reagents containing determinants were used for calibrating standards instead of the rock standard. The calibration curves of the 23 elements showed good linearity. Furthermore, the lower limits of detection corresponding to three times the standard deviation for blank measurements were 26 mass ppm for Na
2O, 6.7 for MgO, 4.5 for Al
2O
3, 4.5 for SiO
2, 18 for P
2O
5, 1.1 for K
2O, 4.0 for CaO, 3.9 for TiO
2, 1.6 for MnO, 0.8 for Fe
2O
3, 0.5 for Rb, 0.2 for Sr, 0.4 for Y, 0.5 for Zr, 3.3 for La, 6.5 for Ce, 2.7 for Pr, 2.1 for Nd, 1.7 for Sm, 0.7 for Gd, 2.7 for Dy, 0.5 for Th, and 0.6 for U. Using the present method, we determined the contents of these 23 elements in four rhyolitic and granitic rocks from Japan.
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Vasilios HATZISTAVROS, Pavlos KOULOURIDAKIS, Nikolaos KALLITHRAKAS-KON ...
2005 年 21 巻 7 号 p.
823-826
発行日: 2005年
公開日: 2005/11/18
ジャーナル
フリー
Selective membranes containing a few micrograms of various complexing reagents in a polyvinyl chloride (PVC) matrix were produced in order to determine low uranium concentrations in water. The membranes were produced on the surfaces of quartz glasses, and immersed in water solutions containing uranium salts (5 - 50 ng/mL). By the end of the equilibration time, the membranes were left to dry and analyzed based on the total reflection X-ray fluorescence. The effects of the complexing agents and their mass proportions added in the membranes were studied. The combination of the complexing reagents dithizone and thiourea gave the best result. The minimum detection limit was measured to be equal to 0.8 ng/mL.
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Masayasu KURAHASHI, Jun MIZUTANI, Akiharu HIOKI
2005 年 21 巻 7 号 p.
827-832
発行日: 2005年
公開日: 2005/11/18
ジャーナル
フリー
A new reliable analytical method, “Monochromatic X-ray Excitation X-ray Fluorescence Spectrometry”, has been proposed. For validating the method, trace elements in sediment certified reference materials were determined. In the method X-ray fluorescence spectra are measured for specimens and pure metals; in addition the mass-attenuation coefficients of the specimens for various X-ray wavelengths are also measured. The data are analyzed by the fundamental parameter method and the uncertainty of the analysis is evaluated. The obtained results were in satisfactory agreement with the certified values within their uncertainties. This method will be applicable to the certification of reference materials, in the field of which reliable results with uncertainty statements are required.
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S. THANGADURAI, J. T. ABRAHAM, A. K. SRIVASTAVA, M. NATARAJA MOORTHY, ...
2005 年 21 巻 7 号 p.
833-838
発行日: 2005年
公開日: 2005/11/18
ジャーナル
フリー
X-ray powder diffraction (XRD) data for eight
β-lactam
viz., ampicillin sodium, ampicillin trihydrate, penicillin G procaine, benzathine penicillin, benzyl penicillin sodium, cefalexin, cefotaxime sodium and ceftriaxone sodium; three tetracyclines
viz., doxycycline hydrochloride, oxytetracycline dihydrate and tetracycline hydrochloride; and two macrolide
viz., azithromycin and erythromycin estolate antibiotic drugs were obtained using a powder diffractometer. The drugs were scanned from Bragg angles (2
θ) of 10° to 70°. The obtained data were tabulated in terms of the lattice spacing (Å) and relative line intensities (
I/II). This new information may be useful for identifying these drugs from confiscated materials, which has been frequently encountered in forensic laboratories.
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Yoichi TANAKA, Yuji TANIGUCHI, Daisaku TANAKA, Masatoshi TOYODA, Hides ...
2005 年 21 巻 7 号 p.
839-843
発行日: 2005年
公開日: 2005/11/18
ジャーナル
フリー
The Kosa (yellow sand) aerosol affects the global environment as well as human health because it migrates from the interior of China to other areas, absorbing various atmospheric elements. Investigation into individual Kosa aerosol particles, which are submicroscopic to several tens of micrometers in diameter, is required to resolving the issue. We installed a scanning electron microscope (SEM) equipped with an energy dispersive X-ray spectrometer (EDX) on a synchrotron radiation (SR) beam line and introduced the SR beam into the SEM chamber for combinatorial application of SEM-EDX and SR X-ray fluorescence (SR-XRF) spectrometry to individual particles. It should be noted that detailed topographic observation by SEM and sensitive elemental analysis by SR-XRF, both crucial for individual particle measurement but which previously had to be carried out separately, were jointly performed inside the SEM chamber in this setup. Here, we show that SR-XRF results, in conjunction with SEM images, contributed toward resolving individual particle dispositions. Atmospheric sulfur primarily adheres to calcium in the aerosol particles and the particle surface roughens as a consequence of the chemical reaction between the two elements.
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David HELLIN, Annelies DELABIE, Riikka L. PUURUNEN, Peter BEAVEN, Thie ...
2005 年 21 巻 7 号 p.
845-850
発行日: 2005年
公開日: 2005/11/18
ジャーナル
フリー
In future microelectronic devices, SiO
2 as a gate dielectric material will be replaced by materials with a higher dielectric constant. One such candidate material is HfO
2. Thin layers are typically deposited from ligand-containing precursors in chemical vapor deposition (CVD) processes. In the atomic layer deposition (ALD) of HfO
2, these precursors are often HfCl
4 and H
2O. Obviously, the material properties of the deposited films will be affected by residual ligands from the precursors. In this paper, we evaluate the use of grazing incidence- and total reflection-X-ray fluorescence spectrometry (GI-XRF and TXRF) for Cl trace analysis in nanometer-thin HfO
2 films deposited using ALD. First, the results from different X-ray analysis approaches for the determination of Hf coverage are compared with the results from Rutherford backscattering spectrometry (RBS). Next, we discuss the selection of an appropriate X-ray excitation source for the analysis of traces within the high-
κlayers. Finally, we combine both in a study on the accuracy of Cl determinations in HfO
2 layers.
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Zi-Tao JIANG, Jimmy C. YU, Ho-Yan LIU
2005 年 21 巻 7 号 p.
851-854
発行日: 2005年
公開日: 2005/11/18
ジャーナル
フリー
A sensitive method for the preconcentration and determination of trace amounts of Co, Cu and Zn by energy-dispersive X-ray fluorescence spectrometry (EDXRF) has been developed. The method is based on the fact that 4-(2-pyridylazo)-resorcinol (PAR) loaded Dowex anion-exchange resin (PAR-resin) can effectively adsorb Co, Cu and Zn at pH 9.0 to form PAR-metal complexes. The detection limits for Co, Cu and Zn were 1.53, 0.31 and 0.21 ppb, respectively. The precisions for five replicate measurements of the three metals were 3.4, 2.7 and 2.1% RSD, and the calibration curves were linear up to 75 µg with correlation coefficients of 0.9975, 0.9980 and 0.9985, respectively. The method was successfully applied for the simultaneous determination of Co, Cu and Zn in seawater samples at ppb levels.
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Yasuhiro SUZUKI, Masaaki KASAMATSU, Shinichi SUZUKI, Toshio NAKANISHI, ...
2005 年 21 巻 7 号 p.
855-859
発行日: 2005年
公開日: 2005/11/18
ジャーナル
フリー
Measurements of the refractive index (RI) and elemental analysis using synchrotron radiation X-ray fluorescence spectrometry (SR-XRF) were applied to the forensic discrimination of sheet-glass samples from different origins. The refractive index was calculated from the matching temperature at which the glass fragments became invisible in silicone oil. Fragments smaller than 1 mm in maximum diameter were taken from each of 11 sheet glasses and subjected to analysis by SR-XRF. The XRF spectrum of these samples indicated that a comparison of 6 elements (Ca, Fe, Sr, Zr, Ba and Ce) was useful for the discrimination of sheet glasses. Cluster analysis was performed using 33 sets of SR-XRF data obtained by triplicate measurements for the 11 glasses. Comparing 528 pairs among 33 samples, 515 pairs could be correctly discriminated. The number of indistinguishable pairs could be reduced from 36 to 4 by comparing the SR-XRF data. Elemental analysis by SR-XRF could provide small glass fragments with a more evidential value than the solely measurement of only RI, through a significant improvement of the discrimination capability.
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Tokuzo KONISHI, Toshio TSUBATA, Masaoki OKU, Yanko M. TODOROV, Masaki ...
2005 年 21 巻 7 号 p.
861-864
発行日: 2005年
公開日: 2005/11/18
ジャーナル
フリー
High-resolution the Mn
Kα1 X-ray fluorescence spectra (HRXRF) were measured for a variety of manganese compounds, the oxidation number (valence) of which was from II to VII. Plots of the valence against the full width at half maximum (FWHM) and the chemical shift of the
Kα1 X-ray fluorescence spectra give a curve and a liniar relation, respectively. The coefficient of correlation (
R2) for the latter plot was 0.989 between valency II and VII. More excellent linearlity from III to IV was obtained with
R2 = 0.995, which enabled us to determine the oxidation number of manganese atom in a nickel ion doped spinel structure, LiMn
2O
4 (LiNi
xMn
2-xO
4, with 0.2 <
x < 0.42). From the valence of manganese ion obtained from HRXRF, the oxidation number of nickel ion is concluded to be divalent.
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Jun KAWAI, Michiharu OHTA, Tokuzo KONISHI
2005 年 21 巻 7 号 p.
865-868
発行日: 2005年
公開日: 2005/11/18
ジャーナル
フリー
The nickel
Kα spectra of oxides, halides (NiF
2, K
2NiF
6, NiCl
2, NiBr
2), complex compounds, and metal are measured with two different double-crystal X-ray fluorescence spectrometers. The peak shifts and line width changes due to the changes in the chemical states are reported. High reproducibility has been shown for the chemical shift and line width measurements. The DV-Xα molecular orbital calculation at the ground and the 1s
-1 hole states was performed to prove that the chemical effect originats from the charge-transfer mechanism.
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Wakako ARAKI, Kaoru MIZOROKI, Mitsuhiro OKI, Miyuki TAKENAKA
2005 年 21 巻 7 号 p.
869-872
発行日: 2005年
公開日: 2005/11/18
ジャーナル
フリー
The μ-EDXRF (energy dispersive X-ray fluorescence) method was applied to the screening of Pb in micrometer-area samples, such as a Cu contact in electrical components that had been coated by Pb-free Sn-Ag-Cu solder. The reliability of the screening method was evaluated by a comparison with a scanning electron microscope (SEM) observation and a precious chemical analysis method of inductively coupled plasma mass spectrometry (ICP-MS). Some factors that affect the testing reliability, such as the thickness of the solder, the segregation of Pb and Ag,
etc. were found by SEM observations. By adjusting some calculation parameters, screening of the micrometer area (0.1 mm) was performed using the fundamental parameter (FP) method for a thin film in conjunction with μ-EDXRF. The measurement error ranged by 25% for the thin film-FP method. The resulted detection limit was 0.04 wt% for Pb, depending on the solder thickness. This method can be successively applied for quality control to check the purity of a Pb-free Sn-Ag-Cu solder coating in electrical components.
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Hagen STOSNACH
2005 年 21 巻 7 号 p.
873-876
発行日: 2005年
公開日: 2005/11/18
ジャーナル
フリー
Total reflection X-ray fluorescence (TXRF) analysis is an established technique for trace-element analysis in various types of samples. Though expensive large-scale systems restricted the applications in the past, in this study the capability of a benchtop system for trace elemental analysis is reported. The suitability of this system for the mobile on-site analysis of heavy metal contaminated soils and sediments is reported as well as the possibilities and restrictions of TXRF for additional applications, including trace-element analysis of water, glass and biological samples.
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Nobuya INADA, Kuniko MAEDA, Jun KAWAI
2005 年 21 巻 7 号 p.
877-880
発行日: 2005年
公開日: 2005/11/18
ジャーナル
フリー
Terasawa reported strong X-ray emission from charged-up insulators, and proposed an X-ray production device only using the electrification. We constructed a similar device and studied the conditions of X-ray emission. It was shown that X-rays could be produced without supplying electrons from a filament.
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Hiroaki MURAKAMI, Ryoichi ONO, Atsuhiko HIRAI, Yoshinori HOSOKAWA, Jun ...
2005 年 21 巻 7 号 p.
881-884
発行日: 2005年
公開日: 2005/11/18
ジャーナル
フリー
A compact X-ray emission instrument is made, and the X-ray spectra are measured by changing the applied electric potential. Strong soft X-rays are observed when evacuating roughly and applying a high voltage to an insulator settled in this device. The X-ray intensity is higher as the applied voltage is increased. A light-emitting phenomenon is observed when this device emits X-rays. The present X-ray emitter is made of a small cylinder with a radius of 20 mm and a height of 50 mm. This X-ray generator has a potential to be used as an X-ray source in an X-ray fluorescence spectrometer.
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Ari IDE-EKTESSABI, MARIONA RABIONET
2005 年 21 巻 7 号 p.
885-892
発行日: 2005年
公開日: 2005/11/18
ジャーナル
フリー
The present paper focuses on the analysis of trace metallic elements and their role in neurodegenerative disorders. The use of synchrotron radiation microbeams allows investigation of pathological tissues from Alzheimer's disease, Parkinson's disease and Amyotrophic lateral sclerosis cases in a nondestructive manner and at cellular level. By employing X-ray absorption near edge structure (XANES) technique, the chemical state of the investigated elements can be determined, while energy-selective X-ray fluorescence spectroscopy provides the spatial distribution of each element in each oxidative state selectively. The investigated tissues (derived from human, monkey and mouse specimens) show distinct imbalances of metallic elements such as Zn and Cu as well as Fe
2+/Fe
3+ redox pair, which point to oxidative stress as a crucial factor in the development or progress of these neurodegenerative diseases.
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