Ikuo Atsuya

Kitami Institute of Technology, Notsukeushi, Hokkaidō, Japan

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Publications (44)28.92 Total impact

  • [Show abstract] [Hide abstract]
    ABSTRACT: This work introduces the development of a novel determination method of trace nickel (ng l–1 level) in natural water samples. Nickel in the water samples is liquid–liquid extracted into methyl isobutyl ketone (MIBK) as nickel-diethyldithiocarbamate (DDTC) complex, and isotope dilution-oxygen added nitrogen-microwave induced plasma mass spectrometry (ID-oxygen added nitrogen-MIP-MS) is conducted by direct measurement of the liquid–liquid extracted organic MIBK phase. The accuracy of the proposed method was confirmed by analysing certified reference materials (NRC NASS-5 seawater, NRC SLRS-3 riverine water and NRC SLRS-4 river water), and the analytical results obtained were in good agreement with the certified values. The detection limit for nickel is 1.3 ng l−1 when the water sample is 50 times concentrated. The precision as RSD is <4%. The proposed method was applied to clarify the concentration-depth vertical profiles of nickel in Lake Mashu, Japan, as the Baseline Station of the United Nations GEMS/Water (Global Environment Monitoring System/Water) Programme.
    International Journal of Environmental Analytical Chemistry 08/2011; 91(9):811-820. · 1.24 Impact Factor
  • Bunseki kagaku 01/2009; 58(8):771-775. · 0.33 Impact Factor
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    ABSTRACT: Determination of selenium in certified reference biological materials by slurry sampling electrothermal vaporization (ETV)-isotope dilution (ID)-microwave-induced nitrogen plasma mass spectrometry (MIP-MS) was performed. Several parameters such as the heating conditions were studied in order to obtain optimal conditions. A special heating stage called the in situ fusion stage was applied just before the pyrolysis stage in the electrothermal vaporization process in order to fuse the biological sample and to achieve selenium isotope-equilibration between selenium in the sample and the 78Se spike solution. The slurry sample containing an appropriate amount of biological sample, 78Se spike solution, and sodium hydroxide as an alkaline flux was injected into the electrothermal vaporization unit. The slurry sample was in situ fused, pyrolyzed, and then vaporized. The ion counts at m/z=78 and 80, the spike and reference isotopes, respectively, could be measured accurately without interference caused by argon since nitrogen plasma was used. The analytical utility of the proposed slurry sampling-electrothermal vaporization-in situ fusion-microwave-induced nitrogen plasma mass spectrometry was evaluated by determining the selenium concentration in certified reference biological materials, and the analytical results obtained were in good agreement with the certified values. The limit of detection for selenium was 90 ng g−1. The relative standard deviation of the determination of selenium was 8–15% with a high sample throughput (less than 30 min per sample including a slurry preparation.)
    Spectrochimica Acta Part B Atomic Spectroscopy 01/2005; 60(3):327-331. · 3.14 Impact Factor
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    ABSTRACT: A fast and accurate analytical method was established for the simultaneous direct determination of aluminum, calcium and iron in silicon carbide and silicon nitride powders by graphite furnace atomic absorption spectrometry using a slurry sampling technique and a Hitachi Model Z-9000 atomic absorption spectrometer. The slurry samples were prepared by the ultrasonication of silicon carbide or silicon nitride powders with 0.1 M nitric acid. Calibration curves were prepared by using a mixed standard solution containing aluminum, calcium, iron and 0.1 M nitric acid. The analytical results of the proposed method for aluminum, calcium and iron in silicon carbide and silicon nitride reference materials were in good agreement with the reference values. The detection limits for aluminum, calcium and iron were 0.6 microg/g, 0.15 microg/g and 2.5 microg/g, respectively, in solid samples, when 200 mg of powdered samples were suspended in 20 ml of 0.1 M nitric acid and a 10 microl portion of the slurry sample was then measured. The relative standard deviation of the determination of aluminum, calcium and iron was 5 - 33%.
    Analytical Sciences 04/2004; 20(3):455-9. · 1.57 Impact Factor
  • Q Zhang, H Minami, S Inoue, I Atsuya
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    ABSTRACT: A sensitive and accurate method for the differential determination of trace amounts of arsenic(III) and arsenic(V) in water samples was described. It was found that arsenic(III) was coprecipitated quantitatively with a Ni–ammonium pyrrolidine dithiocarbamate (APDC) complex at the pH range of 2–3, but arsenic(V) was hardly coprecipitated with the Ni–PDC complex in the same pH condition. The coprecipitates obtained were directly measured by electrothermal atomic absorption spectrometry (ETAAS) using the solid sampling technique. In order to determine trace amounts of total arsenic, sodium thiosulfate and potassium iodide were used to reduce arsenic(V) to the trivalent state in the sample solution before coprecipitation. The concentration of arsenic(V) in the sample solution could be calculated by the difference in concentration between arsenic(III) and total arsenic in the sample solution. The coprecipitation conditions for trace amounts of arsenic(III) and arsenic(V) in water samples by the Ni–PDC complex were investigated in detail. The concentration factor by coprecipitation was reached at about 40 000 when 2 mg of nickel as a carrier element was added to 500 ml of the water sample. The proposed method was successfully applied to the determination of trace amounts of arsenic(III) and arsenic(V) in seawater, and the detection limit for arsenic, which was defined as the concentration calculated from three times of the standard deviation of the procedural blanks, was 0.02 ng/ml for 500 ml portions of water sample in the proposed method.
    Analytica Chimica Acta. 01/2004;
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    ABSTRACT: Isotope dilution analysis of the sub-microg l(-1) levels of selenite and selenate in natural water samples by microwave-induced nitrogen plasma mass spectrometry (MIP-MS) was performed. An appropriate amount of a spike solution containing 78Se-selenite and 78Se-selenate was added to the natural water sample to be analyzed. Both analytes in the water were then concentrated simultaneously by passing the sample through a column that was filled with an anionic exchange resin. After the concentration process, all of the selenite and some of the selenate on the resin were eluted by 0.03 M nitric acid. The residual selenate was eluted by 0.13 M nitric acid. The eluted sample solutions were injected into MIP-MS, and isotope dilution analyses were carried out. Selenite and selenate concentrations as low as 0.01 microg l(-1) in the natural water sample were successfully determined by the proposed method.
    Analytical Sciences 11/2003; 19(10):1359-63. · 1.57 Impact Factor
  • Kunihiko Akatsuka, Ikuo Atsuya
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    ABSTRACT: A reference material for the direct analysis of solid samples by electrothermal atomic absorption spectrometry (EAAS) was prepared by coprecipitation of eight metal ions with magnesium(II) 8-quinolinate. The metal ions were quantitatively recovered and the distribution of the metal ions in the reference material was confirmed to be homogeneous. The reference material was more than adequate for multielemental analysis of biological samples by EAAS. For the analysis, an inner miniature cup, which was placed into a cupper-type graphite furnace, was also used. Analyses were conducted without any pretreatment of samples. The accuracy, precision, and limits of detection of the method are described. The accuracies of solid samples on a routine basis. The limits of detection for Al, Cd, Co, Cu, Mn, Ni, Pb, and Zn in solids are 0.087, 0.008, 0.012, 0.05, 0.003, 0.043, 0.14, and 0.013 ..mu..g/g, respectively.
    Analytical Chemistry - ANAL CHEM. 04/2002; 61(3).
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    ABSTRACT: A direct method for determination of silicon in powdered high-purity aluminium oxide samples, by slurry sampling with in situ fusion graphite-furnace atomic-absorption spectrometry (GF-AAS), has been established. A slurry sample was prepared by 10-min ultrasonication of a powdered sample in an aqueous solution containing both sodium carbonate and boric acid as a mixed flux. An appropriate portion of the slurry was introduced into a pyrolytic graphite furnace equipped with a platform. Silicon compounds to be determined and aluminium oxide were fused by the in situ fusion process with the flux in the furnace under optimized heating conditions, and the silicon absorbance was then measured directly. The calibration curve was prepared by use of a silicon standard solution containing the same concentration of the flux as the slurry sample. The accuracy of the proposed method was confirmed by analysis of certified reference materials. The proposed method gave statistically accurate values at the 95% confidence level. The detection limit was 3.3 microg g(-1) in solid samples, when 300 mg/20 mL slurry was prepared and a 10 microL portion of the slurry was measured. The precision of the determination (RSD for more than four separate determinations) was 14% and 2%, respectively, for levels of 10 and 100 microg g(-1) silicon in aluminium oxide.
    Fresenius Journal of Analytical Chemistry 09/2001; 370(7):855-9.
  • Q Zhang, H Minami, S Imoue, I Atsuya
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    ABSTRACT: A method for the determination of trace amounts of arsenic and tin in natural waters is described. Trace amounts of arsenic and tin were preconcentrated by coprecipitation with a Ni-ammonium pyrrolidine dithiocarbamate (APDC) complex. The coprecipitates obtained were directly analyzed by graphite-furnace atomic-absorption spectrometry (GFAAS) using the Ni-APDC complex solid-sampling technique. The coprecipitation conditions used for the trace amounts of arsenic and tin in natural water were investigated in detail. It was found that arsenic and tin at sub-ng mL(-1) levels were both coprecipitated quantitatively by Ni(PDC)2 in the pH range 2-3. The concentration factors by coprecipitation reached approximately 40,000 when 2 mg nickel was added as a carrier element to 500 mL of the water sample. The proposed method has been applied to the determination of trace amounts of arsenic and tin in river water and seawater reference materials, and the detection limits for arsenic and tin, which were calculated from three times of the standard deviation of the procedural blanks, are 0.02 ng mL(-1) and 0.04 ng mL(-1), respectively, for 500-mL volumes of water sample.
    Fresenius Journal of Analytical Chemistry 09/2001; 370(7):860-4.
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    ABSTRACT: A sensitive and accurate method for the determination of ultra-trace amounts of cobalt in seawater is described. Ultra-trace amounts of cobalt were pre-concentrated by co-precipitation with a combination of 8-quinolinol and nickel as a carrier element and 1-nitroso-2-naphtol as an auxiliary complexing agent. The co-precipitates obtained were directly measured by graphite furnace atomic absorption spectrometry using the solid-sampling technique. The co-precipitation conditions for ultra-trace amounts of cobalt with Ni/8-quinolinol/1-nitroso-2-naphtol complex were investigated in detail. It was found that ultra-trace amounts of cobalt are co-precipitated quantitatively with Ni/8-quinolinol/1-nitroso-2-naphtol complex in the pH range of 5.5–8.5. The concentration factor by the co-precipitation reached about 33,000-fold for 1000ml of the aqueous sample. The proposed method has been successfully applied to the determination of ultra-trace amounts of cobalt in seawater, and the detection limit for cobalt which was defined as the concentration calculated from three times of the standard deviation of the procedural blanks, is 1ng/l for 1000ml portions of seawater samples.
    Analytica Chimica Acta 01/2000; 407(1):147-153. · 4.39 Impact Factor
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    ABSTRACT: A sensitive and accurate method for the determination of chromium at the ultra-trace levels has been investigated and applied to river water and seawater. Chromium was pre-concentrated by coprecipitation with a combination of 8-quinolinol, palladium as a carrier element and tannic acid as an auxiliary complexing agent, and the coprecipitates obtained were directly measured by graphite furnace atomic absorption spectrometry (GFAAS) using the solid sampling technique. The coprecipitation conditions for chromium with Pd/8-quinolinol/tannic acid complex, such as the effects of the pH, amounts of palladium and tannic acid, were examined in detail. It was found that chromium is coprecipitated quantitatively with Pd/8-quinolinol/tannic acid complex in the pH range of 5.1–5.3. The detection limit for chromium, which was defined as the concentration calculated from three times of the standard deviation of the procedural blanks, is 20 ng/l for 300 ml portions of water samples in the proposed method.
    Analytica Chimica Acta 01/1999; · 4.39 Impact Factor
  • Source
    Analytical Sciences - ANAL SCI. 01/1997; 13(2):199-203.
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    ABSTRACT: A new solid-liquid extraction sampling technique with graphite furnace atomic absorption spectrometry is based on the quantitative extraction of the element of interest from the biological powdered samples into a liquid phase of 1 mol 1−1 nitric acid solution. Examinations of the conditions for sample preparation using solid-liquid extraction (i.e. the effect of concentration of nitric acid, sample mass and ultrasonication time on the extraction) have been carried out in order to obtain 100% extraction of cadmium, copper, lead and manganese from powdered biological samples to the liquid phase. 100% of extraction of these metals is successfully carried out using 1 mol 1−1 nitric acid, and separation of solid phase and liquid phase is done by using a centrifuge (20 min, 4000 rev min−1). The proposed method is applied to the determination of cadmium and lead at 0.1 μ g−1 levels and of copper and manganese at 10 μ g−1 levels in powdered biological samples. These analytical results are ascertained by microwave induced nitrogen plasma-mass spectrometry.Detection limits for cadmium, copper, lead and manganese are, respectively, 0.012 μ g−1, 0.829 μ g−1, 0.082 μ g−1 and 0.125 μ g−1 in solid samples, when 50 mg of powdered biological samples is extracted in 5 ml of 1 mol 1−1 nitric acid and then 10 μ l of extracted solution is measured. Precisions of the determination (relative standard deviation at five determinations) of cadmium, copper, lead and manganese are 3.4%, 3.1%, 3.9% and 3.1%, respectively.
    Spectrochimica Acta Part B Atomic Spectroscopy 01/1996; · 3.14 Impact Factor
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    ABSTRACT: A new method of preparing calibration graphs (three-point estimation-standard addition method) is Proposed for the direct determination of chromium at parts per million or sub-parts per million in powdered biological samples by graphite furnace-atomic absorption spectrometry with a solid-sampling technique using a graphite miniature cup. Accurate analytical results for the direct determination of chromium have been obtained by the proposed method, and it was found that the calibration graph prepared by one sample has since been successfully applied to other kinds of biological samples. The analytical results by the proposed method are compared with the analytical results obtained by a conventional calibration curve prepared by using a chromium standard solution and the standard addition method for solid samples proposed by Eames and Matousek (Anal. Chem., 1980, 52, 1248-1251).
    Microchemical Journal 01/1994; 49:126-135. · 2.88 Impact Factor
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    ABSTRACT: A pre-ashing method by a conventional electrothermal furnace was used as a concentration technique for powdered biological samples in the solid sampling technique with GF-ZAAS. A relationship equation between the concentration factors and the concentrations of main inorganic components in biological samples has been established, and it has become possible to calculate the concentration factors, if the total concentration of K, Na, Mg and Ca, or total concentration of K and Mg, or the concentration of K only are known. The proposed method has been successfully applied to the direct determination of Co, Ni, Mn and Pb at the g/kg levels in biological samples.
    Fresenius Journal of Analytical Chemistry 01/1993; 346(12):1054-1057.
  • Analytical Sciences - ANAL SCI. 01/1992; 8(3):433-436.
  • Spectrochimica Acta Part B-atomic Spectroscopy - SPECTROCHIM ACTA PT B-AT SPEC. 01/1991; 46(1):103-108.
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    ABSTRACT: The selection of standard materials for the establishment of calibration curves is one of the most important problems in the direct analysis of biological samples by GFAAS. Three kinds of standard materials, NBS tomato leaves, coprecipitates with magnesium oxinate and Ni/DMG/PAN were investigated. It was found that it is possible to use both the NBS-SRM and the synthetic reference material prepared by coprecipitation with magnesium oxinate as standard materials for the direct determination of copper in several biological samples issued from NBS and NIES. However, too low results are obtained when the synthetic reference material prepared by coprecipitation with Ni/DMG/PAN is used. In order to clarify this, the effects of nickel and magnesium were examined and the role of magnesium was discussed.
    Fresenius Journal of Analytical Chemistry 12/1989; 337(3):294-298.
  • Analytical Sciences - ANAL SCI. 01/1989; 5(4):475-479.
  • Kunihiko Akatsuka, Ikuo Atsuya
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    ABSTRACT: An investigation has been carried out to establish a rapid method for the determination of vitamin B12 as cobalt in solid pharmaceutical samples by electrothermal atomization atomic absorption spectrometry with the solid sampling technique using an inner miniature cup. Calibration graphs of peak area versus mass of the element were constructed by use of a synthetic reference material (SyRM). The SyRM is prepared by coprecipitation of cobalt ions with magnesium(II) 8-quinolinate. In order to determine the accuracy of the proposed method, three pharmaceutical preparations were analyzed according to the proposed method using standardization against the SyRM and the results obtained compared with those when solutions of the same samples were analyzed by other techniques. There is good agreement between the results obtained from the proposed and the other method. The detection limit for cobalt in a solid pharmaceutical preparation is 0.15 ng/mg (i.e. 4 ng/mg of vitamin B12) for a typical sample mass of 1.0 mg.
    Fresenius Journal of Analytical Chemistry 12/1988; 335(2):200-204.