A5079153760- Analytical chemistry methods development
- Heavy metals in environment
- Geochemistry and Elemental Analysis
- Radioactive element chemistry and processing
- Mercury impact and mitigation studies
- Electrochemical Analysis and Applications
- Analytical Chemistry and Sensors
- Extraction and Separation Processes
- Water Quality and Pollution Assessment
- Analytical Chemistry and Chromatography
- Semiconductor Lasers and Optical Devices
- Advanced Chemical Sensor Technologies
- Radioactivity and Radon Measurements
- X-ray Spectroscopy and Fluorescence Analysis
- Chemical Analysis and Environmental Impact
- Semiconductor Quantum Structures and Devices
- Water Quality Monitoring and Analysis
- Geochemistry and Geologic Mapping
- Magnetic properties of thin films
- Atmospheric chemistry and aerosols
- Microfluidic and Capillary Electrophoresis Applications
- Heavy Metals in Plants
- Phase-change materials and chalcogenides
- Photonic and Optical Devices
- Magneto-Optical Properties and Applications
Azabu University
2014-2025
Hanover College
2018
University of the Ryukyus
2010-2014
University of the Ryukyus University Hospital
2006-2012
Meguro Parasitological Museum
2010
Kyoto University
2010
Kasumigaura Medical Center
2010
Nagoya University
1996-2005
Ricoh (Japan)
2002-2003
Nihon University
1985-2002
ABSTRACT In this study, we investigated accurate quantitative analysis of trace elements (Cr, Fe Co, Cu, Zn, Br, and Pb) in microplastics using a transportable x‐ray fluorescence (XRF) spectrometer. The correction XRF intensity analyte was performed by the proposed equations prepared polyester calibration standards for sample thickness size. method effective microplastic samples, but analytical errors were larger samples 2 mm diameter. effect matrix effects due to composition analyzing...
Abstract Coastal seawater and river water samples were collected near Nagoya port, located in the coastal area of Ise Bay, six rivers around City. The rare earth elements (REEs) these determined by inductively coupled plasma mass spectrometry (ICP-MS) with chelating resin preconcentration. concentrations all REEs except for Pm could be at concentration level from sub-ng L−1 to 10 ng L−1. In order examine relative variations, REE patterns estimated normalizing those Post Archean Average...
Abstract Rare earth elements in coastal seawater were preconcentrated by using chelating resin a batch method and determined simultaneously inductively coupled plasma mass spectrometry (ICP-MS). In this procedure, matrix components (Na, K, Mg, Ca) eliminated to reduce effects ICP-MS analysis rare concentrated concentration factor of 100. The pH dependence the recovery, amounts, amount ammonium acetate for washing, elution adsorbed metals with nitric acid examined details optimize...
Abstract The multielement determination of trace elements in coastal seawater by inductively coupled plasma mass spectrometry has been investigated with the aid chelating resin preconcentration. First, each sample (250 ml) was treated a (Chelex 100) at pH 6 for preconcentration elements. After filtration glass filter, on filter carefully rinsed 8 ml 1 M ammonium acetate solution. Then, adsorbed were eluted 2 HNO3. As result, factor 41.7 fold obtained, total concentration matrix (Na, K, Mg,...
Abstract A chelating resin-packed minicolumn was developed to pretreat seawater samples for the determination of trace metals by inductively coupled plasma mass spectrometry (ICP-MS). The preconcentration conditions, such as flow rate sample loading, pH adsorption, amount ammonium acetate eliminating matrix elements, and nitric acid eluting from resin, were investigated optimized. Firstly, 50 mL adjusted 6.0 loaded into column at 3 min−1. Secondly, 8 1 M 5 pure water passed through Mg Ca....
A combined system of size exclusion chromatography, UV absorption detection and ICP-MS was used for elucidation the dissolved states yttrium lanthanide elements in lake water collected from Lake Biwa, Japan. The samples were filtered with a membrane filter (pore 0.45 µm) just after filtration glass 1.0 µm). total concentrations filtrate determined by chelating resin preconcentration. For speciation analysis, above further preconcentrated 30–500-fold an ultrafiltration filter, which allowed...
An automatic column changing system was developed for preconcentration and measurement of rare earth elements (REEs) in natural water samples, where syringe driven chelating columns (SDCCs) were applied to the hybrid (off-line operation on-line operation) solid phase extraction REEs. The sample loading carried out off-line prior measurement. After that, SDCCs set into holder REEs eluted measured by an inductively coupled plasma mass spectrometer (ICP-MS). present permitted continuously 30...
Despite advances in endoscopic procedures and extracorporeal shock wave lithotripsy (ESWL), the removal of impacted pancreatic duct stones demands a certain amount time. The aim this study was to determine which patient group might suitable for our single-session treatment.The included 17 patients who were symptomatic due relapsing pancreatitis with stones. A 5-Fr miniscope inserted via papilla stone pancreatoscopic laser (PSLL) performed, under direct vision, only one session. If complete...
Abstract A tandem preconcentration method using a chelating resin was exploited for simultaneous multielement determination of trace metals in seawater by inductively coupled plasma mass spectrometry (ICP-MS). In the first step, 500 mL sample adjusted to pH 6.0, and adsorption on 0.4 g Chelex-100 dry weight carried out at 55 °C. After equilibrium, collected glass filter rinsed with 30 ammonium acetate solution (pH 6.0) reduce major elements such as Na, K, Mg, Ca that had been partly adsorbed...
誘導結合プラズマ質量分析法(ICP-MS)及び誘導結合プラズマ発光分析法(ICP-AES)を,日本分析化学会より頒布されている河川水標準物質(JAC 0031,JAC 0032)中の微量元素の多元素定量に適用した.ICP-MS及びICP-AESによる多元素分析においては,河川水試料の直接導入法とともに微量元素に対してキレート樹脂濃縮法を併用することにより,河川水標準物質中の37元素の定量を行うことができた.Caの12300からTmの0.00012μg l-1まで9けたに及ぶ広い濃度範囲の定量値が得られた.認証値が求められている元素については,おおむね認証値と一致した結果であった.又,希土類元素についても,すべて定量することができ,頁岩中濃度で規格化した希土パターンでは重希土類元素の相対存在度が高く,Ceの負の異常がある天然水特有のパターンが得られた.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDirect Determination of Inorganic Ions at Sub-ppb Levels by Ion Chromatography Using Water as a Mobile PhaseWenzhi. Hu, Mamoru. Tominaga, Hiroaki. Tao, Akihide. Itoh, Tomonari. Umemura, and Hiroki. HaraguchiCite this: Anal. Chem. 1995, 67, 20, 3713–3716Publication Date (Print):October 1, 1995Publication History Published online1 May 2002Published inissue 1 October 1995https://doi.org/10.1021/ac00116a015Request reuse permissionsArticle...
Abstract An on-line separation-detection system, liquid chromatography coupled with inductively plasma mass spectrometry (ICP-MS), has been developed and applied to the study on speciation of trace metals in pond water. First, total concentrations dissolved metal ions water were determined by ICP-MS after chelating resin preconcentration. Then, was preconcentrated ultrafiltration using a filter molecular weight permeation limit 10000, providing size exclusion chromatography. Large organic...
Abstract Polystyrene-bound 2,4,6-trimercapto-s-triazine was prepared from (TMT) and Merrifield resin in a single step. Treatment with polymer-bound TMT highly effective for reducing the concentration of residual Pd(II) aqueous organic solutions.
Abstract The distributions of 33 trace metals in the total dissolved fraction (TDF), small molecular weight (SMWF; <10000 Da), and large (LMWF; >10000 Da) surface water from two sampling stations (No. 1 No. 2) Lake Biwa (Japan) were investigated. In experiment, concentrations TDF SMWF determined by inductively coupled plasma mass spectrometry (ICP-MS) using a laboratory-made chelating resin-packed minicolumn for preconcentration metals. LMWF calculated subtracting those TDF....
Abstract The simultaneous multielement determination of trace elements in seawater, especially hydride- and oxoanion-forming elements, has been investigated by inductively coupled plasma mass spectrometry with the aid lanthanum coprecipitation preconcentration. optimum pH was 9.5; at this value, were well recovered major constituents seawater such as Na, Mg, K, Ca significantly reduced concentrated solutions. recovery values obtained for V, Cr(III), Mn, As(III), As(V), Se(IV), Y, Sn,...
In the present study, ICP-MS with a new hybrid simultaneous preconcentration combining solid phase extraction using chelating resin and iron hydroxide coprecipitation in one batch at single pH adjustment (pH 6.0) were developed for multielement determination of trace metal ions seawater. determination, method makes it possible to determine Cr(III), As(V), Se (IV), other 14 elements (Ti, V, Co, Ni, Cu, Zn, Zr, Ge, Cd, Sb, Sn, W, Pb, U) Moreover, speciation analyses Cr, As, Se, dependence on...