Estimation of Surface Area of Gold Nanoparticles Through the Adsorption Amount of Cysteine by Capillary Zone Electrophoresis


Promoting the signal reliability of non-invasive biosensors via N-doped graphene quantum dot modified Prussian blue analogue protective layer for glucose monitoring

Journal of Materials Chemistry. B, Materials for Biology and Medicine


Enhancing self-induced polarization of PVDF-based triboelectric film by P-doped g-C3N4 for ultrasensitive triboelectric pressure sensors


Microdialysis-integrated HPLC system with dual-electrode detection using track-etched membrane electrodes for in vivo monitoring of dopamine dynamics

A capillary high-performance liquid chromatography (HPLC) system equipped with a dual-electrode detector utilizing track-etched membrane electrodes (TEMEs) was combined with a microdialysis sampling setup. The electrochemical detector benefits from the high electrolysis efficiency of TEMEs, allowing for calibration-free coulometric detection and simplifying data analysis to determine the dopamine recovery through a dialysis probe. Additionally, this system was used for in vivo monitoring of dopamine in the right striatum of a mouse brain. Temporal changes in dopamine levels, including an exponential decay immediately after the dialysis probe insertion and an excess release of dopamine induced by a high concentration of potassium ions, confirmed the system's proper operation. Furthermore, subsequent measurements following the intraperitoneal injection of mirtazapine showed no increase in dopamine levels in the right dorsal striatum. The dual-electrode system displayed characteristic dopamine detection behavior, with anodic and cathodic peak pairs indicative of reversible electrochemical reactions. This capability facilitated the identification of the dopamine peak within the complex chromatogram of the mouse brain dialysate. The consistency between dopamine collection efficiency from standard solutions and dialysate indicated the absence of interfering electroactive substances overlapping with the dopamine peak in the chromatogram. This integrated analysis system successfully tracked temporal fluctuations in dopamine concentration within the mouse brain.

Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences


Flow-through Potentiometric Residual Chlorine Sensor Using Activated Carbon Chamber Sandwiched Filter Electrode System

活性炭チャンバを挟持したフィルター電極システムを用いる 流通式電位差計測型残留塩素センサ


Nitrogen-Doped Graphene Quantum Dots Incorporated into MOF-Derived NiCo Layered Double Hydroxides for Nonenzymatic Lactate Detection in Noninvasive Biosensors


Capillary Electrophoretic Characterization of Platinum and Silver Nanoparticles in Aqueous Solution Prepared by a Solution Plasma Process


Enzyme-free triboelectric biosensor with glucose response molecularly imprinted polymer for self-powered biomedical monitoring


Conjugation monitoring of gold nanoparticles with alkanedithiols by capillary zone electrophoresis


Kinetic Analyses of Two-steps Enzymatic Oxidation from Hypoxanthine to Uric Acid with Xanthine Oxidase by Capillary Electrophoresis/Dynamic Frontal Analysis


Direct analysis of airborne microplastics collected on quartz filters by pyrolysis-gas chromatography/mass spectrometry

Journal of Analytical and Applied Pyrolysis


A flow-based enzyme-free biosensor fabricated using track-etched membrane electrodes: Selective and sensitive detection of uric acid


A Practice of the Laboratory Course Using a Personal Spectrometer and Learning Management System

パーソナル吸光度計と学習管理システムを用いた学生実験の実践

学生実験は，限られた授業時間，実験作業スペース，限られた数の機器など，いくつかの制約の下で行われている．これらの制約を緩和するために，予習用のコンテンツを学習管理システム(LMS)でオンライン公開した．2017年度前期より，学生一人ひとりが利用できる計測機器とタブレットを導入した．その後，アプリの改良を重ね，貸出用のタブレットではなく，学生が自分のスマートフォンを利用できるようになった．2022年度前期には，学生実験に一通りの方法が確立した．また，今後の改良点を模索するためにも学生実験終了後にアンケートを取った．本稿では，学生実験の概要，アンケート結果について報告する．

Journal of University Education Research


Simultaneous FIA determination of free and combined chlorine based on the difference in decomposition rate under UV light irradiation

紫外線照射下での光分解反応速度の違いに基づく遊離塩素と結合塩素のFIA同時定量


Detection behavior of phenolic compounds in a dual-electrode system assembled from track-etched membrane electrodes


Feedback standard addition method coupled flow injection analysis Validation by spectrophotometric determination of nitrite in seawater


Kinetic analyses of two-steps oxidation from L-tyrosine to L-dopaquinone with tyrosinase by capillary electrophoresis/dynamic frontal analysis

Tyrosinase catalyzes the oxidation of l-tyrosine in two stages to produce l-dopa and l-dopaquinone stepwise, and l-dopaquinone is subsequently converted to dopachrome. Most of the conventional analyses subjected only one-step reaction from l-tyrosine to l-dopa or from l-dopa to l-dopaquinone. In this study, kinetic analyses of two-steps oxidation of l-tyrosine with tyrosinase were made by capillary electrophoresis/dynamic frontal analysis (CE/DFA). When l-dopa was introduced into a capillary as a sample plug in a CE/DFA format, the enzymatic oxidation continuously occurred during the electrophoresis, and the product l-dopaquinone was subsequently converted to dopachrome which was detected as a plateau signal. A Michaelis-Menten constant of the second-step kinetic reaction, K, was determined as 0.45 ± 0.03 mmol L. In the analysis of the first-step kinetic reaction from l-tyrosine to l-dopa, l-dopa was not resolved by CE/DFA because both l-tyrosine and l-dopa are electrically neutral. The l-dopa formed and co-migrated at the l-tyrosine zone was calibrated beforehand with the final product of dopachrome detected as a plateau signal. Constantly formed l-dopa was successfully detected as a plateau signal of dopachrome, and a Michaelis-Menten constant of K was also determined as 0.061 ± 0.009 mmol L by the CE/DFA. CE/DFA is applicable to two-steps enzymatic reactions.

Analytical Biochemistry: Methods in the Biological Sciences


Highly stable gold nanoparticles in an aqueous solution without any stabilizer prepared by a solution plasma process evaluated through capillary zone electrophoresis


Boron-doped Graphene Quantum Dots Anchored Carbon Nanotubes as a Noble Metal-free Electrocatalyst of Uric Acid for Wearable Sweat Sensor


Interference of high degrees salt on spectrophotometric flow injection analysis Quantitative error of nitrite from schlieren effect and salt effect

フローインジェクション吸光光度法における高濃度塩の干渉 –シュリーレン効果及び塩効果による亜硝酸イオンの定量誤差–


Designing bimetallic Ni-based layered double hydroxides for enzyme-free electrochemical lactate biosensors


An Improved Reflection Colorimeter Integrated with a Coaxial Optical-fiber Cable for Highly Sensitive Solid-phase Colorimetry Using a Membrane Filter


Development of soil sample preparation by means acid digestion without heating with teflon method for nickel analysis


Determination of Two-Steps Acid Dissociation Constants of L-Ascorbic Acid by Capillary Zone Electrophoresis


Kinetic analysis of the transphosphorylation with creatine kinase by pressure-assisted capillary electrophoresis/dynamic frontal analysis


Kinetic analysis of an enzymatic hydrolysis of p-nitrophenyl acetate with carboxylesterase by pressure-assisted capillary electrophoresis/dynamic frontal analysis


Evaluation of oxygen contribution on delithiation process of Li-rich layered 3d transition metal oxides


Kinetic analysis of substrate competition in enzymatic reactions with β-D-galactosidase by capillary electrophoresis / dynamic frontal analysis

Journal of Pharmaceutical and Biomedical Analysis


Capillary Electrophoretic Characterization of Water-Soluble Carbon Nanodots Formed from Glutamic Acid and Boric Acid under Microwave Irradiation


Determination of acid dissociation constants of flavin analogues by capillary zone electrophoresis

Acid dissociation constants (pK ) of nine kinds of flavin analogues as molecular catalyst candidates were determined by CZE. Although some of the analogues are instable and degradable under the light exposure or in alkaline aqueous solutions, the effective electrophoretic mobility of the flavin analogue of interest has been measured with the residual substance. The pK values of the flavin analogues were analyzed through the changes in the effective electrophoretic mobility with varying pH of the separation buffer. One or two steps pK values were determined by the analysis. One of the degraded species from the flavin analogues, lumichrome, was also detected in the CZE analysis, and its pK values were also determined. While coexisting impurities generated over the storage conditions were found in some analogues, the pK values of the target analogues were successfully determined with the help of the CZE separations. A pressure-assisted CZE was utilized for the determination or the estimation of the pK values of such analogues as possessing carboxylic acid moiety.


Capillary Electrophoresis/Dynamic Frontal Analysis for the Enzyme Assay of 4-Nitrophenyl Phosphate with Alkaline Phosphatase


Capillary Electrophoretic Characterization of Carbon Nanodots Prepared from Glutamic Acid in an Electric Furnace


Statistical Evaluation of Conventional and Portable Instrumentations for Cr(VI) Analysis on Chemistry Laboratory Waste Water


Track-etched membrane-based dual-electrode coulometric detector for microbore/capillary high-performance liquid chromatography


Determination of Acid Dissociation Constants of Degradable Catecholamines by CZE

キャピラリーゾーン電気泳動法によるカテコールアミン類の酸解離定数の決定


Dispersion of Graphene in an Aqueous Solution with Poly(sodium 4-styrenesulfonate) Monitored by Capillary Electrophoresis


Polyethylene Glycols for the Dispersion Development of Graphene in an Aqueous Surfactant Solution Studied by Affinity Capillary Electrophoresis


A Rapid Enrichment Technique for the Ultratrace Determination of Nickel in Water Samples Using a Nanofiber-composite Membrane Filter

A new method for the rapid enrichment and highly sensitive determination of nickel ion has been developed by using a nanofiber-composite membrane filter, which was fabricated by stacking a nanofibrous material made of nylon 6 over a water-permeable membrane filter. The noncharged nickel-α-furil dioxime complex was adsorbed on a nanofibrous layer of the membrane filter under significantly higher flow rates than those used for conventional solid-phase extraction techniques. Highly sensitive determinations with detection limits at sub-parts per billion levels were achieved by enrichment from 50 mL of the complex solution, and the enrichment was completed within 3 min. The color that was developed on the membrane filter was successfully subjected to visual colorimetric analysis and quantitative determination by solid-phase spectrophotometry. In addition, colorimetric determination was feasible with a handheld spectrometer after elution of the colored agent with 50 μL of acetone. This combination of rapid enrichment and spectrometric measurement in a small-volume sample provides a useful analytical method suitable for on-site analysis, which requires neither expensive instruments nor high laboratory skills.


Migration Behavior of Carbon Nanotube in Capillary Electrophoresis with Sodium Dodecyl Sulfate and Water-Soluble Nonionic Polymer


A Triple-Electrode Based Dual-Biosensor System Utilizing Track-Etched Microporous Membrane Electrodes for the Simultaneous Determination of L-Lactate and D-Glucose

Bulletin of the Chemical Society of Japan


Determination of Acid Dissociation Constants of Hydrochlorothiazide and Its Degradant through Measurement of the Effective Electrophoretic Mobilities in CZE

CZEによる電気泳動移動度測定に基づくヒドロクロロチアジドとその分解生成物の酸解離定数の決定


Solid-phase Visual Colorimetry for Trace As(III) Using a Nanofiber-composite Membrane Filter

ナノファイバー複合化メンブランフィルターを用いる微量ヒ素(III)の固相目視比色定量


Determination of the Acid-Base Dissociation Constant of Acid-Degradable Hexamethylenetetramine by Capillary Zone Electrophoresis

The acid-base equilibrium of hexamethylenetetramine (hexamine) was analyzed with its effective electrophoretic mobility by capillary zone electrophoresis. Although hexamine is degradable in a weakly acidic aqueous solution, and the degraded products of ammonia and formaldehyde can be formed, the effective electrophoretic mobility of hexamine was measured in the pH range between 2.8 and 6.9. An acid-base dissociation equilibrium of the protonated hexamine was analyzed based on the mobility change, and an acid dissociation constant of pKa = 4.93 ± 0.01 (mean ± standard error, ionic strength: 0.020 mol dm(-3)) was determined. The monoprotic acid-base equilibrium of hexamine was confirmed through comparisons of its electrophoretic mobility with the N-ethylquinolinium ion and with the monocationic N-ethyl derivative of hexamine, as well as a slope analysis of the dissociation equilibrium.


Analysis of Acid Dissociation Equilibrium of Bupropion by Capillary Zone Electrophoresis After the Heat-Degradation


Variation of Water Quality Arising from the Hydrolysis of Aluminum in the Acidified River

Journal of Water and Environment Technology


Visual Threshold Detection of Iron(III) at ppb Level Based on Homo-binuclear Complex Formation System Equipped with Ion-exchanger Colorimetry

同種金属二核錯体系を用いるイオン交換体比色法によるppbレベルの鉄(III)イオンの目視閾値判定


Determination of Ultra-Trace Mercury(II) by Flow-injection/Anodic Stripping Voltammetry Using a Track-etched Microporous Membrane Electrode

A new flow-injection/anodic stripping voltammetry has been demonstrated to assess ultra-trace mercury(II) using track-etched microporous membrane electrodes. The electrodes were prepared by the sputtering of gold or platinum onto both sides of a membrane filter with a smooth flat surface and with cylindrical pores having uniform diameter. The deposition of mercury from a mercury(II) solution was performed while the sample solution flowed through the membrane electrodes. After the deposition step, an anodic stripping voltammogram was obtained by sweeping the potential from 0 to +0.8 V vs. Ag/AgCl. In this case, the sample solution flowed through the pores of the 10-μm-thick membrane filters. Efficient electrolysis occurred during passage of the sample solution through the electrode, of which the pore size was 0.4 μm. In this study, the voltammetry described above was demonstrated using an FIA system. The continuous-flow mode showed a detection limit of 0.04 μg L(-1) when the experimental conditions of the flow rate and the deposition time were set at 0.5 mL min(-1) and 180 s. In the sample-injection mode equipped with a 1-mL sample loop, a linear relation was found for 0.5-4.0 μg L(-1) of a mercury(II) standard solution (r = 0.995). The detection limit was 0.05 μg L(-1). This method was applied to the ultra-trace determination of mercury(II) in river-water samples.


Flow-based Biosensing System for Glucose Fabricated by Using Track-etched Microporous Membrane Electrodes


Simple and Rapid Dtermination of Boron in the Wastewater with Azomethine H Using Accelerating Effect of Ammonium Ion


Determination of Copper(II) in Concentrated Alkaline Solutions by Anodic Stripping Voltammetry with a Microporous Membrane Electrode

多孔質膜金電極における陽極溶出ボルタンメトリーによる高濃度アルカリ水溶液中の微量銅イオンの定量

A new anodic stripping voltammetry (ASV) using a microporous membrane electrode has been developed for the on-line monitoring of trace CuII in concentrated alkaline solutions. Microporous membrane electrodes were prepared by plating gold onto membrane filters made of polypropylene (PP). By SEM observations, it was confirmed that the membrane filter was modified by gold fine particles. The microporous membrane electrodes were set in a penetrated-type electrochemical flow-cell, and CuII was deposited while the sample solution passed through the electrode. The concentration of CuII was estimated with the anodic stripping peak currents. The calibration curve showed linearity within a range of 0 - 25 μg L-1 CuII in a 48% KOH solution. The proposed method will become a useful technique for an on-line monitoring system for trace CuII, which has been in urgent demand by the semiconductor manufacturing.


Visual Speciation Analysis of AsIII and AsV by Solid-phase Extraction to a Membrane Filter

メンブランフィルターへの固相抽出によるAs(III)およびAs(V)の目視分別分析


The improvement of water quality in an acidic river environment using waste concrete aggregates


Folin-Chiocalteu colorimetric analysis using a scanner for rapid determination of total polyphenol content in many test samples


A dual-electrode flow sensor fabricated using track-etched microporous membranes

A new dual-electrode flow sensor has been fabricated by piling the microporous membrane electrodes which have 7-10μm thickness. The electrode was prepared by sputtering of platinum onto both sides of the membrane filter which contain a smooth flat surface as well as cylindrical pores with uniform diameters. The electrolysis is performed when the sample solution flows through the membrane electrode, and a generated analyte on the first working electrode is instantaneously transported to the surface of second working electrode which is located at the downstream of the first one. In this case, the sample solution surely flows through the pores of the membrane filters. As the result, highly efficient electrolysis was achieved at each electrode, and the collection efficiency values as high as 100% were obtained in the wide range of flow rate. Good responses to the injections of sample solutions were also confirmed in the FIA system.


Stripping Voltammetry with a Flow-through Electrochemical Cell for Simultaneous Trace Determination of Nickel(II) and Copper(II) in Concentrated Alkaline Solutions

フロー電解セルを用いるストリッピングボルタンメトリーによる高濃度アルカリ水溶液中の銅(II)とニッケル(II)の同時微量定量


Highly Sensitive Visual Colorimetry for Chromium (VI) by Ion-Pair Solid-Phase Extraction on a PTFE-Type Membrane Filter

PTFE製メンブランフィルターへのイオン対固相抽出によるクロム(VI)の高感度目視定量

A simple and highly sensitive visual determination method for Cr(VI) based on ion-pair solid-phase extraction to a PTFE-type membrane filter has been developed. A colored complex that was formed through a reaction between Cr(VI) and diphenylcarbazide was adsorbed quantitatively under the coexistence of sodium dodecyl sulfate (SDS). The colored filter was sandwiched in between two slide glasses after putting a drop of water in order to prevent discoloration, which was caused by drying the colored filter. The concentration of Cr(VI) was determined through a visual comparison with the color standard. The visual detection limit was 0.3 μg dm-3. The calibration curve, assessed with the reflection spectrometric response (540 nm), was linear in the concentration range 0∼4 μg dm-3 (r = 0.998). The detection limit, defined as three-times the standard deviation of the reagent blank, was 0.07 μg dm-3 in 100 cm3 of the sample solution. The relative standard deviation (RSD) for 0.3 μg dm-3 Cr(VI) was 6.0% (n = 5). The proposed method was applied to the determination of Cr(VI) extracted from metallic parts.

PTFE製のメンブランフィルターを用いた固相抽出によるクロム(VI)の高感度目視定量法を開発した．硫酸酸性下におけるクロム(VI)とジフェニルカルバジドとの反応によって生成した有色の錯体は，ドデシル硫酸ナトリウム共存下での減圧ろ過によりメンブランフィルターに定量的に吸着した．本研究では，純水を滴下して2枚のスライドガラスに挟むことで少なくとも30分間はフィルターの着色が安定することを見いだし，色の濃淡によって微量のクロム(VI)を目視で定量できることがわかった．ろ過体積が100 cm3の場合での目視検出限界は0.3 μg dm-3であった．また，反射吸収測定では0∼4 μg dm-3の範囲で直線の検量線が得られた(r＝0.998)．検出限界は0.07 μg dm-3であり，0.3 μg dm-3のときの相対標準偏差は6.0%(n＝5)であった．本法を実試料へ応用したところ，電熱原子吸光光度法(ET-AAS)による全クロム濃度の測定結果と一致した．


Ultra-Trace Determination of Lead(II) in Water Using Electrothermal Atomic Absorption Spectrometry after Preconcentration by Solid-Phase Extraction to a Small Piece of Cellulose Acetate Type Membrane Filter

A simple and inexpensive preconcentration technique has been developed for the ultra-trace determination of lead(II) using electrothermal atomic absorption spectrometry (ETAAS). The lead(II) complex with dicyclohexano-18-crown 6-ether (DC18C6) was extracted to a small piece of cellulose acetate-type membrane filter (2 × 5 mm) merely by vigorously eccentric stirring for 120 min under the coexistence of sodium dodecyl sulfate (SDS) at around pH 7. The extraction medium was inserted into a graphite cuvette for the determination of lead(II) by ETAAS. A linear relation was obtained for the range of 0.1-5.0 ng in 10 ml of lead(II) standard solution (r = 0.998). The detection limit was found to be 0.03 ng of lead(II) in 10 ml (0.003 µg l(-1)) of water sample. The proposed method was applied to the ultra-trace determination of lead(II) in river water, underground water, tap water, and snow fall samples.


Visual Determination of Trace Zinc(II) by Reverse Phased TLC with Tetrakis(4-carboxyphenyl)porphine

テトラキス(4-カルボキシフェニル)ポルフィンを用いる逆相薄層クロマトグラフィーによる亜鉛イオンの目視定量

A new visual colorimetric and fluorimetric determination of trace zinc(II) has been developed by thin-layer chromatography (TLC) with tetrakis(4-carboxyphenyl)porphine (TCPP). In this method, the spots that are dependent on each metal ion concentration of zinc(II), copper(II), cadmium(II), and mercury(II) appear selectively on an octadecylsilanized (ODS) silica thin layer by chromatographic separation with 90% (w/w) methanol. The yellow-colored zinc(II)-TCPP complex is distinguished visually from the other species with different colors. The zinc(II) concentration is determined by a visual comparison of the yellow-colored spot. The visual detection limit is 3 × 10-6 mol dm-3, defined as the minimum concentration that is visually distinguishable against a reagent blank. The calibration curve assessed with the densitometric responses is linear in the concentration range 0∼5 × 10-6 mol dm-3. The detection limit, which is calculated with 3 ς at the reagent blank, is 3 × 10-7 mol dm-3. On the other hand, the fluorimetric detection of the zinc(II)-TCPP complex is also available under the irradiation of UV light in the dark, and the visual detection limits is 8 × 10-7 mol dm-3. The calibration curve in the fluorimetric mode is linear in the concentration range 0∼3 × 10-6 mol dm-3, and the limit of detection is 3 × 10-7 mol dm-3. The effect for the determination of zinc(II) is not found in the presence of magnesium(II), aluminum(III), calcium(II), chromium(III), iron(III), nickel(II), and cadmium(II). The proposed method has been successfully applied to the determination of zinc(II) in river-water samples around an old mine.


Synthesis and spectral properties of polymethine-cyanine dyenitroxide radical hybrid compounds for use as fluorescence probes to monitor reducing species and radicals

Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy


On-site Determination of Trace Nickel in Liquid Samples for Semiconductor Manufacturing by Highly Sensitive Solid-phase Colorimetry with -Furil Dioxime


Highly Selective Spot Test of Aluminum(III) at ppb Level by Reverse Phase TLC with Sample Drop Loading

液滴試料の逆相薄層クロマトグラフィーによるppbレベルのアルミニウムイオンの選択的スポットテスト

A highly selective, sensitive, and practically useful spot test of aluminum(III) has been developed. In this method, a 5μL of ethanolqueous (1+1) sample solution containing metal chelates with 2,2'-dihydroxyazobenzene(DHAB) is loaded on a hydrophobic surface of an octadecylsilanized(ODS) silica plate, and thin-layer chromatography(TLC) is directly performed without drying the sample drop. The fluorescent aluminum(III) chelate remains selectively at the loading position, whereas the excess reagent, DHAB, and the chelates of the other metal ions are eluted. The fluorescent spot, which is observed only at the loading position, retains the circular shape of the initial interface between the sample drop and the plate. Immediately performing chromatographic separation after sample loading is effective for avoiding aluminum(III) contamination, which is caused by elution from the ODS-silica, because of the slow rate of formation of the aluminum (III)-DHAB complex. Furthermore, the matrix tolerance of the proposed method is superior to that of the previous method, in which chromatographic separation is performed after drying the sample drop. The visual detection limit is 1.0μg/L. The calibration curve assessed with the densitometric responses with an excitation beam(505nm) is linear over the concentration range up to 27 μg/L. The detection limit, which is calculated with 3.3ς. at a concentration of 1.4μg/L, is 0.2μpg/L(n=5). The proposed method has been applied to the determination of parts per billion levels of aluminum(III) ion in river-water samples.


Visual Colorimetry for Trace Antimony(V) by Ion-Pair Solid-Phase Extraction with Bis[2-(5-chloro-2-pyridylazo)-5-diethylaminophenolato]cobalt(III) on a PTFE Type Membrane Filter

A new visual colorimetry for trace antimony(V) based on ion-pair solid-phase extraction to a PTFE-type membrane filter with bis[2-(5-chloro-2-pyridylazo)-5-diethylaminophenolato]cobalt(III) ion ([Co(5-Cl-PADAP)(2)](+)) has been developed. Experiments showed that hexachloroantimonate(V) ion (SbCl(6)(-)) was adsorbed with [Co(5-Cl-PADAP)(2)](+) to the front surface of the PTFE filter. The adsorption of antimony(V) ion was promoted by the addition of lithium chloride as a source of chloride ion. The excess reagent of [Co(5-Cl-PADAP)(2)](+) was eluted by rinsing with a 10 wt% methanol aqueous solution. In this case, the slow rate of the hydrolysis reaction of SbCl(6)(-) and the difference of the hydrophobicity of the ion pairs were important for adsorption and separation with a PTFE-type membrane filter. The antimony(V) concentration was determined through a visual comparison with a standard series. The visual detection limit was 0.10 microg. The calibration curve assessed with the reflection spectrometric responses at 580 nm was linear in the concentration range of 0.10 - 1.2 microg (r = 0.996). The proposed method has been applied to the determination of sub-microgram levels of antimony(V) ion in water samples.


First Synthesis and Properties of Calix[4]arene with Two Alternately Arranged Phloroglucinols and Two p-tert-Butylphenols


Highly Sensitive Colour Change System within Slight Differences in Metal Ion Concentrations Based on Homo-Binuclear Complex Formation Equilibrium for Visual Threshold Detection of Trace Metal Ions


Visual Threshold Detection of Trace Metal Ions Using a Bi-Functional Metallochromic Reagent


Visual Fluorimetry of Trace Aluminium by Specific Immobilization with o,o-Dihydroxyazobenzene on an Octadecylsilanized Silica Thin Layer


Drop Based Visual Fluorometry of Trace Aluminium at ppb Level with 2,2-Dihydroxyazobenzene by Using Octadecylsilanized Silica Thin Layer


高速液体クロマトグラフィー四重電極型検出システムのセットアップ作業報告

高速液体クロマトグラフィー四重電極型検出システムのセットアップ作業報告

徳島大学技術支援部技術報告

徳島大学技術支援部技術報告


ヒメウコギの葉に含まれる無機成分の濃度分布と季節変化

ヒメウコギの葉に含まれる無機成分の濃度分布と季節変化


Inhibition Assay of Theophylline by Capillary Electrophoresis/Dynamic Frontal Analysis on the Hydrolysis of p-Nitrophenyl Phosphate with Alkaline Phosphatase