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Hitoshi YOSHIDA, Shunitz TANAKA, Takashi KANETA, Yuji HIRAMA
1991 Volume 7 Issue 5 Pages
673-682
Published: October 10, 1991
Released on J-STAGE: June 30, 2006
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Developments in the migrating systems to improve the resolution and sensitivity of capillary tube isotachophoresis (ITP) are described. They are related to the use of complex-forming equilibria in the migrating column and nonaqueous solvents as the migrating medium. The considered sources of ligand for the complex-forming equilibria are (a) the counter ion in the leading electrolyte, (b) the neutral ligands added into the leading electrolyte and (c) the terminating ions. Actual separations performed by these systems are shown and their features and advantages are discussed. Migrating systems consisting of nonaqueous solvents such as dimethylformamide and acetonitrile enable the migration of analyte species which can not be realized in an aqueous medium to improve the selectively and sensitivity. Combining ITP with solvent extraction provides useful analytical techniques.
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Shizuo FUJIWARA, Yuko NISHIMOTO
1991 Volume 7 Issue 5 Pages
683-685
Published: October 10, 1991
Released on J-STAGE: June 30, 2006
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The melting of the eutectic compound of sodium chloride and water has been investigated in detail by differential scanning calorimetry and nuclear magnetic resonance. It has been found that the melting point of the eutectic compound of sodium chloride and water is -21.7°C, and not -22.3°C as it has been reported in the literature. The latter value is assigned to the melting of the oxygen adduct of the eutectic compound. The oxygen adduct is formed in salt solutions with concentrations below 0.2mol/l NaCl; the formation is maximal at around 0.1mol/l NaCl. The latter salt concentration is almost equal to that of the human blood and of the physiological saline water for mammals. It is referred to as the physiological salinity. These findings should have a fundamental connection with physicochemical and physiological problems in nature, and suggest that the physiological salinity plays a role of basic importance in biological systems. An interpretation for the findings is also presented.
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Shizuo FUJIWARA, Yuko NISHIMOTO
1991 Volume 7 Issue 5 Pages
687-690
Published: October 10, 1991
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We have found that the enantiomeric isomers of amino acids give different effects on melting of the oxygen adduct of the eutectic compound of sodium chloride and water. The oxygen adduct is formed only in an aqueous sodium chloride solution with concentration below 0.2mol/l NaCl. Formation of the adduct is maximal at around 0.1 mol/l NaCl. The latent heat of melting, Δ
H, of the oxygen adduct of the eutectic compound under copresence of the L-form enantiomeric isomer of amino acids such as aspartic acid, leucine or threonine is by 5kJ/mol NaCl lower than that under copresence of the D-form one. The difference is almost zero with the isomers of serine and phenylalanine. The observed effects suggest that the oxygen adduct of the eutectic compound which is in association with the L-form isomers of aspartic acid, leucine and threonine has thermodynamically higher possibility to get into molten/liquid state than that with the D-form one. The said phenomena are observed only when the concentration of the solution is in the range of around
0.1mol/l NaCl. Furthermore, such a difference does not hold with the enantiomeric isomers of serine or phenylalanine. The specific value of the salt concentration cited above lies in the range almost equal to that of the human blood or that of the physiological saline water for mammals. For the convenience of discussion, it is referred to as the physiological salinity. Thus, it is concluded that the physiological salinity and oxygen will have a basic connection with the biosynthesis and reactions of proteins which are done with identification of the enantiomeric isomers of amino acids. For the interpretation of the observed results which suggest the significance of the specific concentration of 0.1mol/l NaCl, the conceptual idea of the "molecular space", which has been suggested before by one of the present authors (S. F.), will be referred to.
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Shunya ARAGAKI, Naoyoshi EGASHIRA, Hiroshi IWANAGA, Kazuya OHGA
1991 Volume 7 Issue 5 Pages
691-694
Published: October 10, 1991
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A carbon-paste electrode containing octadecylamine was used for voltammetric determination of pyridoxal in aqueous solutions. After chemical deposition of pyridoxal on the modified electrode through Schiff base formation, differential pulse voltammetry exhibited a well-developed reduction wave at +0.52V
vs. Ag/AgCl, due to the electrooxidation product of the Schiff base or pyridoxal which was regenerated by hydrolysis. No reduction wave was detected for compounds bearing a formyl group except for salicylaldehyde, which showed an analogous reduction wave at a potential of +0.80V. This fact suggests that the electrode can be used for selective determination of pyridoxal. A linear calibration curve was obtained in a concentration range of 1×10
-5 -to 2×10
-4M.
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Kikuo TAKATERA, Tadashi WATANABE
1991 Volume 7 Issue 5 Pages
695-698
Published: October 10, 1991
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An inductively coupled plasma mass spectrometer was employed as an iron detector in gel permeation liquid chromatography to separate ferritin, hemoglobin, myoglobin, and cytochrome-c, by use of potassium hexacyanoferrate(III) as the iron standard. The absolute detection limits for the four proteins were 0.01, 1, 0.7, and 0.4μg, respectively, at 10μl injections. These values were an order-of-magnitude lower than those obtained by using an inductively coupled plasma atomic emission spectrometer as detector. From the peak area in the Fe chromatograms, the number of Fe atoms per molecule was evaluated for myoglobin and cytochrome-c to be 0.97 and 1.0, respectively.
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Masako MAEDA, Kwang Hun YANG, Akio TSUJI
1991 Volume 7 Issue 5 Pages
699-702
Published: October 10, 1991
Released on J-STAGE: June 30, 2006
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A direct, solid-phase time-resolved fluoroimmunoassay (TRFIA) for measuring 17
α-hydroxyprogesterone (17-OHP) in dried blood spotted on filter paper is described. The assay is based on competition between europium (Eu)-la beled 17- OHP and free 17-OHP in blood specimens for polyclonal rabbit anti-17-OHP antibodies. The antibody-label complex is separated by binding to anti-rabbit antibodies coated onto microtiter plate wells. The amount of bound Eu-labeled 17- OHP is inversely proportional to the amount of 17-OHP in the sample. After separation of bound and free fractions, the fluorescence intensity of Eu is measured by TRFIA. 17-OHP values obtained by this method correlated well with those obtained by enzyme linked immunosorbent assay (ELISA) (
r=0.969). The detection limit of 17-OHP was 1pg/ assay, being almost equivalent to those of the chemiluminescent and fluorescent enzyme immunoassays developed previously.
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Mikita ISHII
1991 Volume 7 Issue 5 Pages
703-707
Published: October 10, 1991
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The quenching of chemiluminescence between cyclohexane and methylsilicone solid polymer was applied to the determination of water in nonaqueous solutions using a flow injection method. The proposed system comprises one single flow line and is expected to serve as a rapid, simple and highly selective method. The analytical time required was less than 4s for a single run. Although 10(v/v)% tetrahydrofuran and 10(v/v)% acetonitrile gave interfering signals of a few percent to the quenching response of a 0.7(v/v)% solution of water, thirty five ionic species (such as metal ions) did not interfere with the quenching signal of water, even when their concentration was as large as 1×10
-2M. The detection limit was 0.1(v/v)% for 10μl sample injection, and the relative standard deviation was 2.3% in 10 repeated runs involving 10μl injections of 1.0(v/v)% solutions of water. The present method was compared with that of Karl Fischer by analyzing actual samples, coolant and hydraulic fluids used for automobiles; the values obtained by the two methods agreed well with each other.
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Kenichiro NAKASHIMA, Kouichi MAKI, Shinki KAWAGUCHI, Shuzo AKIYAMA, Yu ...
1991 Volume 7 Issue 5 Pages
709-713
Published: October 10, 1991
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Peroxyoxalate chemiluminescence (CL) assay of hydrogen peroxide (H
2O
2) or glucose was developed by using 2, 4, 6, 8-tetrathiomorpholinopyrimido[5, 4-
d]pyrimidine as a fluorescent component and bis(2, 4, 6-trichlorophenyl)oxalate (TCPO) as an oxalate. Linear relationships between CL intensity and final concentration of H
2O
2 from 10
-8 to 10
-4M were obtained. The detection limit at the ratio of CL intensities for sample and blank (
S/
B) of 3 was 10nM. The precision for five replicate measurements at 10
-5 and 10
-6M of H
2O
2 were 17.6 and 15.7% of relative standard deviations, respectively. α-D-Glucose was transformed to
β-D-glucose with mutarotase and converted to H
2O
2 and D-gluconic acid with glucose oxidase, which was detected by using peroxyoxalate CL reaction. A linear calibration graph was obtained up to 1.5×10
-4M of glucose solution. The method was applied to the assay of glucose in human serum. The recovery was 98.2% (
n=4). The method correlated well with the conventional colorimetric method (
r=0.968).
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Kenichiro NAKASHIMA, Naoko HAYASHIDA, Shinki KAWAGUCHI, Shuzo AKIYAMA, ...
1991 Volume 7 Issue 5 Pages
715-718
Published: October 10, 1991
Released on J-STAGE: June 30, 2006
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A rapid and sensitive flow-injection method with peroxyoxalate chemiluminescence (CL) detection for the determination of glucose and uric acid by using an immobilized enzyme reactor is described. CL produced in a flow cell by the reaction of hydrogen peroxide with bis(2, 4, 6-trichlorophenyl)oxalate and a fluorescent compound, 2, 4, 6, 8-tetrathiomorpholinopyrimido[5, 4-
d]pyrimidine, was monitored. Linear responses between the concentration and the CL intensity for glucose and uric acid were obtained up to 3×10
-4M (6nmol per 20μl injection,
r=0.999) and 1×10
-5M (0.2nmol per 20μl injection,
r=1.000), respectively; both limits of detection were the same (5×10
-7M, 10pmol per 20μl injection, S/N>3). The relative standard deviations for ten replicate measurements were 1.1% for glucose (2×10
-5M, 0.4 nmol/injection) and 2.2% for uric acid (5×10
-6M, 0.1nmol/injection). Good correlations between the results of serum glucose or uric acid assay by the proposed methods and by the conventional colorimetric methods (
r=0.994for glucose and
r=0.986 for uric acid) were obtained.
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Atsushi YAMAMOTO, Akinobu MATSUNAGA, Kazuichi HAYAKAWA, Eiichi MIZUKAM ...
1991 Volume 7 Issue 5 Pages
719-721
Published: October 10, 1991
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A photometric detector for an optically active compound is described in which two polarizers are set on both sides of the flow cell. When a nonchromophoric, optically active compound passes through the cell, the intensity of natural light transmitted through the polarizers and flow cell is changed. The detection of such a sample is possible photometrically. A large inclination angle between the polarizers increases the absorbance change and allows dextrorotatory and levorotatory to be differentiated. The direct HPLC/photometric detection of sugars is presented as an axample of this device.
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Junichi GOTO, Gang SHAO, Motofumi ITO, Takeo KURIKI, Toshio NAMBARA
1991 Volume 7 Issue 5 Pages
723-726
Published: October 10, 1991
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The simultaneous determination of (
R)- and (
S)-penbutolols in plasma by high-performance liquid chromatography (HPLC) with fluorescence detection is described. The penbutolol enantiomers were derivatized with a chiral axis reagent, (aS)-2′-methoxy-1, 1′-binaphthalene-2-carbonyl cyanide, and the diastereomeric esters formed were resolved by HPLC on a normal-phase column employing 0.005% triethylamine in hexane/ethyl acetate (6:1, v/v) as a mobile phase. The combined use of a Sep-pak C
18 cartridge and an ion-exchange gel, carboxymethyl Sephadex LH-20, was effective for efficient cleaning of penbutolol in plasma. The enantiomeric drugs spiked to the plasma were recovered at a rate of over 96% with satisfactory reproducibility. The quantitation limit of each enantiomer was 500pg/ml. The plasma-level profile of penbutolol enantiomers in a dog administered with the racemate was investigated by the newly developed method.
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Kyoji UENO, Hiroyuki FUJITOMO, IKUKO NISHINO, Tsuneji UMEDA
1991 Volume 7 Issue 5 Pages
727-731
Published: October 10, 1991
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A highly sensitive, selective and rapid reversed-phase liquid chromatographic method using a column-switching technique has been developed for the simultaneous determination of a new dihydropyridine calcium blocker, methyl (±)-4, 7-dihydro-3- isobutyl-6-methyl-4-(3-nitrophenyl)thieno[2, 3-
b]pyridine-5-carboxylate (I) and its pyridine metabolite, methyl 3-isobutyl-6-methyl-4-(3-nitrophenyl)thieno[2, 3-
b]pyridine-5-carboxylate (II), in dog plasma. Compounds I and II were determined with electrochemical detection at +0.50V and by ultraviolet detection at 250nm, respectively. The limits of the determination for compounds I and II were 0.2 and 2ng ml
-1, respectively, using 1ml of dog plasma. Good liner relationships were found between the peak areas and the plasma concentrations of compounds I and II in the ranges from the lower limit of determination to 200ng ml
-1. The method was applied to preliminary pharmacokinetic studies after oral administration of compound I to beagle dogs.
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Ken-ichi MAWATARI, Fumio IINUMA, Mitsuo WATANABE
1991 Volume 7 Issue 5 Pages
733-736
Published: October 10, 1991
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A high performance liquid chromatographic method involving postcolumn ultraviolet (UV) irradiation and fluorometric detection has been developed for the simultaneous determination of nicotinic acid and nicotinamide in human serum. These compounds are separated by reversed-phase chromatography using a 0.07M potassium dihydrogenphosphate solution (pH 4.5) containing 75mM hydrogen peroxide and 5μM copper(II) sulfate as a mobile phase. The compounds in the column effluent are irradiated with ultraviolet light to produce fluorescence. This fluorescence is monitored with excitation at 322nm and emission at 380nm. The calibration curves for nicotinamide, nicotinic acid and N
1-methylnicotinamide are linear over the ranges of 0.6-136, 0.7-166 and 5.5-220ng, respectively. The mean recoveries of nicotinamide and nicotinic acid from serum are more than 93%.
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Kenji KANO, Bunji UNO, Chie KAWASAKI, Kiyomi HORIKI, Satoshi KAWAI
1991 Volume 7 Issue 5 Pages
737-739
Published: October 10, 1991
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A high performance liquid chromatographic method for the determination of pyrroloquinoline quinone (PQQ) is described. PQQ reacts readily with acetone in a weakly alkaline medium, giving a stable adduct, 5-acetonyl PQQ. The adduct was separated on a Develosil C
18-5 column using a mixture of methanol and 0.06M phosphoric acid, and was detected at 254nm. The response was linear over the range (1-20)×10
-6M of PQQ and the detection limit was 2pmol for a 20-μl injection volume.
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Tadashi OHKUBO, Masakiyo KUDO, Kazunobu SUGAWARA
1991 Volume 7 Issue 5 Pages
741-743
Published: October 10, 1991
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A high-performance liquid chromatographic method was developed for the assay of ofloxacin in serum. The serum samples were filtered through a Molcut II membrane filter after partial deproteinization in order to remove proteins. The filtrate was preseparated on a reversed-phase precolumn and introduced onto a reversed-phase analytical column by applying column-switching techniques. Ofloxacin and nalidixic acid as internal standards were detected by absorbance measurements at 300nm. Using this system the concentration of ofloxacin could be determined at a limit of the order of 20ng/ml, with a linear dynamic range of 80-4000ng/ml. This procedure was applied to pharmacokinetic studies of healthy volunteers treated with ofloxacin.
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Yoshifumi AKAMA, Aijun TONG
1991 Volume 7 Issue 5 Pages
745-747
Published: October 10, 1991
Released on J-STAGE: June 30, 2006
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Aluminum and indium chelates with 1-phenyl-3-methyl-4-benzoyl-5-pyrazolone (PMBP) were separated using a Shim-pack ODS column and pure acetonitrile or acetonitrile saturated with sodium chloride as the mobile phase. The In-PMBP chelate was not retained on the stationary phase with the acetonitrile mobile phase containing sodium chloride, indicating that this chelate decomposed to the charged species in the column. Using acetonitrile saturated with sodium chloride as the mobile phase, the concentration range 0-1.8×10
-4M for Al- and In-PMBP complexes resulted in linear calibration graphs. Precisions of better than 2.6% for Al and 3.6% for In were achieved. The method provided detection limits of ca. 5×10
-7M for Al and In in a 5μl injection, using detection at 290nm.
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Takeshi GOMYO, Yasushi MORISHIMA, Teruo TACHIBANA, Shigeru KOBAYASHI, ...
1991 Volume 7 Issue 5 Pages
749-756
Published: October 10, 1991
Released on J-STAGE: June 30, 2006
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An analytical method for a fungicide, (
E)-4-chloro-α, α, α-trifluoro-
N-(1-imidazole-1-yl-2-propoxyethylidene)-
o-toluidine (triflumizole), and its metabolite 4-chloro-α, α, α-trifluoro-
N-(1-amino-2-propoxyethylidene)-
o-toluidine, in crops is described. These compounds in crops are extracted with methanol and then cleaned by liquid-liquid partition and column chromatography. Determinations were performed by both high performance liquid chromatography and gas chromatography. The detection limit was set at 0.02ppm. The recoveries ranged from 72 to 101%.
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Yoshikazu KIKUTA, Holger JENETT
1991 Volume 7 Issue 5 Pages
757-761
Published: October 10, 1991
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The effects of the ion optics of the SNMS (secondary neutral mass spectrometry) INA-3 system on the intensity ratios, from which the relative sensitivity factors can be calculated, have been investigated for several III-V semiconductors: GaAs, GaP, and InP. It was found that the intensity ratios change significantly, depending on the electrode potentials of the ion optics and on the mass difference (
M) between the major constituent elements: within 90% regions of optimum electrode voltages and between
M=6 and 84amu, the maximum total relative deviation of relative intensities increases from about 10% to 250%.
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Tadashi MOCHIZUKI, Akiko SAKASHITA, Hideo IWATA, Yohichi ISHIBASHI, Na ...
1991 Volume 7 Issue 5 Pages
763-766
Published: October 10, 1991
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Inductively coupled plasma mass spectrometry using a laser ablation technique has been developed for the analysis of small inclusions of fused silica. A Q-switched pulsed Nd: YAG laser is fired at interesting sites of sample pieces with sizes of 10-40mm. Ablated particles were introduced directly into the ICP. Preablation with the laser pulses was effective in removing the surface contamination; thus, 1-min preablation could be conducted at interesting sites before data acquisition. The intensity ratios of interesting elements to matrix element with corrections using the relative sensitivity factors obtained by a solution introduction method provide some semi-quantitative data concerning the samples. The established procedure has been applied to the analysis of black inclusions of fused silica. The results have indicated that the major constituent of the inclusions was Fe (oxides).
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Muneyuki KOHRI, Osamu KUJIRAI, Haruno OKOCHI
1991 Volume 7 Issue 5 Pages
767-771
Published: October 10, 1991
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The vanadium matrix in vanadium disilicide and vanadium pentoxide changed to an anionic V(V)-hydrogen peroxide complex before the sample solution was loaded onto the cation exchange resin. Concentrations and volumes of acids for the adsorption, washing and elution of diverse elements were studied. Nitric acid was used as the eluent. Twenty one elements (Al, Be, Bi, Ca, Cd, Co, Cr, Cu, Fe, Ga, In, K, Mg, Mn, Na, Ni, Pb, Sn, Ti, Zn and Zr) were quantitatively adsorbed and eluted. Flame and graphite furnace atomic absorption spectrometry and inductively coupled plasma-atomic emission spectrometry were applied to the determination of impurities after the matrix separation.
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Min HUANG, Zucheng JIANG, Yun'e ZENG
1991 Volume 7 Issue 5 Pages
773-778
Published: October 10, 1991
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A new method based on fluorinating vaporization from a graphite furnace for ICP-AES by using a polytetrafluoroethylene slurry as a fluorinating reagent has been established to determine rare earth elements which are easily formed into refractory carbides. The detection limits were within the range 10
-10 to 10
-12g, and were typically two orders of magnitude better than that obtained with conventional electrothermal vaporization (ETV)-ICP-AES. No memory effect was observed. The relative standard deviation was better than 5%. Some factors which affected fluorinating vaporization are also discussed. It is concluded that ETV-ICP-AES is superior to GFAAS when the carbide-forming elements are determined.
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Hisashi MORIKAWA, Yoshinori UWAMINO, Toshio ISHIZUKA
1991 Volume 7 Issue 5 Pages
779-783
Published: October 10, 1991
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This paper reports a technique for the measurement of insulators by secondary ion mass spectrometry (SIMS). An insulating specimen buried in a circular hole on a conducting disk was measured by using a standard Cameca IMS-3F ion microscope under the normal working conditions with a negatively charged oxygen primary beam. The technique is simple and allows the drastic increase of secondary ion intensity up to three orders of magnitude compared to a conventional specimen mounting. Reproducibility of secondary ion intensity was satisfactory for quantitative analysis.
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Kazunaka ENDO, Ikuo FUJITA, Naoya KOBAYASHI
1991 Volume 7 Issue 5 Pages
785-788
Published: October 10, 1991
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Unsymmetrical fluoran dyes whose coloring-to-decoloring reversible reaction depends upon the acidity are used in heat-Sensitive recording systems. The reversible reaction corresponds to open-to-closed forms of the lactone ring. We observed remarkable chemical shift differences in 4 species of
13C NMR signals between open- and closed-forms of the lactone ring of an unsymmetrical fluoran dye, 3-diethylamino-6-methyl-7-chlorofluoran (DEAMCF) in CDCl
3. According to the optimized molecular structure of DEAMCF by a semi-empirical molecular orbital (MO) Austin Model 1(AM 1) method, the xanthene moiety in colorless form is folded at 166 degree around the C(spiro)-O(xanthene) axis, and the benzolactone moiety is almost perpendicular to the xanthene moiety. The moiety in color form for a molar DEAMCF/H
2SO
4 ratio of 1/2.2 becomes almost planar and has canonical structure, while the lactone ring opens, according to NMR and MO analyses.
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Katsuaki KAMETANI, Kiyoshi IWASHIMA, Shufen JIAO
1991 Volume 7 Issue 5 Pages
789-792
Published: October 10, 1991
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An analytical method for the determination of plutonium in plant materials has been investigated. Plutonium was separated from sample solutions by using two anion-exchange columns. In the first stage, the higher valent plutonium Pu(IV, V, VI) in the sample solution was reduced to trivalent plutonium in the presence of sulfurous acid in a 6M hydrochloric acid solution; the trivalent plutonium was then separated from some metallic ions by using anion-exchange column. Next, the trivalent plutonium was oxidized to quadrivalent plutonium in the presence of hydrogen peroxide in a 9M hydrochloric acid solution; the quadrivalent plutonium was adsorbed on another anion-exchange column. Column was washed with 9M hydrochloric acid, and then with an 8M nitric acid solution; the plutonium on the resin was then eluted with a diluted hydrochloric acid solution containing sulfurous acid. In the final stage, plutonium was electrodeposited on a stainless-steel disk together with the molybdenum carrier. By this method, the recovery rate of plutonium in the sample solution was 97.0±3.4% in seven repeated experiments. In addition, plutonium-238 and plutonium-239+240 in several kinds of herbs imported to Japan from Europe were determined.
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Tadao OKUTANI, Akio SAKURAGAWA, Sachiko KAMIKURA, Mayumi SHIMURA, Shui ...
1991 Volume 7 Issue 5 Pages
793-797
Published: October 10, 1991
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A kinetic method for the spectrophotometric determination of a micro amount of nitrite in natural water was developed with 2, 2′-azinobis(3-ethylbenzothiazoline-6-sulfonic acid) (ABTS) by batchwise and flow-injection techniques. ABTS is oxidized by nitrite in an acidic medium beyond the amounts of stoichiometric completion. The nitrite in each sample was determined by relationship between the absorbance or the peak height and the concentration of standard nitrite solution. By both methods, 10ppb levels of nitrite can be determined. The main drawback of the proposed method involves severe interference due to oxidizing cations. These cations could be effectively removed by the introduction of an ammonium form cation-exchange resin. By using the batchwise method, the relative standard deviation for 10 measurements of 100ppb nitrite was 1.2%. The procedures have been applied successfully to the determination of nitrite in natural water samples, such as rain water.
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Süleyman AKMAN, Hürrem INCE, Ünel KÖKLÜ
1991 Volume 7 Issue 5 Pages
799-802
Published: October 10, 1991
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The preparation and characteristics of thiol-modified silica and its application to the preconcentration and determination of trace amounts of copper and cadmium by flame atomic absorption spectrometry are described. For the preparation of modified silica, the untreated silica suspended in methanol was impregnated with 3-(trimethoxysilyl)-1-propanethiol to obtain thiol-modified silica and the methanol was evaporated under vacuum. The residual silica was dried at 150°C and washed with distilled water until the washings appeared clear. The surface area of thiol-modified silica was 410m
2/g, whereas the copper capacity was about 0.022mmolCu/g silica. Batch and column methods were used for the separation and concentration of the above-mentioned metals. These metals were quantitatively retained on the adsorbent at acidic media. In the batch method, the effects of pH, shaking time and the kind of buffer on adsorption of copper and cadmium were investigated. The shaking time of 30min was sufficient for a quantitative adsorption of the metals. In the column and batch procedures, both copper and cadmium adsorbed on the modified silica were quantitatively recovered with 2M hydrochloric acid. Sodium chloride (up to 1%) had no effects on the recoveries.
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Kazuo UCHIKURA, Makoto KIRISAWA
1991 Volume 7 Issue 5 Pages
803-804
Published: 1991
Released on J-STAGE: July 27, 2007
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Yutaka SAITO, Masaki MIFUNE, Junichi ODO, Yuki OTSUKI, Masanobu MITSUH ...
1991 Volume 7 Issue 5 Pages
805-806
Published: 1991
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Hiroshi AKIYAMA, Toshihiko TOIDA, Toshio IMANARI
1991 Volume 7 Issue 5 Pages
807-809
Published: 1991
Released on J-STAGE: July 27, 2007
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Kenji HAMASE, Hiroshi NAKAMURA, Terumi NAKAJIMA
1991 Volume 7 Issue 5 Pages
811-812
Published: 1991
Released on J-STAGE: July 27, 2007
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Hisashi MATSUDA, Hiroshi NAKAMURA, Terumi NAKAJIMA, Yoshiteru ASAI, Ju ...
1991 Volume 7 Issue 5 Pages
813-814
Published: 1991
Released on J-STAGE: July 27, 2007
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Kenichiro NAKASHIMA, Keiko SUETSUGU, Kazunori YOSHIDA, Kazuhiro IMAI, ...
1991 Volume 7 Issue 5 Pages
815-816
Published: October 10, 1991
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Minoru TANAKA, Takahiro KOBAYASHI, Yuko YAMASHOJI, Yasuhiko SHIBUTANI, ...
1991 Volume 7 Issue 5 Pages
817-818
Published: October 10, 1991
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Keitaro HIROMI, Hiroshi NAKATANI, Akiyoshi TANAKA, Hiroyuki IWAMOTO
1991 Volume 7 Issue 5 Pages
819-821
Published: October 10, 1991
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Naoki FURUTA
1991 Volume 7 Issue 5 Pages
823-826
Published: October 10, 1991
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Masahiko MAEKAWA, Megumu MUNAKATA, Susumu KITAGAWA, Masaki NAKAMURA
1991 Volume 7 Issue 5 Pages
827-828
Published: October 10, 1991
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Masaki KAWANO, Chikara HOSHINO, Ken SAKAI, Kazuko MATSUMOTO
1991 Volume 7 Issue 5 Pages
829-830
Published: October 10, 1991
Released on J-STAGE: June 30, 2006
JOURNAL
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Kumiko MIYAMOTO, Hiroshi SAKAGUCHI, Shin YOSHII, Hiroaki TAKAYANAGI, H ...
1991 Volume 7 Issue 5 Pages
831-832
Published: October 10, 1991
Released on J-STAGE: June 30, 2006
JOURNAL
FREE ACCESS