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Kiyoko TAKAMURA
1993 Volume 9 Issue 5 Pages
571-578
Published: October 10, 1993
Released on J-STAGE: July 04, 2006
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Since 1970, the author has demonstrated the usefulness of the specular reflection method for in situ analysis of adsorbed species on solid electrode/solution interfaces. Although many sophisticated optical techniques have been developed for this purpose in recent years, this method is still valuable for studying adsorption, owing to its sensitivity and specificity for detecting trace amounts of adsorbed species on the electrode surfaces under actual electrochemical conditions. This review is concerned with the application of the specular reflection method to the observation of oxide layer formation, inorganic and organic adsorption phenomena, and surface corrosion on metal electrodes.
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Toshio NAKAMURA, Kyoko MATSUDA, Masayuki TAKAGUCHI, Kosuke IZUTSU
1993 Volume 9 Issue 5 Pages
579-582
Published: October 10, 1993
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The voltammetric behavior of several anions in acetonitrile (AN) was studied at electrodes consisting of polyacrylamide (PAA) coupled to cobalt phthalocyanine (PhCo) and a platinum disk. Well-defined anodic peaks were obtained by cyclic voltammetry for chloride, bromide, iodide, thiocyanate, and tetraphenylborate ions, while fluoride and cyanide ions gave broad peaks. The anodic peak current
versus concentration plots were linear for these anions over a concentration range of 1 to about 10mM. Fluoride and cyanide ions were accumulated in the PAA-PhCo membrane, and the anodic peak current increased with the standing time to give well-defined sharp peaks. The anodic peak processes of chloride, bromide and tetraphenylborate ions were diffusion controlled.
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Fumiyo KUSU, Kouichi YUASA, Kiyoko TAKAMURA
1993 Volume 9 Issue 5 Pages
583-587
Published: October 10, 1993
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The adsorption of quaternary ammonium ions, alcohols and FMN (flavin mononucleotide) on the surface of a glassy carbon electrode was examined by the specular reflection method. Reflectivity on the
R/R0-E curve of the electrode with 0.1mol dm
-3 NaClO
4 decreased gradually with increase in applied potential. This decrease can be explained as due to the formation of chemically adsorbed oxygen. With increase in the molecular size of quaternary ammonium ions and alcohols, decrease in
R/R0 occurs in a progressively wider potential region at lower concentrations. FMN in oxidized form is adsorbed on the glassy carbon electrode. This method is useful for assessing the adsorption of electroinactive and electroactive substances usually present in HPLC samples or mobile phases.
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Tatsuhiko TANAKA, Koichi TSUYUKI, Takashi ISHIYAMA, Gishin TAKIMOTO, A ...
1993 Volume 9 Issue 5 Pages
589-591
Published: October 10, 1993
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Sulfur at the μg g
-1 level in 1-mg steel samples is determined by catholic stripping voltammetry (CSV) with a silver disk electrode, after conversion of the sulfur into hydrogen sulfide followed by its absorption in a 0.2M sodium hydroxide solution. Microscale operations with microliter volumes of solutions are used throughout the entire procedure, except for CSV. Simple apparatus have been devised for a safe treatment with perchloric acid and for the evolution of hydrogen sulfide by reducing with a mixture of hydroiodic and phosphinic acids. The proposed method can be applied to the determination of 60 to 200μg g
-1 of sulfur in steels with an RSD of ca. 5% (
n=3 to 10). The time required for a determination is less than 2.5h.
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Hideki SUGIHARA, Tatsuhiro OKADA, Kazuhisa HIRATANI
1993 Volume 9 Issue 5 Pages
593-597
Published: October 10, 1993
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The preparation of 1, 10-phenanthroline derivatives and 4, 7-diphenyl-1, 10-phenanthroline derivatives as neutral carriers for ion-selective electrodes and the properties of the title electrodes are described in detail. A log
KPotLi, Na value of -3.1 was obtained for a Li
+-selective PVC membrane electrode based on 2, 9-dibutyl-1, 10-phenanthroline. This value is superior to those reported so far. The electrodes also showed excellent selectivity coefficients for Li
+ relative to K
+, Mg
2+, and Ca
2+ The effects of substituents at the 2- and 9- positions of the carriers on the selectivity are discussed.
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Akinori JYO, Rudolf WEBER, Hiroaki EGAWA
1993 Volume 9 Issue 5 Pages
599-603
Published: October 10, 1993
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An anion adsorbent was developed based on a Cobalt(III)-loaded chelating resin containing 1, 4, 8, 11-tetraazacyclo-tetradecane-5, 7-dione. Batchwise adsorption study has revealed that the adsorbent exhibits an anti-Hofmeister anion selectivity sequence (OH
->SCN
->NO
2-) and that it takes up thiocyanate preferentially in the presence of excess perchlorate as well. Column-mode study has also clarified that the adsorbent takes up thiocyanate preferentially even in the presence of tenfold excess perchlorate. The adsorbed thiocyanate is rapidly and quantitatively eluted with 0.2M sodium hydroxide, unlike to the case of a conventional anion exchange resin (Bio-Rad AG 1-X4) column. In addition, the adsorbent was able to be regenerated with hydrochloric acid solution for repeated use. During repeated use of the adsorbent for a half year, no loss of the loaded cobalt(III) was observed.
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Kikuo TAKATERA, Tadashi WATANABE
1993 Volume 9 Issue 5 Pages
605-609
Published: October 10, 1993
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The induction of metallothionein (MT) in a cyanobacterium Anacystis nidulans R-2 through the uptake of Zn
2+, Cd2
+ and Hg
2+ was studied by high-performance liquid chromatography (HPLC) with inductively coupled plasma mass-Spectrometric (ICP/MS) detection, under optimized temperature and light conditions for MT biosynthesis. MT was induced immediately after the individual addition of the three metal ions (5μM); its maximum level was reached in 48h (Zn and Cd) or 16h (Hg). Although separate dosing of Cd
2+ (5μM) and Zn
2+ (5μM) gave MTs with comparable amounts of the metal incorporated, their simultaneous dosing yielded a MT with a Cd : Zn molar ratio of 2:1. A more pronounced effect was noted for Hg
2+ in going from single Zn-dosing to simultaneous Hg-plus-Zn dosing. These results suggest that the coexistence of Cd
2+ or Hg
2+ suppresses the incorporation of Zn
2+ into the MT, probably due to inhibition of the uptake of Zn into the organism. The much higher effect of Hg
2+ than Cd
2+ is in line with the order of the metal affinity to sulfhydryl (SH) groups, Hg
2+>Cd
2+>Zn
2+.
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Hideyuki NISHIZAWA, Kayoko TAHARA, Aiko HAYASHIDA, Yoshihiro ABE
1993 Volume 9 Issue 5 Pages
611-615
Published: October 10, 1993
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Continuous enantioseparation of (±)-mandelic acid was performed by dual-flow countercurrent extraction. The optimum extraction condition was calculated by a semi-empirical computational method. Use of the two-phase system composed of a 0.2mM copper(II) acetate aqueous solution and butanol containing 10mM
N-dodecyl-L-proline copper(II) complex as a chiral separator allowed (±)-mandelic acid to be separated continuously. HPLC analysis showed that the (-)-form was extracted into the organic phase and the (+)-form was recovered from the aqueous extract with ee higher than 99.9%, at the stationary state.
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Hiroyuki UKEDA, Toshinao ISHII, Masayoshi SAWAMURA, Hirozo KUSUNOSE
1993 Volume 9 Issue 5 Pages
617-623
Published: October 10, 1993
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A solution of bovine serum albumin (BSA) was repeatedly injected into a column packed with EAH-Sepharose activated with glutaraldehyde (GA-activated Sepharose) at appropriate time intervals. The experimental elution profile of BSA from the column was analyzed by a model based on the assumption that BSA is bound to GA-activated Sepharose in two different modes. The mode having higher binding rate constant was attributed to an ionic interaction and the mode having lower rate constant was attributed to an aldehyde group on GA-activated Sepharose. These modes are distinguished in accordance with the effect of the ionic strength and pH of the carrier solution on the binding parameters of BSA. When the carrier solution had a lower ionic strength, the ionic interaction was a driving force for the binding of BSA. Once BSA was retained on the support by the interaction, BSA was subsequently bound to it more tightly by a bonding
via an aldehyde group of GA-activated Sepharose. When a carrier solution containing 100mM NaCl was used, the ionic interaction was remarkably lowered. The pH 8 suitable for the formation of the binding
via an aldehyde group gave a maximum amount in the dynamic binding process of BSA.
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Naoto MUKAIDA, Norio KAWAI, Yoshiaki ONOUE, Yasuharu NISHIKAWA
1993 Volume 9 Issue 5 Pages
625-629
Published: October 10, 1993
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Protochlorophylls of inner seed coats of pumpkin were analyzed by three-dimensional reversed phase high-performance liquid chromatography. Three types of precursors, 2, 4-divinyl-protochlorophyll
a, 2, 4-divinyl-protopheophytin
a and 2-vinyl-protopheophytin
a, were identified. Each could be subdivided into three species based on the variety of the esterifying alcohol moiety, namely tetrahydrogeranyl geraniol, dihydrogeranyl geraniol or geranyl geraniol. The phytol ester of divinyl-protopheophytin
a was also detected. These precursors were simultaneously identified on the three-dimensional chromatogram.
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Michihiro FUKUSHIMA, Masuo NAKANO, Tsuyoshi ENDO, Takashi NEGISHI
1993 Volume 9 Issue 5 Pages
631-635
Published: October 10, 1993
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A thermospray high-performance liquid chromatography-mass spectrometry (TSP HPLC-MS) method is described for the analysis of prostaglandins (PGs) E
1 and E
2, which have several physiological actions at the trace level. HPLC separation was carried out on a reversed-phase column by using 50mM ammonium acetate (pH 4.5)-acetonitrile (7:3, v/v) as the mobile phase at a flow rate of 1.0ml/min. In MS detection, the vaporizer temperature was set at 220°C and the ion-source block temperature at 264°C. The mass spectra obtained from PGs typically exhibited the [M+NH
4]
+ ion (5 to 30% relative intensity) and several fragment ions due to sequential losses of water from both the [M+H]
+ and [M+NH
4]
+ ions. PGE
1 (46.9ppb) and PGE
2 (1.9ppb) in the colostrum of dairy cattle were identified and quantitated. The PGE
1 concentration in the colostrum and mature milk of dairy cattle showed a similar pattern to that in humans.
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Takaho WATANABE, Yoshiko KIMURA, Yoshihiro YOSHIMURA, Katsumi UCHIYAMA ...
1993 Volume 9 Issue 5 Pages
637-640
Published: October 10, 1993
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To evaluate the damage to human hair by treatment with chlorine oxides, the mercapto (SH) groups in human hair were measured spectrophotometrically without dissolving the hair. The procedure used the reaction of 2, 2′-dithiodipyridine with a thiol giving the corresponding 2-thiopyridone, which is quantitated by measuring the absorbance at 343nm. By incubating human hair in a solution containing 2, 2′-dithiodipyridine at 60°C for 90min, a linear relationship was found between the concentration of hair and the absorbance of 2-thiopyridone, with a relative standard deviation of 6.3%. Hypochlorite decreased the concentration of SH groups in hair, while other chlorine oxides exhibited little effect.
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Toshiyuki SUZAWA, Yoshihito IKARIYAMA, Masuo AIZAWA
1993 Volume 9 Issue 5 Pages
641-646
Published: October 10, 1993
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An effective combination of enzymatic amplification with sensitive detection will improve the sensitivity of solid-phase immunoassay. A series of approaches toward inactivating nonspecific binding sites was developed to minimize the surface active sites of solid-phase matrices. For minimizing the surface active sites, which are responsible for nonspecific binding, surfaces were coated with a lipid layer and a protein membrane, and the effects of these blocking agents were evaluated. These membranes were prepared by the Langmuir-Blodgett method, and then compared with the membranes prepared by physical adsorption. Among the membranes investigated, a thin membrane of skimmed milk was best-suited for decreasing undesired adsorption of enzyme-labeled antibodies. Here, alkaline phosphatase was exploited as an enzyme amplifier whose product, p-nitrophenol, was easily determined either spectrophotometrically or electrochemically. The detection limit for mouse IgG was 10
-11g/ml in the case of spectrophotometric detection; in the case of electrochemical method, mouse IgG as low as 10
-12g/ml was determined when nitrophenol was detected electrochemically.
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Osamu IMAKYURE, Masaaki KAI, Tetsuya MITSUI, Hitoshi NOHTA, Yosuke OHK ...
1993 Volume 9 Issue 5 Pages
647-652
Published: October 10, 1993
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Two Edman-type fluorogenic reagents, 3- and 4-(2-phenanthra[9′, 10′-d]oxazolyl)phenylisothiocyanates, were synthesized. The reaction conditions of amino acids with these reagents were investigated for the high-performance liquid chromatographic determination of amino acids. Both reagents reacted with the tested 21 amino acids in basic medium to form the corresponding coupled derivatives in good yields. These products were converted in an acidic medium to the thiohydantoin derivatives. The derivatives were separated by reversed phase chromatography with fluorescence detection. The detection limits of amino acids (
S/N=3) were pico- or subpicomole level on column.
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Yoshihiko IKEGUCHI, Hiroshi NAKAMURA, Terumi NAKAJIMA
1993 Volume 9 Issue 5 Pages
653-655
Published: October 10, 1993
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An organic phosphates analyzer was developed based on high-performance anion-exchange chromatography and a postcolumn phosphomolybdic acid reaction. The organic phosphates were separated on an Asahipak NH2P-50 column and then introduced into a postcolumn reaction detector in which organic phosphates were heated at 170°C in 2.0M sulfuric acid for 5.8min. The resultant orthophosphate was monitored at 830nm after a selective reaction with a molybdenum reagent. When 1.0nmol of each sugar phosphate solution was employed (injection volumn, 10μl) the relative standard deviations were 1.9-2.6% (
n=8). The detection limits (
S/N=3) of the organic phosphates were ca. 100pmol as the injected amount.
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Sri Juari SANTOSA, Noriyuki SATO, Shigeru TANAKA
1993 Volume 9 Issue 5 Pages
657-662
Published: October 10, 1993
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A sensitive method for the selective determination of selenium(IV) and selenium(VI) in natural water using reversed-phase high-performance liquid chromatography with a spectrofluorometric detector has been developed. Selenium(IV) in 50ml of a natural-water sample was determined spectrofluorometrically after complexing with 2, 3-diaminonaphthalene (DAN) at a pH of 1, extracting the complex into 1ml of cyclohexane and injecting a 100-μl portion of the extract into a UNISIL ODS 5C18 column along with a mixture of cyclohexane and tetrahydrofuran (90/10, v/v) as a mobile phase. Selenium(VI) in the sample was first reduced to selenium(IV) at a temperature of 80°C for 60min with 2% (w/v) potassium bromide and 20μg/ml copper(II) in a 1.2M hydrochloric acid solution. The total inorganic selenium was then determined by the same treatment as mentioned for selenium(IV). The concentration of selenium(VI) was obtained by subtracting that of selenium(IV) from the total amount of selenium. For the purpose of eliminating interference, 2ml of a 0.1M EDTA-NaF solution was added to each sample. Absolute detection limits as high as 0.2ng and 0.3ng, respectively, were achieved for selenium(IV) and selemium(VI). For the determination of selenium in Tama river-water samples, the method gives average amounts for selenium(IV) and selenium(VI) as high as 25 and 127ng/l.
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Kuniyuki KITAGAWA, Yasutada SHIMAZAKI
1993 Volume 9 Issue 5 Pages
663-669
Published: October 10, 1993
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A new type of atomic absorption spectrometer was developed for simultaneous determinations of up to 10 elements. The radiation from several hollow cathode lamps strikes a plane grating at different incident angles, which were set so that the rays of the analytical line from the hollow cathode lamps will merge into a single beam. The incident angles were calculated from the grating equation. The discharge currents of the hollow cathode lamps were sinusoidally modulated at different frequencies. The atomic absorption signals from a photomultiplier tube (PMT) were discriminated through fast Fourier transformation (FFT). The analytical performances were evaluated for simultaneous determinations of up to 10 elements in test solutions and in mandarin orange juice by means of electrothermal atomization.
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Minoru ARAI
1993 Volume 9 Issue 5 Pages
671-673
Published: October 10, 1993
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Atomic absorption spectrometry (AAS) and inductively coupled plasma spectrometry (ICP) were applied to analyses of the ash content in particulates emitted from a diesel engine. Particulate samples were decomposed and dissolved by sulfuric acid, nitric acid, aqua regia, hydrochloric acid and hydrogen peroxide. The objective components in ash (calcium, zinc and phosphorus) originating from lubricant additives were determined in order to evaluate the quantity of lubrication oil consumption. ICP was used for the determination of phosphorus because AAS does not have sufficient sensitivity for the component in ash. The calculated values based on these analytical methods showed the same level as the real lubrication oil consumption, and the results were effective for the quantification of lubrication oil consumption, even though the engine operating time was minimized to about one tenth of the conventional weight-change method.
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Andrew J. WALDER, Naoki FURUTA
1993 Volume 9 Issue 5 Pages
675-680
Published: October 10, 1993
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An inductively coupled plasma (ICP) ion source coupled to a magnetic sector mass analyser equipped with seven Faraday detectors has been used to measure the lead isotope ratios in solutions of Sanshiro Pond sediment collected at the University of Tokyo, airborne particulates collected at Shinjuku in Tokyo and Merck multielement standard product number 97279494. A thallium correction technique was utilised to allow a simultaneous correction for mass bias. This work followed an earlier interlaboratory comparison study of the above-mentioned solutions using ICP quadrupole mass spectrometry, and has demonstrated a considerable improvement in analytical precision. The following isotope ratio measurements were recorded. Pond sediment solution containing 82ng ml
-1 lead:
206Pb/
204Pb=17.762±0.014;
206Pb/
207Pb=1.1424±0.0009;
208Pb/
204Pb=37.678±0.034. Airborne particulate solution containing 45 ng ml
-1 lead:
206Pb/
204Pb=17.969±0.006;
206Pb/
207Pb=1.1528±0.0003;
208Pb/
204Pb=37.915±0.021. Merck multielement standard solution containing 100ng ml
-1 lead:
206Pb/
204Pb=19.255±0.015;
206Pb/
207Pb=1.2238±0.0004;
208Pb/
204Pb=38.476±0.021 (All errors are given as ±2 standard deviations).
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H. N. ELSHEIMER
1993 Volume 9 Issue 5 Pages
681-685
Published: October 10, 1993
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A fusion-extraction procedure for the determination of total tin in rocks and sediments by graphite furnace atomic absorption spectrometry (GFAAS) was reexamined and modified to obtain the optimum accuracy and precision. Several variations based on increases in the sample weight or extraction ratio were compared based on the determination of tin in 18 Geological Survey of Japan (GSJ) reference materials. The most accurate and precise procedure was found to be an 8:1 extraction of a 0.5g rock sample fused with lithium metaborate and dissolved in 7.5% hydrochloric acid, using a 4% solution of trioctylphosphine oxide in methyl isobutyl ketone (TOPO-MIBK). Rocks containing <1μg/g total tin require a 0.5g sample size for the utmost accuracy. Utilizing these modifications, tin concentrations were found to be within 0.1μg/g for all of the GSJ reference standards with the exception of the rhyolites. Values are reported for the total tin content of three new GSJ reference materials, namely, JLk-1, JLs-1, and JDo-1.
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A. M. KIWAN, G. A. WANAS, F. M. HASSAN
1993 Volume 9 Issue 5 Pages
687-690
Published: October 10, 1993
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1, 5-Bis(3, 4, 5-trimethoxyphenyl)- and 1, 5-bis(2-methoxy-4-methylphenyl)-3-mercaptoformazans have been prepared and characterized, and their reactions with metal ions in a two-phase system are reported. The extraction equilibria of their metal complexes with Cd
II, Co
II, Cu
II, Hg
II, Ni
II, Pb
II, Tl
I and Zn
II as well as their spectral characteristics are also described. The molar absorptivities of Pb
II and Zn
II complexes with 1, 5-Bis(3, 4, 5-trimethoxyphenyl)-3-mercaptoformazan are higher than the corresponding values of their complexes with dithizone. The molar absorptivities of Cu
II and Cd
II complexes with 1, 5-bis(2-methoxy-4-methylphenyl)-3-mercaptoformazan are also higher than the corresponding values of the dithizone complexes. 1, 5-Bis(2-methoxy-4-methylphenyl)-3-mercaptoformazan is more efficient than dithizone in the separation of Cd
II from Zn
II.
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Motoho MUROI, Eiichi SEKIDO
1993 Volume 9 Issue 5 Pages
691-694
Published: October 10, 1993
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A bisthiacrown compound bearing two chromogenic groups, which can function as a counter anion, was synthesized. Its characteristics as an extractive-spectrophotometric reagent for the soft bivalent metal ions were examined and compared with those of a mono-type thiacrown compound. The soft univalent metal ions such as silver(I) and copper(I) were well extracted. The soft bivalent metal ions, cadmium(II) and mercury(II), were also well extracted with this bis-type reagent. Accordingly, the extraction behavior was different from that of the mono-type thiacrown compound. Cobalt(II), nickel(II) and zinc(II) were not significantly extracted, but copper(II) was appreciably extracted with this reagent. Of the five metal ions extracted with this bis-type reagent, cadmium(II) and copper(II) complexes in organic solvents exhibit an absorption maximum at similar wavelengths, but at considerably shorter wavelengths than copper(I), silver(I) or mercury(II).
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Shigenori NAKANO, Mikio HAYASHI, Takuji KAWASHIMA
1993 Volume 9 Issue 5 Pages
695-699
Published: October 10, 1993
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The effect of several buffers was examined for the catalysis of copper(II) in the reaction of
N, N-dimethyl-p-phenylenediamine with
N, N-dimethylaniline to form Bindschedler′s Green (λ
max=725nm) in the presence of hydrogen peroxide. The buffer agents which were examined included imidazole, 2, 4, 6-trimethylpyridine (TMP), piperazine-N, N′-bis(2-ethanesulfonic acid) (PIPES),
N, N-bis(2-hydroxyethyl)-2-aminoethanesulfonic acid (BES), 3-(
N-morpholino)-propanesulfonic acid (MOPS), and
N-2-hydroxyethylpiperazine-N′-2-ethanesulfonic acid (HEPES). Among them TMP was found to be the most favorable agent in this reaction system. The established catalytic method is given for the 0.05-1.0ng cm
-3 range of copper(II), and has an effective sensitivity index of 1.1×10
-3ng cm
-2.
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Shuko FUJIEDA, Rimiko UCHIDA, Rimiko UCHIDA
1993 Volume 9 Issue 5 Pages
701-706
Published: October 10, 1993
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The melting peak in differential scanning calorimetry, DSC, has no symmetry, so the common separation techniques of overlapped peaks may not be applied. The melting peak of indium measured by heat-flux type of DSC was used as a model peak. The doubly overlapped sample peaks differing in each peak parameter: position P, height
H and width W were prepared from the model peaks. Therefore, six variables were determined by a modified simplex optimization method. For diminishing the run time, an effective execution of the peak separation was considered. Peak area S was also involved for the calculation of
H. Random noises from 0.5% to 2% were added to every data point of the sample peaks, and the overlapped peaks were separated by the proposed algorithm. The discrepancy in base lines before and after the peak was taken into consideration. Fairly good results were obtained for P and reasonable ones for
H, W and S.
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Hui LI, Benling GONG, Toru OCHIAI, Kazuko MATSUMOTO
1993 Volume 9 Issue 5 Pages
707-709
Published: 1993
Released on J-STAGE: July 27, 2007
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Hirotaka IHARA, Takanori FUKUMOTO, Chuichi HIRAYAMA
1993 Volume 9 Issue 5 Pages
711-713
Published: 1993
Released on J-STAGE: July 27, 2007
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Shinji YOSHIYAGAWA, Koji TOHDA, Yoshio UMEZAWA, Satoshi HASHIMOTO, Mas ...
1993 Volume 9 Issue 5 Pages
715-718
Published: 1993
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Yasuyuki MIURA, Tomozo KOH
1993 Volume 9 Issue 5 Pages
719-721
Published: October 10, 1993
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Benling GONG, Hui LI, Toru OCHIAI, Lin Tie ZHENG, Kazuko MATSUMOTO
1993 Volume 9 Issue 5 Pages
723-726
Published: October 10, 1993
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Tadahiro FUKAYA, Minoru TAKEYA, Yasumasa SAYAMA
1993 Volume 9 Issue 5 Pages
727-729
Published: October 10, 1993
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Tadao OKUTANI, Kazuto YAMAKAWA, Akio SAKURAGAWA, Ryozoh GOTOH
1993 Volume 9 Issue 5 Pages
731-734
Published: October 10, 1993
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Shoji KOZUKA, Masaru HAYASHI, Hideki MATSUNAGA
1993 Volume 9 Issue 5 Pages
735-736
Published: October 10, 1993
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Tetsuya ASHINO, Kunio TAKADA
1993 Volume 9 Issue 5 Pages
737-739
Published: October 10, 1993
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Crystal Structure of Exo-(5R*, 6R*, 11S*, 12S*)-5, 6, 11, 12-tetrahydro-4, 11, 12-trimethoxy-9, 13, 13-trimethyl-5-[(triethylsilyl)oxy]-6, 10-methano-8(7H)benzocyclodecenone
Sachiyo KAMEI, Yasuyuki TAKENAKA, Yoshii SAKAI, Yuji OHASHI, Masaki SE ...
1993 Volume 9 Issue 5 Pages
741-742
Published: October 10, 1993
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Nobuya NAGASHIMA, Shin'ichi KISHIMOTO, Toshiya TANABE, Yoichi IITAKA
1993 Volume 9 Issue 5 Pages
743-745
Published: October 10, 1993
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Sachiyo KAMEI, Yasuyuki TAKENAKA, Yoshii SAKAI, Yuji OHASHI, Tsuyoshi ...
1993 Volume 9 Issue 5 Pages
747-748
Published: October 10, 1993
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