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Volume 20, Issue 1
Displaying 1-23 of 23 articles from this issue
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Conductimetric titration of Lewis acids with carboxylic acids in nonaqueous mediaChozo YOSHIMURA, Kunihiko TAMURA1971 Volume 20 Issue 1 Pages 3-7
Published: January 05, 1971
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSConductimetric titration of Lewis acids which were thought to form adducts with DMF (GeCl4, SnCl4, PbCl2, TiCl4, ZrCl4, AsCl3, and SbCl5) with carboxylic acids in N, N-dimethylformamide (DMF) was studied.
The DMF solutions of aminocarboxylic acids (EDTA, NTA) and carboxylic acids (oxalic, benzoic etc.) were used as the titrant, and the titration curves gave various reactive ratios as follows; SbCl5 : EDTA=4 : 1, 2 : 1, 1 : 1, 2 :3 and 1 : 2, GeCl4, C6H5COOH=1 : 1, 1 : 2, 1 : 3 and 1: 4, TiCl4 : NTA=3 : 1, 2 : 1 and 1: 1, and ZrCl4 : HCOOH=1 : 1, 1: 2, 1: 3 and 1: 4.
Formulas of addition compounds between Lewis acids and DMF were proposed as SbCl5DMF, TiCl4DMF etc. by S. J. Kuhn {Can. J. Chem., 43, 375 (1965)} by NMR experiments, and the conductimetric results supported these formulas.
Less than 20% of water gave no influence on the reactive ratios.View full abstractDownload PDF (742K) -
Analysis using fluotitanic acid hydrogenperoxide reagent. XIVHisao FUKAMAUCHI, Chiyo MATSUBARA, Noriko TAMAKI1971 Volume 20 Issue 1 Pages 8-11
Published: January 05, 1971
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSIron in samples containing several elements which showed the color of pertitanic acid by adding a mixture of fluotitanic acid and hydrogen peroxide (the coloring reagent) was determined by transmittanceratio method. The iron in a sample solution of about 5 N hydrochloric acid was extracted with ether and a known quantity of iron (III) and the coloring reagent were added to the residual solution. Against this colored solution was measured the transmittance of the original sample solution colored by the coloring reagent, by transmittance-ratio method. Basic experiments using artificially prepared solutions were worked out. Several samples of silicate minerals containing 208% iron were then analyzed and results with differences of less than about +1.5% comparing with thcse by the gravimctric method were obtained. The time required for one determination was less than one-fourth of that for the gravimetric method.View full abstractDownload PDF (786K) -
Tatuo TAKAHASHI, Takefumi KOISO1971 Volume 20 Issue 1 Pages 11-16
Published: January 05, 1971
Released on J-STAGE: February 16, 2010
JOURNAL FREE ACCESSA spectrophotometric investigation was made on the complexes formed between 1-(2-pyridylazo)-2-naphthol(PAN) and zinc(II) in 20vol% dioxane solution. As to their complex compositions, it was found that the molar ratio of zinc(II) and PAN was 1 : 1 and 1 : 2 in the solution of pH 4?6, while molar absorption coefficient was 2.5 × 104 at 540 mμ.
The equilibrium constant for the reaction, HA + Zn(II)_??_ZnA++H+, was 2.5 × 10-2 and the stability constant for the complex(1 : 1) was approximately 4.0 × 1010. The theoretical error in the titration of zinc(II) with ethylenediaminetetraacetic acid(EDTA) using PAN as an indicator was calculated from the stability constant of the complex obtained, and the optimum pH range for the titration was discussed.View full abstractDownload PDF (997K) -
Sueo NISHI, Yoshiyuki HORIMOTO1971 Volume 20 Issue 1 Pages 16-20
Published: January 05, 1971
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSA method for the identification of methyl-, ethyl-or phenyl-mercuric compounds of RHgX type by gas chromatographic peak subtraction was studied. The gas chromatographic peaks of RHgX compounds were subtracted by treating the sample solutions before introduction to a gas chromatograph with (a) aqueous solutions of organic thio-compounds, e.g. glutathione, sodium thioglycolic acid, sodium thiosalicylic acid, thiomalic acid, thioglycerole and thiourea, (b) metal sulfides or thiosulfate, e.g. Na2S, CuS, ZnS and Na2S2O3, and (c) metal powders, e.g. Fe, Ni, Al, Zn and Pb in presence of water. The peak subtraction occurred also by inserting a short column of metal powders between chromatographic column and detector.
The peak subtraction by these treatments is specific for RHgX compounds and, by combining each of them, offers a highly reliable method of confirmation of RHgX compounds.View full abstractDownload PDF (899K) -
Tsugio KOJIMA, Mitsunojo ICHISE, Yoshimitsu SEO1971 Volume 20 Issue 1 Pages 20-28
Published: January 05, 1971
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSThe design and performance of a simple, sensitive and selective gas-chromatographic detector have been described. The operation of the detector is based on the continuous monitoring of hydrogen sulfide and hydrogen chloride absorbed in an alkaline solution by means of ion-selective electrodes without interference from other common elements.
Components in samples are separated on a GLC column by using hydrogen as carrier gas. The individual components are heated in the atmosphere of carrier gas over nickel or platinum catalyst until their pyrolysis are complete.
Under these conditions, sulfur and chlorine compounds are converted quantitatively to hydrogen sulfide and hydrogen chloride, respectively. These gases are picked up by a slow stream of an alkaline solution. Sulfide or chloride ion concentration in the resulting solution is monitored in the flow cell with ion-selective electrode.
The potentiometric output of the cell is converted to the signal, which is proportional to the concentration of sulfide or chloride ion, by an antilogarithm converter and recorded.
The response of the detector to sulfur-containing compounds was about 2000 times that to an equal quantity of other organic compounds, and 10-10 moles of dimethyl disulfide could be detected at a signal-to-noise ratio of 2. The response was linear for 2×10-101×10-7 moles of dimethyl disulfide and for 1×10-81×10-6 moles of 1, 2-dichloroethane.View full abstractDownload PDF (1516K) -
Kyong-Hun KIM, Saichi KATAYAMA1971 Volume 20 Issue 1 Pages 29-36
Published: January 05, 1971
Released on J-STAGE: February 16, 2010
JOURNAL FREE ACCESSMathematical treatment for correcting the effect in quantitative X-ray spectrochemical analysis is carried out to study the relationship between the X-ray fluorescent patterns and composition of element of (Bi1-xSbx)2(Te1-ySey)3 system. The samples, which are prepared as standard, consist of four elements in the following concentration in weight percent; bismuth (063.46), antimony (050.33), tellurium (061.47) and selenium (049.67).
The parameter for absorption-excitation effects can be expressed in terms of empirical parameters relating to the pairs of elements used. The standard deviations (errors) and coefficients of variance in simultaneous equation method are respectively, as the followings; that is in α-line values: ±1.15% and ±4.3%, and in β-line values: ±0.9% and ±3.7%.View full abstractDownload PDF (1180K) -
Studies on the metal-nucleotides complexes. IIMichiyuki OGAWA, Yukiko URATA, Takeichi SAKAGUCHI1971 Volume 20 Issue 1 Pages 36-40
Published: January 05, 1971
Released on J-STAGE: February 16, 2010
JOURNAL FREE ACCESSA crystalline precipitate of Cu(II)-5'-adenylic acid (5'-AMP) was isolated from the solution of pH 4.04.5 by heating at 40°C. An elementary analysis showed that it had a composition of [(C10H12N5O7P)Cu(H2O)].Chemical structure of this complex was discussed by infrared absorption spectra in comparison with those of 5'-AMP and 5'-AMP-2Na. Shift of C=N+ of 1690 cm-1 to 1660 cm-1 and a little change in the band at 1100 cm-1 (phosphate groups) upon complexation showed that N1 of adenine ring moiety and also phos-phate group of 5'-AMP are the site of coordination. Existence of the coordination bonding between Cu(II) and N1 of adenine ring moiety was confirmed by the fact that N1-methyl-5'-AMP did not form insoluble Cu(II) complex in an acid solution. Additional experiments to get insoluble Cu(II) complexes of ADP and ATP in the same condition as 5'-AMP did not succeed. Separation of 5'-AMP from other adenine nucleotides may be possible by the use of the complexation with Cu(II).View full abstractDownload PDF (698K) -
Takeichi SAKAGUCHI, Shinzo TANABE, Urao NONAKA1971 Volume 20 Issue 1 Pages 41-48
Published: January 05, 1971
Released on J-STAGE: February 16, 2010
JOURNAL FREE ACCESSComparison of Voges-Proskauer reaction between the colored solution with diacetyl-guanidino compounds system (O'Meara's method) and diacetyl-guanidino compounds-α-naphthol system (Eggleton's method) were studied by visible absorption spectra, using such guanidino compounds as creatine, 1, 1-dimethylguanidine and 1, 1-pentamethyleneguanidine.
O'Meara's method was performed in the concentrated alkaline solution or in the similar diluted alkaline solution as in Eggleton's method.
And following results were obtained;
(1) We found absorption maxima of the colored solution by O'Meara's method of three guanidino compounds to have 520, 515 and 515 mμ, respectively.
And the same peak of 405 mμ was commonly observed in the diluted alkaline solution by O'Meara's method with each guanidino compounds, besides the range of 500 mμ.
(2) Color intensities of the colored solutions at 405 mμ and 500 mμ region by O'Meara's method were dependent on the concentration of alkali.
(3) By Eggleton's method, however, color intensities were dependent on the concentration of α-naphthol.
(4) In comparison of the colored solutions with absorption spectra and reaction processes, it was indicated that the colored substances by Eggleton's and O'Meara's method might be different from each other.
(5) The limit of colorimetric determination of diacetyl by V-P reaction were as follows.
Eggleton's method with 1, 1-pentamethylenegua-nidine was 0.01 μmol/ml and O'Meara's method with creatine was 0.1 μmol/ml.View full abstractDownload PDF (1228K) -
Shoji BANDO, Tsuyoshi IMAHASHI1971 Volume 20 Issue 1 Pages 49-56
Published: January 05, 1971
Released on J-STAGE: February 16, 2010
JOURNAL FREE ACCESSA method of neutron activation analysis has been developed for the determination of trace amounts of scandium, chromium, iron, cobalt, zinc, and antimony as the long-lived nuclide in the deposits and airborne particulates. Collected samples in sealed quartz tubes were irradiated for 200 hours in a JRR-2 reactor (thermal neutron flux : 4× 1013 n/cm2·sec) and were analyzed either by the non-destructive method which used Ge(Li) detector or the chemical separation method which used anion exchange separation followed by extraction with TTA-benzene and DDTC-carbon tetrachloride. The two results were in good agreement. Consequently, the non-destructive method with Ge(Li) detector was recommended as an efficient means for analyzing many samples of deposits and airborne particulates at a time with high sensitivity.View full abstractDownload PDF (1108K) -
Katsumi YAMAMOTO, Kousabro OHASHI, Atsushi ONUMA1971 Volume 20 Issue 1 Pages 57-61
Published: January 05, 1971
Released on J-STAGE: February 16, 2010
JOURNAL FREE ACCESSIt has been related hitherto that tervalent chromium reacts very slowly with EDTA and sexivalent chromium does not react with it.
The authors have found that, if tervalent chromium is newly prepared by reducing sexivalent chromium with a suitable reducing agent, it reacts rapidly with EDTA and subsequently forms Cr(III)-EDTA complex which shows absorption peaks at 395 mμ and 550 mμ. The isosbestic point appears at 494 mμ in absorption curves of the Cr(III)-EDTA chelate system.
Beer's law was obeyed on the absorbance of Cr(III)-EDTA formed in the range of concentration from 2.00 × 10-4 to 2.25 × 10-3 mol of reducing agent. Consequently, reducing agents such as ascorbic acid, hydroquinone, sulfite and thiosulfate can be determined indirectly by measuring absorbance at 550 mμ at pH 3.5.
It is considered that the very slow reaction of Cr3+ with polyaminocarboxylic acids is due to the slow rate of exchange reaction of water molecules coordinated to chromium ion, which makes it reasonable that the newly reduced tervalent chromium ion reacts rapidly with EDTA.View full abstractDownload PDF (666K) -
Isao TAKEMURA1971 Volume 20 Issue 1 Pages 61-64
Published: January 05, 1971
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSTrimethylsilyl(TMS)-derivatives of fifteen synthetic preservatives and seven synthetic antioxidants were determined by a gas-liquid chromatography. By using n-hexadecane as an internal standard the relative retention values of TMS-derivatives were measured on the following six columns: 20% Apiezon L, 20% Silicone SE-31, 20% Silicone DC-550, 20% Ucon Oil 50-HB-280X, 20% Carbowax 20 M and 15% Polydiethyleneglycolsuccinate each coating 60/80 Celite 545. The non-polar columns, i.e. Apiezon L and Silicone SE-31, were better than the polar columns for complete separation of TMS-derivatives. On the polar columns, the tailing of peaks were remarkable and some ingredients could not be detected.
A method was proposed for the determination of alkyl-4-hydroxylbenzoates in soy sauce by using a column of 20% Silicone SE-31 on 60/80 Celite 545 and the calibration curves for the assay were obtained. The recoveries of methyl-and n-propyl-4-hydroxylbenzoates were, respectively, 99.9% and 100.4% with standard deviation of 1.5% and 2.1%.View full abstractDownload PDF (584K) -
Hitoshi KOHARA, Nobuhiko ISHIBASHI1971 Volume 20 Issue 1 Pages 65-69
Published: January 05, 1971
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSExtractive equilibrium constants of organic anions and organic ligands have been estimated, and several factors governing the extractability of organic anions with quaternary ammonium chloride have been investigated.
Sulfonate ion is more extractable than carboxylate ion among the functional groups used for the extraction of organic anions. Extractability of the organic anions containing sulfonic group increases in the order, benzenesulfonate<naphthalene-2-sulfonate <anthraquinone-2-sulfonate. Anionic sizes concern with hydrophobicity, and extractive equilibrium constant increases as the organic character of extracting species increases. The existence of hydrophilic groups such as hydroxyl group reduces the extractability of those anions and organic ligands. The following values of extractive equilibrium constants, logKA-Cl-, for the extraction of organic anions by quaternary ammonium chloride are obtained: naphthalene-2-sulfonate, 3.90; 1-naphthol-4-sulfonate, 2.59; 2, 3-dihydroxynaphthalene-6-sulfonate, 1.81. Alizarin Red S, in spite of an existence of hydroxyl groups in it, is easily extracted into organic solvents by an occurrence of aggregation of the ligands in the organic phase. The selectivity of organic anion for chloride ion has a tendency to increase with a decrease of polarity in solvent molecule, but it is reduced in chloroform by the formation of hydrogen bond between solvent molecules and chloride ion.View full abstractDownload PDF (818K) -
Matsuji SATO, Hiroshi MATSUI, Tadao MATSUBARA1971 Volume 20 Issue 1 Pages 70-78
Published: January 05, 1971
Released on J-STAGE: February 16, 2010
JOURNAL FREE ACCESSAnalysis by X-ray excited optical luminescence was applied to the determination of trace amounts of rare earths as impurities in yttrium and gadolinium oxides. In order to establish fundamental conditions, studies were made on the method of purification of base materials, the effects of temperature and time of ignition of test specimens and mutual interferences of different rare earths and (or) non-rare earth metals. An internal standard was employed for the compensation of the self-quenching of emission spectra. Yttrium and gadolinium oxides used for the base materials were purified by ion exchange to 7-nines purity with respect to the rare earth contents. They were further purified twice by homogeneous precipitation to remove non-rare earth impurities. The ignition of the oxalates into oxides were done at 1200°C for 4 hours. The selfquenching effect in emission spectra of rare earth impurities increased with the amounts of co-existent other rare earths, especially of terbium and (or) praseodymium. The effect was much larger in gadolinium oxide than in yttrium oxide. The use of praseodymium and dysprosium as the internal standard elements respectively for the analyses of yttrium and gadolinium oxides eliminated the influences of those impurities.
The coefficients of variation in the results of analysis were 6.68.6% for 2 ppm of terbium, europium and dysprosium in yttrium oxide and 5.28.2% for 2 ppm of terbium, europium and praseodymium in gadolinium oxide.View full abstractDownload PDF (1553K) -
Hidetsuru MATSUSHITA, Keiichi ARASHIDANI1971 Volume 20 Issue 1 Pages 78-83
Published: January 05, 1971
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSTwo-dimensional dual band thin-layer chromatography was successfully applied to the separation of phthalodinitriles and related metabolites.
The following two chromatoplates were used: (a) that composed of acetylated cellulose F layers (15×20, 1×20 cm) and silica gel HF layer (4×20 cm) the bottom of which was shaped like a comb, and (b) that composed of acetylated cellulose F layers (15×20, 1×20 cm) and mixed layer of silica gel HF and micro-crystalline cellulose powder (1 : 1, w/w; 4×20 cm).
The first development was carried out on the silica gel HF layer or silica gel HF-micro-crystalline cellulose layer with carbon tetrachloride-ethyl acetateacetic acid (7 : 2 : 0.5, v/v) until the front of developer reached 15 cm. After the development, the plate was withdrawn from the developing chamber and airdried for about 20 min. It was rotated 90° inserted into another chamber and then developed on the acetylated cellulose F layer with methanol-ethyl ether-water (7 : 2 : 0.5, v/v). The second development was continued until the front of developer reached 10 cm line from the boundary. The compounds separated on the chromatoplate were detected under short wavelength ultraviolet light (253 mμ).View full abstractDownload PDF (1116K) -
Masahiro TSUBOUCHI1971 Volume 20 Issue 1 Pages 83-86
Published: January 05, 1971
Released on J-STAGE: February 16, 2010
JOURNAL FREE ACCESSTetraethylammonium(TEA) ion is extracted as the ion-pair with tetrabromophenolphthalein ethyl ester (TBPE). In the recommended procedure, a sample containing 313 μg of TEA is taken in a separatory funnel, and 5 ml of borate(0.1 M)phosphate(0.2M) buffer (pH 10) and 2 ml of 10-3 M TBPE alcohol solution are added. It is diluted to 25 ml with water, and shaken with 10 ml of 1, 2-dichloroethane for 1 min. The extract is filtered through a dried filter paper to remove droplets of water. The absorbance is measured at 615 mμ against a reagent blank.
The optimum pH range for the extraction is 9.510.5. The absorbance showed a linear relationship to the concentration of TEA in the aqueous solution over the range of 8×10-74×10-6 M.View full abstractDownload PDF (626K) -
Hiroshi ONISHI, Hitoshi NAGAI1971 Volume 20 Issue 1 Pages 86-90
Published: January 05, 1971
Released on J-STAGE: February 16, 2010
JOURNAL FREE ACCESSA spectrophotometric method is described for the determination of 420 μg of tantalum. Seven ml of 8N sulfuric acid and 2.5 ml of 5% hydrofluoric acid solution are added to the sample solution. The solution is diluted to 25 ml with water and allowed to stand for 3060 min. One ml of 0.001 M Methylene Blue is added and the solution is shaken with 10.0 ml of 1, 2-dichloroethane. The organic phase is filtered through dry paper and diluted with an equal volume of 1, 2-dichloroethane. The absorbance of the solution is measured at 660 nm against 1, 2-dichloroethane.
The apparent molar absorptivity is 1.0×105 at 660 nm and the sensitivity is 0.0018 μg Ta/cm2 for an absorbance of 0.001. Microgram amounts of boron and perchlorate and 0.1 mg of niobium interfere. However, microgram amounts of tantalum can be separated from 10 mg of niobium by extraction of the former with methyl isobutyl ketone from a solution that is 1 N in hydrofluoric acid and 2 N in hydrochloric acid. The tantalum is back-extracted with hydrogen peroxide.View full abstractDownload PDF (730K) -
Spectrochemical analysis of titanium and its alloy. IIITetsuo MATSUMURA, Naomi KOTANI, Yutaka KUDO, Nobuhiro HASEGAWA, Takash ...1971 Volume 20 Issue 1 Pages 91-99
Published: January 05, 1971
Released on J-STAGE: February 16, 2010
JOURNAL FREE ACCESSSpectrochemical standard samples of titanium and its alloy were prepared. The various sample preparation alternatives are employed : (1) the extraction of billet from the products, which has an advantage of the same metallurgical history as analytical samples, (2) consumable argon arc melting, which is suitable to get a large scale ingot, (3) button arc melting, which is easy to obtain for all interesting alloying elements in varying concentrations in different kinds of samples, and (4) sintering of metallic powder.
Prepared standards are eight series of thirty three samples for alloys and one series of five samples for titanium. The elements are aluminum, chromium, cobalt, iron, molybdenum, tantalum, tin, vanadium and zirconium in alloys, and aluminum, chromium, iron, manganese, molybdenum, palladium, silicon, tin, vanadium and zirconium in titanium. Homogeneity of the samples was 0.46 to 1.57% as coefficient of variation for billet, 0.50 to 0.55% for ingot by consumable argon arc melting, and 0.53 to 2.97% for button ingot.
The remelting procedure to form a button ingot and the technique to get a cylindrical ingot for a disc sample were successfully used for X-ray analysis.
The criteria of evaluation and the performance for standards are discussed with the practical application to the X-ray analyses.View full abstractDownload PDF (1795K) -
Koji KAWANABE, Aiko FUJIOKA, Nagatoshi HIRASAWA, Koko KOBAYASHI, Kozo ...1971 Volume 20 Issue 1 Pages 100-102
Published: January 05, 1971
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSThe separation and identification of sulfide, sulfite and cyanide ion among 20 common anions were examined on two kinds of plates by using three developing solvents.
The separation of SO32-, I-, SCN-, Br-, NO3-, ClO3-, BrO3-, Cl-, IO3-, Fe(CN)63-, and Fe(CN)64- with acetone-water (10 : 1) and of SO32-, S2-, NO2-, S2O32-, CrO42-, C2O42-, AsO33-, AsO43-, SO42-, F-, PO43-, and BO2- with methanol-n-butanol-water (3 : 1 : 1) on a plate of HCl-treated silica gel containing 5% soluble starch and 5% sodium carbonate and the separation of CN- as Hg(CN)2 by acetone-benzene (1 : 1) on a plate of the silica gel containing 5% soluble starch were successfully carried out. Fuchsin for SO32-, 5% silver nitrate for S2- and cupric-acetate benzidine-acetate for Hg(CN)2 were satisfactorily as the identification reagent.View full abstractDownload PDF (636K) -
Shinya KONNO, Noriko YAMAMOTO, Saburo YANAGISAWA1971 Volume 20 Issue 1 Pages 102-104
Published: January 05, 1971
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSSulfur trioxide in the atmosphere turns partly to sulfuric acid aerosol which is difficult to be absorbed in water in the collection process using a bubbler.
A new sampling technique was developed for collecting this aerosol quantitatively using an absorbent containing a nonionic surfactant, i.e. an aqueous solution of nonionic surfactant (0.05 weight percent polyoxyethylene alkylphenolethcr) added with isopropanol (28.8 volume percent) as an anti-foaming agent for adjusting the height of the foam on the absorbent. The foam height was maintained at 12 cm in a 250 ml bubbler for a gas flow rate of 1 liter/min.
For synthetic samples containing 100 to 700 ppm of sulfur trioxide, the collecting efficiencies were higher than 99.5%. The surfactant used did not interfere with the determination of sulfur trioxide by Arsenazo III method.View full abstractDownload PDF (683K) -
Yoshitaka YOICHI, Akira SANO, Masakazu UENO1971 Volume 20 Issue 1 Pages 104-106
Published: January 05, 1971
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSThe color reaction of secondary amine with carbon disulfide and copper(II) has been applied to the colonmetric determination of methoxyphenamine hydrochloride in mixed pharmaceutical preparations.
Methoxyphenamine hydrochloride was treated with carbon disulfide in an ammoniacal solution to form dithiocarbamic acid which reacted with copper(II) to form a yellow complex.
The absorbance measured at 438 mμ against the reagent blank obeyed Beer's law in the concentration range of 10100 μg/ml of methoxyphenamine hydrochloride.
In this colorimetric determination, most primary and tertiary amines do not interfere. Therefore the present method is of great advantage for determina tion of methoxyphenamine in pharmaceutical preparations which contain primary and tertiary amines.View full abstractDownload PDF (536K) -
Shozo TODA, Yukio KOJIMA1971 Volume 20 Issue 1 Pages 106-108
Published: January 05, 1971
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSA new type of disposable polyethylene cell was designed for measurement of far-infrared absorption spectrum. This cell was consisted of two parts, and they were fixed in layers by an electric welder. Liquid sample was injected into the cell by a syringe and two holes by needle were sealed with melted paraffin wax. Paste sample was laid between the two parts before fixing by the welder. Coefficient of variation of the absorbance at 343 cm-1 of petroleum ligroin for eight cells was 4.2%.View full abstractDownload PDF (503K) -
[in Japanese]1971 Volume 20 Issue 1 Pages 112-123
Published: January 05, 1971
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSDownload PDF (2139K) -
[in Japanese]1971 Volume 20 Issue 1 Pages 124-129
Published: January 05, 1971
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSDownload PDF (1206K)
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