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Volume 16, Issue 11
Displaying 1-25 of 25 articles from this issue
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Takashi SHIMANUKI1967 Volume 16 Issue 11 Pages 1135-1140
Published: November 05, 1967
Released on J-STAGE: February 16, 2010
JOURNAL FREE ACCESSA rapid method for the determination of phosphorus in ferroalloys which involves the extraction of phosphovanadomolybdic acid with methyl isobutyl ketone from acidic aqueous solution has been presented.
Optimum conditions for the formation of phosphovanadomolybdic acid were: (1) acid; sulfuric acid (0.81.5N), perchloric acid (0.81.6 N) and nitric acid (0.92.7 N), (2) amounts of reagents; 25ml of 1.2% ammonium vanadate solution and 5 ml of 10% ammonium molybdate solution, and (3) total volume of aqueous solution; 50 ml. The sample solution preliminarily adjusted to fulfill above conditions was shaken with 10 ml of methyl isobutyl ketone for 1020 sec. After standing, the organic layer was dry-filtered and its absorbance was measured. In addition, extraction ratio, mutual dissolution of acid solution and methyl isobutyl ketone, stability of extracts and the effect of heating on the result were examined.
The method has higher sensitivity at shorter wavelengths, and 1400μg of phosphorus could be determined with the same method by selection of wavelengths from 340 mμ to 460 mμ. Interfering elements and compounds were Ti, As, W, Cr, Si, Nb, Sn, Sb, large amounts of sulfate, organic acids and salts, and reducing agents.
The phosphorus in ferromanganese, ferrosilicon, silicomanganese and ferromolybdenum were determined. The accuracy was 0.83.2%.View full abstractDownload PDF (819K) -
Takashi SHIMANUKI1967 Volume 16 Issue 11 Pages 1141-1145
Published: November 05, 1967
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSIn order to determine phosphorus in ferrovanadium without separation of vanadium, a method which involves the extraction of phosphovanadomolybdic acid with methyl isobutyl ketone was presented. It was noticed that, in this method, arsenic which is usually only a minute component in ferrovanadium had an effect to give higher values, especially when the content of vanadium was so great in the sample solution. This effect was eliminated with the recommended procedure by adding a masking reagent for arsenic before the extraction or by removing arsenic itself.
(1) A sample containing 50±10 mg of vanadium was dissolved with 2ml of HNO3 and 7ml of HClO4 and fumed for a few minutes. The precipitate of vanadic acid was dissolved with about 30ml of water by gentle boiling. Five milliliters of 10% ammonium molybdate was added after cooling and the whole was diluted to about 50ml with water. After standing for 10 minutes, of sodium thiosulfate (4%, 67ml), organic acid or its salt such as citric acid (50%, 5ml) ammonium tartrate (25%, 10ml) or ammonium oxalate (4%, 10ml) as the masking reagent was added. Then it was extracted with 10ml of methyl isobutyl ketone. An immediate extraction after the addition was necessary when organic acid or its salt was used. The organic layer was then dry-filtered and the absorbance of the filtrate was measured at 420 mμ.
(2) A sample was dissolved with 12 ml of HNO3 and 1ml of (1 : 1) H2SO4 and fumed for a few minutes. Ten milli liters of HCl and 2 ml of HBr were added and the mixture was evaporated nearly to dryness. Six milli liters of HClO4 and about 30ml of water were added and the salt was dissolved by gentle holing with drops of H2O2 (30%) in order to oxidize vanadium. Then the procedure was carried through as above (1) without an addition of the masking reagent.
The methods were very rapid and the accuracy was within 3%.View full abstractDownload PDF (814K) -
Yoshizo HORIUCHI, Hiroshi NISHIDA1967 Volume 16 Issue 11 Pages 1146-1152
Published: November 05, 1967
Released on J-STAGE: February 16, 2010
JOURNAL FREE ACCESSOne tenth to 1.6 ppm of gallium and 0.4 to 10 ppm of indium were determined spectrophotometrically with CAS.
A solution containing gallium was diluted to 30 ml. The pH was adjusted to 4.3 with 0.5 M hydrochloric acid and 0.25 M sodium acetate solution, and 0.6ml of 0.275% CAS solution was added to it. After a dilution to 50ml, the absorbance was measured at 547mμ against a reagent blank. The apparent absorptivity was 4.95×104.
A solution containing indium was diluted to 30 ml and 1ml of 0.275% CAS solution was added. After the adjustment of pH to 5.8 with 0.5 M hydrochloric acid and 8% hexamine solution and a dilution to 50 ml, the absorbance was measured at 555mμ against a reagent blank. The apparent absorptivity was 7.1×103.
The mole ratios of metal and CAS in complexes were 1 : 2 in gallium complex, and 1: 1 or 1: 2 in indium complex, respectively.
Beryllium, aluminum, titanium, tin (IV), molybdenum for the determination of gallium, and copper, iron(III), beryllium, aluminum, gallium, titanium, zirconium and molybdenum for the determination of indium interfered seriously.View full abstractDownload PDF (996K) -
Kazuyoshi ONISHI1967 Volume 16 Issue 11 Pages 1152-1155
Published: November 05, 1967
Released on J-STAGE: February 16, 2010
JOURNAL FREE ACCESSA method with sodium-glass electrode has been studied for determination of sodium in raw sodium metatitanate.
With proper calibration with standard solution of sodium chloride, the sodium-glass electrode can indicate the values of pNa provided the pH of sample solution is from 6.8 to 7.3. The adjustment of pH is preferrably done by triethanolamine, whereby the electrode indicates correct pNa value of the solution, while ammonia gives erroneous results. About 0.5 g of tartaric acid should be added before the pH adjustment if Ti, Fe and Al ions are present in the solution.
Coefficient of variation 6.7% and relative error ±10.4%-4.2% were obtained for raw sodium metatitanate by the proposed method.View full abstractDownload PDF (784K) -
Study on analytical methods of steelmaking materials. VIRokuro KAJIYAMA, Masao WATANABE, Katsumasa YAMAGUCHI1967 Volume 16 Issue 11 Pages 1156-1159
Published: November 05, 1967
Released on J-STAGE: February 16, 2010
JOURNAL FREE ACCESSNiobium was separated from tantalum by precipitating quantitatively with oxine from a solution of pH 4.5 containing ammonium tartrate. A sample was fused with potassium pyrosulfate, and niobium and tantalum were separated from the matrix elements as their hydroxides by hydrolysis method. The precipitate was dissolved into a potassium hydroxide solution with hydrogen peroxide. Ammonium tartrate was added after the decomposition of hydrogen peroxide by boiling, and the whole was diluted with water to a definite volume. An appropriate aliquot (corresponding to ca. 25 mg of Nb) was taken, EDTA and ammonium tartrate were added, and the pH was adjusted to 4.5. Niobium was precipitated by adding oxine. The precipitate was dissolved in hydrochloric acid, and niobium was determined by conventional bromate titration. The precipitate was assumed to have a composition NbO(C9H6ON)3, 1 ml of 0.1 N potassium bromate solution corresponding to 0.7742 mg of niboium. Common impurities, i. e., less than 7.5% of aluminum, manganese and tin, and less than 5% of titanium and tungsten did not interfere.View full abstractDownload PDF (619K) -
Katsuya SATO, Masami MATSUI, Nobuo IKEKAWA1967 Volume 16 Issue 11 Pages 1160-1165
Published: November 05, 1967
Released on J-STAGE: February 16, 2010
JOURNAL FREE ACCESSOperating conditions in gas chromatography of triglycerides were investigated. Liquid phase OV-17 having a high thermal stability gave an excellent separation of triglycerides. The result by using OV-17 revealed the differences in the constituent triglycerides of butter and margarine. Better column packings were obtained by filtration method than by evaporation method. The regulation system for carrier gas with mass flow controllers improved the accuracy of quantitative determination of glycerides.
Lard, beaf tallow, whale oil, butter, margarine and cheese were analysed for their triglycerides, with a 35 cm glass column packing with 2% OV-17 on 80100 mesh Shimalite W, by programmed temperature gas chromatography between 200°C and 310°C.View full abstractDownload PDF (895K) -
Akira NONAKA1967 Volume 16 Issue 11 Pages 1166-1175
Published: November 05, 1967
Released on J-STAGE: February 16, 2010
JOURNAL FREE ACCESSAn adsorption gas chromatography using water vapor as the carrier can be applied to the separation of alcohols and other oxygen-containing organic substances, except polyalcohols and organic acids. The adsorbents made of crushed firebrick powder (SiO2, 50%; Al2O3, 45%; bulk density 0.80) are modified by hydrogen fluoride solution, so that they have 0.40.25 cm of H. E. T. P. and can separate C1C6 alcohols completely without a marked tailing, especially at low temperature. The order of elution for similar type of molecules may depend on the boiling point. It is operated at 110°C to 210°C, and samples are supplied as dilute aqueous solution not exceeding 0.01 %. Water vapor from sample and carrier does not give any unfavorable influence on the separation column and the hydrogen flame ionization detector employed. Neither extinction nor decomposition of the sample is seen during the column separation, an analysis of so dilute aqueous solution as 0.3 ppm can be achieved in this "steam carrier adsorption gas chromatography".View full abstractDownload PDF (1433K) -
Yuroku YAMAMOTO, Masahiro TSUBOUCHI, Ichizo OKIMURA1967 Volume 16 Issue 11 Pages 1176-1180
Published: November 05, 1967
Released on J-STAGE: February 16, 2010
JOURNAL FREE ACCESSA spectrophotometric determination of gold(III) by solvent extraction is proposed. It is found that a small amount of gold(III) is extracted into nitrobenzene as ion-pair formed between 1, 10-phenanthrolineiron(II) chelate cation and tetrachloroaurate anion, and there is a linear relationship between the absorbance in the organic phase and the concentration of gold(III) in the aqueous phase. The best extractant is nitro benzene and the absorbance maximum of the extracted species is at 516 mμ. The chemical formula of the extracted species is deduced from the continuous variation method to be [Fe(phen)3]2+ · [AuCl4]2-.
The recommended procedure for preparing the calibration curve is as follows.
Varying amounts of a standard tetrachloroauric acid solution (1.88 × 10-4M, 010 ml), 5 ml of tris (1, 10 -phenanthroline) iron (II) sulfate solution (2 × 10-3 M) and 5 ml of phosphate buffer solution (pH of the resulting solution may be adjusted to the range of 2.06.0) are mixed. The mixture is diluted to 25 ml with a relatively concentrated sodium chloride solution, so that the final concentration of the chloride ions is held to be constant such as 4× 10-2 M. Then the solution is shaken for 1 min with 10.0 ml of nitrobenzene, previously saturated with water. The absorbance of the organic phase is measured at 516 mμ against the reagent blank solution. Beer's law is followed in the range of 1.57.5 × 10-5 M of gold in aqueous phase, using 10 mm glass cells, and a good and constant extraction is obtained over the range of pH 2.0 to 6.0.View full abstractDownload PDF (770K) -
Yuroku YAMAMOTO, Takahiro KUMAMARU, Yasuhisa HAYASHI, Machiko YAMATE1967 Volume 16 Issue 11 Pages 1181-1188
Published: November 05, 1967
Released on J-STAGE: February 16, 2010
JOURNAL FREE ACCESSA spectrophotometric method for the determination of pentachlorophenol (PCP), based on solvent extraction of the ion-pair formed between tris(1, 10-phenanthroline)iron (II) and the anion of PCP into nitrobenzene, is proposed.
The absorbance maximum of the chelate in the organic phase is at 516 mμ. The chemical formula of the extracted species is deduced from continuous variation method to be [Fe(phen)3]·(C6Cl5O)2.
The calibration curve is constructed as follows.
To 2 ml of tris(1, 10-phenanthroline)iron(II) sulfate solution (5.0 × 10-3M) and 5 ml of phosphate buffer solution (0.3 M, pH 7) are added varying amounts of the standard PCP solution (1.24 × 10-4M, 15 ml). It is diluted to 25 ml with water, and is shaken for 1 min with 10.0 ml of nitrobenzene. The absorbance of the organic phase is measured at 516 mμ against the reagent blank.
The presence of a small amount of tetrachlorophenol (TeCP) gives a slightly positive error.
A method for the simultaneous determination of PCP and TeCP is also established, based upon the difference of pH dependence of the extraction(PCP: pH 6.512, TeCP: pH 8.512).
The method proposed here is applied to the analysis of technical PCP-Na with good results compared with those by IR or 4-aminoantipyrine method.View full abstractDownload PDF (1317K) -
Taitiro FUJINAGA, Kosuke IZUTSU, Hiromiti SAWAMOTO1967 Volume 16 Issue 11 Pages 1188-1192
Published: November 05, 1967
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSIn the amperometric titrations in very dilute solutions, it is difficult and uncertain to obtain the equivalent point by the tangent method. It is desirable, therefore, to correct the experimental data by theoretical calculation.
In this paper, a general equation of the tensammetric titration curves for oxine-dilute metal ion systems is considered by taking into account the equilibrium conditions and the sensitivity limit of the measurement. The calculated titration curves agree well with the experimental results reported previously. The applicability of these theoretical corrections were di scussed for various metal ions.View full abstractDownload PDF (736K) -
Keiichiro HOZUMI, Hideo TAMURA1967 Volume 16 Issue 11 Pages 1193-1199
Published: November 05, 1967
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSA response signal obtained from a differential thermal conductivity cell, which measures concentration of a selective component in a multi-component system, possibly involves an interfering fraction caused by a bridge unbalance when molar concentrations of undetectable components will vary. The bridge unbalance is mostly attributable to unequality of sensitivities between a pair of katharometers used for the conductivity cell, but the perfect equality may not be expected even with careful uniformities of geometrical constitution of the katharometers and the filaments, in case that high accuracy will be required.
The authors have therefore conducted a theoretical analysis on a possibility for counterbalancing the sensitivities of the katharometers by inserting a helicalohm, which is so-called a cell balancer, in the bridge circuit, so that the two filament currents could be retouched. A practical method derived from the theory for finding the actual balance point on the helicalohm has been executed utilizing an automatic recording analyzer for carbon, hydrogen and nitrogen, which employed the differential thermal conductometry.View full abstractDownload PDF (1203K) -
Yoshimi SASAKI1967 Volume 16 Issue 11 Pages 1199-1203
Published: November 05, 1967
Released on J-STAGE: February 16, 2010
JOURNAL FREE ACCESSAn extractive titration of iron(III) was attemped with a standard aqueous solution of cupferron as a titrant and tiron as an indicator. Chloroform was used as the extractant of iron(III) cupferrate. The titration was carried out at pH 3 of the initial aqueous solution, and only two or three rejections of the lower organic layer after each one minute's standing were sufficient for the satisfactory result. The standard cupferron solution was prepared by dissolving the reagent in water and standardized against a known amount of iron(III). By this method, 27μg/ml or more of iron could be determined. The effects of diverse metallic ions by the application of this method for rock salt, hydrochloric acid, potassium fertilizers and limestone, were examined.View full abstractDownload PDF (861K) -
Hitoshi KAMADA, Koichi IWATA, Iichi OGAHARA1967 Volume 16 Issue 11 Pages 1203-1209
Published: November 05, 1967
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSA simple and convenient apparatus for the determination of gases in metals is studied. Gaseous components in metal samples, i. e. oxygen, hydrogen, nitrogen are extracted in the form of CO, H2 and N2, respectively, and are separated by a gas chromatograph to be determined. To enhance rapidity and precision of measuring, a simple digital integrator using oneshot-multivibrator is added to the apparatus. The counting rate of integrator is 2000 count/sec for 10 mV imput voltage. The bias from the linearity between imput voltage and counting rate is less than 1%. Analytical curve for oxygen is obtained by injecting pure carbon monoxide into argon flow. The values of oxygen content in steels obtained by this method are well congruent with those obtained by the vacuum fusion method. The necessary measuring time is 4.5 minutes.View full abstractDownload PDF (1068K) -
Determination of metals in metal chelates by X-ray fluorescence analysis. IToshiyuki SHONO, Minoru TANAKA, Koichiro SHINRA1967 Volume 16 Issue 11 Pages 1209-1212
Published: November 05, 1967
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSCopper in copper chelates was determined by X-ray fluorescence analysis by using polyvinylchloride or polyester films in which the copper chelates were distributed or dissolved. A calibration curve was obtained by using the pure copper(II) acetylacetonate dissolved in plastic films as the standard. Determination of copper in several copper chelates and copper chelate-polymers referring to this calibration curve gave a satisfactory result.View full abstractDownload PDF (619K) -
Satori UTSUMI, Shunsuke ITO, Wataru MACHIDA, Akinori ISOZAKI1967 Volume 16 Issue 11 Pages 1213-1218
Published: November 05, 1967
Released on J-STAGE: February 16, 2010
JOURNAL FREE ACCESSThis work was attempted to find a rapid, simple and accurate method for the determination of alkylbenzene sulfonate(ABS) in water.
The complex formed between methylene blue and ABS is well extracted into organic solvents such as 1, 2dichloroethane, 1, 1', 2-trichloroethane and chloroform. ABS is determined by measuring the absorbancy of the organic layer at the absorption maximum wavelength. Single extraction with 10 ml of the solvent was found most practical. Although the method using extraction with dichloroethane or trichloroethane was more sensitive than the chloroform method, chloroform was chosen for the present work, because many anions which cause interference were easily removed by one washing of the extract with an acid solution of methylene blue.
The proposed method is suitable for the determination of ABS over the range from 0.1 to 4 ppm, by employing a 10 ml portion of sample water.View full abstractDownload PDF (971K) -
Kazuyoshi HAGIWARA1967 Volume 16 Issue 11 Pages 1219-1224
Published: November 05, 1967
Released on J-STAGE: February 16, 2010
JOURNAL FREE ACCESSThe substitution reaction of chromium(III) with Cd-EDTA has been investigated, and it was found that the reaction could be used for the determination of chromium.
At the pH range from 3 to 4, the reaction proceeded quantitatively by heating the solution for more than 45 minutes in boiling water. On the other hand, the wave height of free cadmium ion dissociated from Cd-EDTA decreased as the pH value of the solution increased, but the change of the wave height was negligible at the pH value above 4. Hence, it was desired that the substitution reaction was done at pH 3 to 4 and the measurement of the amount of substituted cadmium was done at pH above 4.
Linear relationship was found between the concentration of chromium and the peak current of cadmium, over the concentration range from 5×10-6 to 3×10-5 M of chromium.
Many metal ions except alkaline earth elements, manganese and cobalt interfered, but the interference from molybdenum could be eliminated by adding small amount of mannitol, and that from iron and aluminum. could be removed by applying the acetylacetonechloroform extraction.View full abstractDownload PDF (965K) -
Takanori SUZUKI1967 Volume 16 Issue 11 Pages 1224-1233
Published: November 05, 1967
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSThe emission spectroscopic analysis of high carbon low alloy steels is affected considerably by metallurgical history of samples. For the purpose of eliminating the matrix effect in their quantometric analysis, the relation between the emission characteristics and the microstructure of steels was investigated. The results obtained were as follows.
(1) As for the determination of Si and Mn in high carbon low alloy steels, the distinct difference between. quantometric and chemical values caused by the formation of austenite and martensite in the quenching process could be removed by tempering the specimen.
(2) The investigation of discharge craters showed. that the discharge occurred preferentially at the crystalline carbide grains of the quenched steel. The intensity of spectrum lines of carbide-forming elements, such as Mn, Cr, Mo, etc., was thus enhanced, and the higher values were obtained in quantometric determination. However, this effect could also be eliminated by the heat treatment.View full abstractDownload PDF (2892K) -
Hiroshi HAMAGUCHI, Kenji TOMURA, Naoki ONUMA, Hideo HIGUCHI, Kazuo SUD ...1967 Volume 16 Issue 11 Pages 1233-1238
Published: November 05, 1967
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSThere have been few reliable data of indium contents in silicate rock samples on account of the extremely low concentrations of the element. Neutron activation analysis has been developed for determining indium in rocks to obtain more reliable and comprehensive geochemical figures about indium.
Sample (ca. 0.4 g) and reference standard (0.1μg In) were irradiated for one hour in the TRIGA Mark II Reactor of Rikkyo University with the neutron flux of 5×1011n/cm2/sec. After the irradiation, the sample was decomposed by NH4F·HF-NH4NO3 fusion in the presence of indium carrier (20 mg). The induced radionuclide from indium was separated and purified from the matrix by hydrobromic acid-ether extraction, followed by CuS and SiO2 scavenging procedures. Finally, the indium was precipitated as sulfide and the β-activity of the purified isotope 116mIn was counted.
The total time required for the completion of the whole procedure was one hour and a half, and the average chemical yield was 50%. Some of the typical results obtained were summarized as follows (ppm In): G-1 0.026; W-1 0.057; Granites 0.042; Andesites 0.050; Basalts 0.083; Peridotites 0.025.
Errors due to self-shielding and competing nuclear reactions 116Sn(n, p)116In were also discussed.View full abstractDownload PDF (1153K) -
Studies on the fluorescence X-ray analysis of ferroalloys. IKinnosuke OKUDA1967 Volume 16 Issue 11 Pages 1239-1243
Published: November 05, 1967
Released on J-STAGE: February 16, 2010
JOURNAL FREE ACCESSMethods for crushing of ferroalloys to be suitable for their fluorescence X-ray analysis were studied. Powders of Fe-Mn, Si-Mn, Fe-Cr, Si-Cr and Ca-Si crushed about 200 μ in size were ground in the roulette mill in CO2 atmosphere to avoid oxidation. The results indicated that 30 sec. grinding was the most favorable, and that the optimum weight of sample is 3040 g. The flow rate of CO2 should be 2000 ml per min. Under this condition, particle size of resulted powder were maintained at 48μ. Contents of Mn, Cr, Ca and Si were not so changed in most alloys, but they were decreased about 0.5% in some alloys. To minimize decrease of contents, another experiment of roulette mill grinding was done in vacuum, but the result was not greatly different from that in the CO2. stream.View full abstractDownload PDF (704K) -
Wataru FUNASAKA, Kazumi FUJIMURA, Toshihiko HANAI1967 Volume 16 Issue 11 Pages 1244-1248
Published: November 05, 1967
Released on J-STAGE: February 16, 2010
JOURNAL FREE ACCESSA chromatographic separation of sugars and their phosphates such as fructose, glucose, glucose-1, glucose-6-, fructose-6-phosphate and fructose-1, 6-diphosphate has been studied.
A column of 250 mm×13 mmφ packed with DEAE cellulose of borate form gave an efficient separation, when glucose and fructose were eluted through the column with 0.015 M sodium tetraborate, subsequentely glucose-1-phosphate with a mixture of 0.010 M sodium tetraborate and 0.025 M ammonium chloride (1:1), glucose-6-phosphate with 0.04 M ammonium chloride, fructose-6-phosphate with a mixture of 0.02 M sodium chloride and 0.02 M hydrochloric acid (1 :1), and finally fructose-1, 6-diphosphate with a mixture of 0.02 M sodium chloride and 0.06 M hydrochloric acid (1:1).
The eluate concentration was determined by anthrone method.
The elution behaviors of such sugars and their phosphates on DEAE Sephadex and ECTEOLA cellulose, together with their adsorption isotherms, have also been given.View full abstractDownload PDF (627K) -
Hidehiro TOTO, Yachiyo KAKITA, Norio ICHINOSE1967 Volume 16 Issue 11 Pages 1249-1251
Published: November 05, 1967
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSA recommendable spectrophotometric method has been developed for the determination of traces of gallium and indium by the extraction of the oxinates with benzene. Gallium and indium are transferred to benzene layer as yellow oxinates, which are produced in an aqueous medium at pH 5 initially, and they are measured spectrophotometrically. The maximum absorption of the oxinate of both gallium and indium in the extract is found to be at around 400mμ. Using 1-cm cuvettes, the optimum concentration range for the accurate determination is found to be from 1 to 40μg for gallium and 2 to 70μg for indium per 10 ml of organic solvents respectively. The molar extinction coefficient is calculated to be 7.18×103 in the case of gallium oxinate and 7.00×103 in that of indium oxinate.View full abstractDownload PDF (538K) -
Kiichi YAMASHITA, Yoshihisa ISHIZUKA, Syogo OCHIAI, Yoshio SAIKI, Osam ...1967 Volume 16 Issue 11 Pages 1251-1253
Published: November 05, 1967
Released on J-STAGE: February 16, 2010
JOURNAL FREE ACCESSRecently, withering of trees due to the waste gas exhausted from the factories and automobiles gives public a serious problem. The authors examined a relationship between air pollution and sulfur contents in leaves in Yokohama and Kawasaki cities analytically. Consequently, it was found that sulfur contents in leaves were almost proportional to the degree of air pollution by sulfur dioxide. Sulfur contents in leaves at the air pollution zone, i.e. coastal industrial zone, were found to be 0.39% for chamaecyparis obtusa, 0.43% for cryptomeria japonica and 0.50% for chamaecyparis pisifera, and they were three times, four times and two times as much as that of non-air pollution zone, respectively.View full abstractDownload PDF (429K) -
[in Japanese]1967 Volume 16 Issue 11 Pages 1254-1258
Published: November 05, 1967
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSDownload PDF (1250K) -
[in Japanese]1967 Volume 16 Issue 11 Pages 1259-1265
Published: November 05, 1967
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSDownload PDF (1292K) -
[in Japanese]1967 Volume 16 Issue 11 Pages 1276-1277
Published: November 05, 1967
Released on J-STAGE: June 30, 2009
JOURNAL FREE ACCESSDownload PDF (340K)
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