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Volume 16 (1970)
- Issue 6 Pages 285-
- Issue 5 Pages 235-
- Issue 4 Pages 165-
- Issue 3 Pages 105-
- Issue 2 Pages 45-
- Issue 1 Pages 1-
Volume 16, Issue 5
Displaying 1-9 of 9 articles from this issue
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[in Japanese]1970 Volume 16 Issue 5 Pages 235-240
Published: October 31, 1970
Released on J-STAGE: May 30, 2008
JOURNAL FREE ACCESSDownload PDF (696K) -
HISHASHI OTA, RYUGO ISHIBASHI1970 Volume 16 Issue 5 Pages 241-245
Published: October 31, 1970
Released on J-STAGE: May 30, 2008
JOURNAL FREE ACCESSTin (IV)-chloranilate complex was used in the determination of sulfate. The principle of this method is based on the colorimetry of the purple solution of tin (IV)-chloranilate complex produced by barium chloranilate and tin (IV) ion in dil, hydrochloric acid. The procedure was as follows : to 10 ml of a sample solution were added, 10 ml of 99.5% ethanol and 0.1 g of barium chloranilate in that order, shaken for 10 min, and filtered. A 10 ml aliquot of the filtrate was mixed with 2.0 ml of tin (IV) chloride solution in dil. hydrochloric acid. The absorbance of developed color of tin (IV)-chloranilate complex was measured at 540 mμ after about 10 min. The standard deviation was 1.4% on an average absorbance 0.344 of samples containing 120 ppm of SO2-4. It is necessary to use cation exchanger resin in order to eliminate interfering ions. The spectrophotometric procedure can be applied to the determination of sulfate in lead candle dioxide which has been exposed to atmospheric sulfur pollution. As absorbance of tin (IV)-chloranilate complex is constant over a wide range of pH values, it is unnecessary to use a buffer solution. Therefore, the method described above will be more convenient than the gravimetric method commonly used as PbO2 method.View full abstractDownload PDF (560K) -
An Investigation for Color Reaction of Dehydroacetic Acid and Related Compounds with SalicylaldehydeKIYOSHI SASAKI1970 Volume 16 Issue 5 Pages 246-253
Published: October 31, 1970
Released on J-STAGE: May 30, 2008
JOURNAL FREE ACCESSFor the determination of dehydroacetic acid, the color reaction of salicylaldehyde is usually employed. Although salicylaldehyde has been said to react with the CH3CO group in 3-position of dehydroacetic acid, the reaction mechanism is not well known. The purpose of the present investigation was to clarify the reaction mechanism of salicylaldehyde for dehydroacetic acid and to determine the interfering substances on detection of dehydroacetic acid in salicylaldehyde color reaction. It may be concluded from the present results that coloration of dehydroacetic acid with salicylaldehyde was not due to the CH3CO-group in 3-position of dehydroacetic acid, but caused to the acetone formed by alkali-cleavage of dehydroacetic acid. Coloration with salicylaldehyde was observed with parasorbic acid, rhamnose, fucose, and limonene among the substances not mentioned by Braunstein and Thomson.View full abstractDownload PDF (770K) -
YASUHIRO YAMANE, MOTOICHI MIYAZAKI, HIROSHI IWASE, TERUE TAKEUCHI1970 Volume 16 Issue 5 Pages 254-257
Published: October 31, 1970
Released on J-STAGE: May 30, 2008
JOURNAL FREE ACCESSThe concurrent analysis of 14 kinds of metals, Hg, Bi, Cu, Zn, Sn, Mn, Fe, Co, Ni, Cd, Pb, Al, Be and Cr was made by the combination of dithizone extraction and oxine, 2-methyloxine extraction and silica gel thin-layer chromatography. The metals, Hg, Bi, Cu, Zn and Sn were extracted from the sample water by dithizone at pH 3, and Mn, Fe, Co, Ni, Cd, Pb and Sn at pH 9. After extraction with dithizone, the sample water was subjected to oxine extraction to extract Al, Be and Cr at pH 8. The metals in dithizone and oxine, 2-methyloxine extracts were taken up into 0.5 ml of 10 N HNO3 and 3 N HCl, respectively. Separation of the metals in the acid extracts was made by thin-layer chromatography as in previous work. Using the methods here established, analyses for metals were performed on several sea and river waters obtained in Chiba prefecture.View full abstractDownload PDF (500K) -
TYUNOSIN UKITA, TOSHIAKI OSAWA, NOBUMASA IMURA, MASAHARU TONOMURA, YAS ...1970 Volume 16 Issue 5 Pages 258-266
Published: October 31, 1970
Released on J-STAGE: May 30, 2008
JOURNAL FREE ACCESSA convenient, quick, and accurate procedure for microdetermination of mercury contained in various kinds of materials, which can replace ordinary dithizonate colorimetry combined with wet-ashing method, was established. In this new method, the material is combusted in a platinum-coated-stainless-steel bomb which contains a solution of 20 ml of 2.0 N H2SO4 and 20 ml of 0.3% KMnO4 solution, and is filled with oxygen, and the solution of mercuric ion produced is submitted to followed determination by atomic absorp- tion spectrophotometry. Mercury in the combasted solution is converted into mercury vapor either, (1) by extraction of mercury with dithizone-benzene and subsequent heat-decomposition of the mercury dithizonate, or (2) by reduction of mercury with SnCl2. Both of these two procedures, when applied to subsequent determination of mercury by atomic absorption spectrophotometry, showed liniarity down to 0.5 μg when assayed at 253.7 mμ and sensitivity of 0.05 μg of mercury. The recovery rate of mercury contained in rice at a level of 10 ppm was 98% in average by this method. The new method was found to be applicable to various materials such as fish, rice, wheat, cabbage, hair, blood, animal organs, and solid of river or lake bed and gave better results than other procedures.View full abstractDownload PDF (930K) -
TERUO FUKUDA, REIKO KANEDA1970 Volume 16 Issue 5 Pages 267-268
Published: October 31, 1970
Released on J-STAGE: May 30, 2008
JOURNAL FREE ACCESSThe paper electrophoretic method to separate and identify fat-soluble dyes was investigated by using 5 N acetic acid and 5 N formic acid (with 90% ethanol) as the electrolyte. The mobilities of the compounds were expressed as that relative to auramine. It was found that all the compounds tested can be identified by selecting a suitable electrolyte.View full abstractDownload PDF (391K) -
YUKO OBAYASHI, KAZUKO URANO, KIYOMI KUROSAKI, JUNKO TANIMOTO, AKIKO NO ...1970 Volume 16 Issue 5 Pages 269-271
Published: October 31, 1970
Released on J-STAGE: May 30, 2008
JOURNAL FREE ACCESSThree methods for the determination of milk fat, namely, Gerber's, TeSa's and Japanese detergent method, were compared for accuracy, safety, and rapidity. TeSa method needs neither corrosive acid nor centrifuge machine, and if its reagents were fresh, it gives good results even in field experiment, but their patented reagents cannot be easily obtained in Japan. The Japanese detergent method using Tween 80 is the same as Gerber's in accuracy and rapidity, but because of the detergent action, it is necessary to employ a new model of butyrometer, and if not, the rubber stopper comes off easily. The Japanese method with this special butyrometer seems to be the most convenient in all points.View full abstractDownload PDF (431K) -
KOKU MATSUMOTO, MASATOSHI INOUE, TADASHI FUJITA, YUZURU KITAMURA1970 Volume 16 Issue 5 Pages 272-280
Published: October 31, 1970
Released on J-STAGE: May 30, 2008
JOURNAL FREE ACCESSThe present investigation was undertaken to apply theoretical methods to the ventilation of polluted air in a room where carbon dioxide was not homogeneously diffused. Assuming that the concentration of carbon dioxide depends on time and space, the following equation can be obtained on one and two dimensional spaces in a room (Subscripts denote spaces in a room). a-exp[log{C (t)/C (0)}/t] where a is a ventilation constant (a〓0), and C (t) and C (0) are the concentration of carbon dioxide at t and t=0, respectively. When ventilation was carried out with evolution of carbon dioxide, the following equation is obtained : log α=log[{C (t+10)-C (t)}/{C (t)-C (t-10)}]/10 where α is also a ventilation constant and C (t+10) and C (t-10) are concentrations of carbon dioxide at time t+10 min and t-10 min, respectively. According to a difference method, the following equation is obtained : U (t)={(A-B)+(A+B) (1-2a)t}/2 where U (t) is the concentration of carbon dioxide in the room at time t, and A and B are concentrations of carbon dioxide in the room and outdoor at t=0, respectively. It was found that above equation was available for the theoretical study of ventilation of polluted air diffused heterogeneously in room.View full abstractDownload PDF (769K) -
SHOICHI YAMANAKA, DAIJI MIZUNO, SHIGERU ISHII, MAKI HAYASHI, TSUTOMU U ...1970 Volume 16 Issue 5 Pages 281-283
Published: October 31, 1970
Released on J-STAGE: May 30, 2008
JOURNAL FREE ACCESSPollution of sea water in Tateyama beach in Chiba Pref. by coli-form group bacteria was examined and following results were obtained. Sea water has bectericidal activity against Escherichia coli B. Linear correlation coefficient, calculated between the concentration of halogen ions and the logarithmic transformed MPN-value for coli-form group bacteria, was -0.774 (N=10) and showed clear significance at 1% level. The extent of pollution by these bacteria being introduced from rivers and sewages seemed to be mainly affected by the bactericidal nature of the sea water in addition to the dilution by the sea water.View full abstractDownload PDF (441K)
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