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Volume 43 (1989)
- Issue 4 Pages 191-
- Issue 3 Pages 141-
- Issue 2 Pages 65-
- Issue 1 Pages 3-
Volume 43, Issue 1
Displaying 1-6 of 6 articles from this issue
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Takanobu SUGO, Kyoichi SAITO1989 Volume 43 Issue 1 Pages 3-12
Published: 1989
Released on J-STAGE: February 19, 2013
JOURNAL FREE ACCESSDownload PDF (6644K) -
Yoshihiro WADA1989 Volume 43 Issue 1 Pages 13-27
Published: 1989
Released on J-STAGE: February 19, 2013
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Studies on Environmental Analysis (Part 44)Futoshi SUGIMOTO, Yoshimichi MAEDA, Takatugu AZUMI1989 Volume 43 Issue 1 Pages 28-31
Published: 1989
Released on J-STAGE: February 19, 2013
JOURNAL FREE ACCESSWe studied for a change of chromium in seawater and for a oxidation of chromium (III) by chlorine. Inseawater, neither oxidation nor reduction of chromium (III) and chromium (VI) occured.
On the other hand, when chromium (III) was added to tap water, it was oxidized by residual chlorine in tap water; and in seawater after the addition of sodium hypochlorite solution, oxidation from chromium (III) to chromium (VI) was found, as in the case of tap water.View full abstractDownload PDF (2280K) -
Yasushi NIINO, Hitomi NISHIMURA, Noboru OGATA1989 Volume 43 Issue 1 Pages 32-38
Published: 1989
Released on J-STAGE: February 19, 2013
JOURNAL FREE ACCESSIon chromatography was studied for convenient and rapid determination of bromide and sulfate in common salt without pre-conditioning. The results of the experiment were good, as follows.
1) Ion chromatography was applicable to simultaneous determination of both bromide and sulfate in salt sample at concentration below 0.2% (0.0605mg as chloride) of sodium chloride.
2) The ultraviolet detection method was more precise and sensitive than electric conductivity detection method in the determination of bromide, because the interference of chloride was reduced by the ultraviolet method.
3) The measurement as the peak height was better than that as the peak area at the high-sensitivity determination or in high-concentration of sodium chloride.
4) The sensitivity of this method was enough to measure 2μg/l of bromide. The determination values of high-grade salts were in the range from 29 to 70mg/kg in guaranteed reagent and 13 mg/kg in standard reagent.
5) The values of bromide and sulfate obtained from salt and seawater samples by ion chromatography agreed well with those obtained by the conventional volumetric or spectrophotometricmethod.
Thus, ion chromatography was applicable to simultaneous determination of bromide and sulfate in salt solution and seawater sample with simple dilution, and it resulted in reduced operating time and imnroved precision.View full abstractDownload PDF (4214K) -
Studies on the Property of Matter of Common Salt (Part 3)Tomio SHINOHARA, Nobuhiko SETOYAMA, Noboru OGATA1989 Volume 43 Issue 1 Pages 39-47
Published: 1989
Released on J-STAGE: February 19, 2013
JOURNAL FREE ACCESSThe application of the continuous measurement of moisture content by the industrial reflective sensor SAM-2 to some kinds of salt such as common salt and kitchen salt was examined.
The application results to the manufacturing process were as follows.
1) The output voltage values were correlated with the distance and the angle between the sensor and the thickness of the salt layer when moisture was constant. The values were definite within the ranges of certain conditions in each case.
2) In the case of some kinds of salts, the relation between moisture content and the output voltage can be measured accurately with the second regression analysis.
3) When the size and the shape of the particle are different, preparation of the other calibration is required.
4) Components, such as calcium and magnesium in bittern, did not affect the output voltage within the amount in the common salt and the kitchen salt.
5) In the measurement of several products manufactured by the three salt-producing factories, good correlation was observed between moisture content and the output voltage.
6) In a manufacturing process, the standard deviation (σ) of the difference between the heating method and SAM-2 was 0.0484% for the common salt and 0.0123% for the kitchen salt.View full abstractDownload PDF (5881K) -
Susumu KAWAKUBO, Masaaki IWATSUKI, Tsutomu FUKASAWA1989 Volume 43 Issue 1 Pages 48-53
Published: 1989
Released on J-STAGE: February 19, 2013
JOURNAL FREE ACCESSA technique for microscale ion-exchange separation of manganese at 0.1ng levels was developed and combined with flow-injection spectrophotometry based on manganese-catalyzed oxidation of malachite green with periodate. A sample (0.2 to 1.5g) was dissolved in less than 4.5ml of a 0.04M ammonia-0.16M ammonium chloride buffer solution (pH 9). The solution was then passed through a chelate resin micro column of 20 μl capacity (Dowex A-1, 50 to 100 mesh) to adsorb manganese and to remove the interfering matrix salt. The adsorbed manganese was eluted with 0.3ml of 2M nitric acid. A column of 10μl capacity could be used for less than 1ml of the sample solution. After evaporation of the effluent, the residue was dissolved with 0.1M acetate buffer solution (pH 4.4), and a 100μl aliquot was injected into a flowinjection system. The reduction of absorbance of malachite green was measured at 615nm after reaction for 6.5min at 50°C. Manganese of ppb levels in high purity salt is determined within a standard deviation of about 0.1ppb.View full abstractDownload PDF (4164K)
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