Bulletin of the Society of Sea Water Science, Japan
Online ISSN : 2185-9213
Print ISSN : 0369-4550
ISSN-L : 0369-4550
Volume 67 , Issue 1
Showing 1-8 articles out of 8 articles from the selected issue
Greeting
Special Issue : “Recent Progress in Salt and Seawater Analysis and Its Reliability Improvement”
Commentary
Review
  • Keiichi FUKUSHI, Takanari HATTORI, Yuichiro HIDAKA
    2013 Volume 67 Issue 1 Pages 19-32
    Published: 2013
    Released: September 17, 2014
    JOURNALS FREE ACCESS
    Innovative applications of capillary zone electrophoresis (CZE) for determining of inorganic ions in seawater were comprehensively reviewed. Other highly saline samples, such as brine water, formation water, cooking salts, and jellyfish were also included. Emphasis was placed on covering almost all references published from the beginning to the present for seawater analysis using CZE. The procedures for minor and major anions and cations introduced were tabulated for the purpose of facilitating the method selection. References published from 1993 to January 2013 were summarized in this review.
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  • Yasutada SUZUKI
    2013 Volume 67 Issue 1 Pages 33-40
    Published: 2013
    Released: September 17, 2014
    JOURNALS FREE ACCESS
    This review describes applications of flow analytical systems to the determination of inorganic trace components in seawater and salt samples. Determination of trace components is important for understanding mass circulation, and for evaluating the degree of pollution in seawater, as well as for the evaluation of the quality of salts; however, trace analysis is not an easy task because of the high salinity of seawater. The flow analytical system can be a solution for preconcentration of analyte in addition to separation of matrix. Various applications of flow analytical systems to the analysis of seawater are classified with their analytes.
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Original Paper
  • Haruna FUJII, Takuya ASADA, Yasushi NODA
    2013 Volume 67 Issue 1 Pages 41-46
    Published: 2013
    Released: September 17, 2014
    JOURNALS FREE ACCESS
    To develop a highly sensitive yet easy to use method for determining the fluoride ion in salt, we examined the use of ion chromatography (IC) after the application of zirconium-loaded solid phase extraction (Zr-SPE). In IC, fluoride and iodate ions were separated by a high capacity column with a weak concentration (0.75 mM) of sodium carbonate in the mobile phase. The sodium hydroxide concentration in the IC sample solution was adjusted to 30 mM such that a sufficient number of theoretical plates was obtained. On the other hand, the eluent for Zr-SPE required a 50 mM concentration to elute the fluoride ions from the solid phase. Then, the eluate was diluted to adjust the sodium hydroxide solution to 30 mM. For salt with an aluminum, the recovery of the fluoride ions in Zr-SPE was adversely affected. Thus, the aluminum was removed from the sample solution through the extraction of acetylacetone, which improved the recovery of the fluoride ions. We applied this method to real samples to confirm the efficacy of the method. Using this method, the fluoride ion in salt can be determined easily and very accurately.
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Note
  • Yasutada SUZUKI, Masaru ISHIGAKI, Koji OSHITA, Takeshi YAMANE, Susumu ...
    2013 Volume 67 Issue 1 Pages 47-51
    Published: 2013
    Released: September 17, 2014
    JOURNALS FREE ACCESS
    A portable LED-based 8-channel reflective colorimeter has been developed. It has eight LEDs whose wavelengths are 430, 470, 525, 565, 590, 635, 660, and 740 nm, respectively, and their light emissions are merged by means of plastic-core fiber optics and led to the surface of a solid sample vertically. Each LED is turned on and off sequentially and the light reflected by the sample is detected by a photodiode mounted at 45° with respect to both the sample surface and the light source. Another photodiode is mounted behind the LEDs and used to correct the fluctuation of LED emission. The Kubelka-Munk function (K-M) for each LED is calculated by an embedded controller and displayed on a liquid crystal display (LCD). This colorimeter is applied to the sensitive determination of hexacyanoferrate (II) in common salts. Hexacyanoferrate (II) reacts with iron (II) sulfate and they produce iron (II, III) hexacyanoferrate (II, III) complex (Prussian blue dye). Then the precipitate is filtered by membrane filter and its K-M at 635 nm measured for the construction of a calibration curve. The obtained calibration curve is linear, between 2.5 and 30 μg of sodium hexacyanoferrate (II), and the detection limit is 0.6 μg (calculated from 3 σ of determination results for 2.5 μg hexacyanoferrate (II), n = 5). Recovery tests are performed with the commercial common salt sample spiked with 1.25 and 10 μg g-1 of hexacyanoferrate (II), and the results are from 96 to 113%.
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Original Paper
  • Kazuko YAMAMOTO, Kazuyo MIURA, Hideyuki SAKAMOTO, Akira YONETANI, Tosh ...
    2013 Volume 67 Issue 1 Pages 52-58
    Published: 2013
    Released: September 17, 2014
    JOURNALS FREE ACCESS
    The solid-phase extraction of arsenic was investigated. Zirconium (IV) oxide-supported polyamino-polycarboxylic acid type chelating resin was used in an attempt to concentrate arsenic. The amount of arsenic (Ⅲ) adsorbed on the resin exceeded 90% at pH 7.5-8.5, and the amount of arsenic (Ⅴ) adsorbed on the resin exceeded 90% at pH 2-8.5. The adsorbed arsenic could be eluted using 0.1M sodium hydroxide solution, and was then determined by Electrothermal Atomic Absorption Spectrometry. Adsorption behavior of five different organic arsenic compounds {Monomethylarsonic acid (MMA), Dimethylarsinic acid (DMA), Trimethylarsineoxide (TMAO), Arsenobetaine (AB), Arsenocholine (AC)} were studied with the described method. MMA was well adsorbed. However, other compounds showed low recovery. Decomposition of organic arsenic compounds were examined by photolysis by means of low-pressure mercury lamp. All organic arsenic compounds could be adsorbed on the resin. The proposed method was applicable to the analysis of river water samples and seawater certified reference materials.
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