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  • Springer  (3)
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  • 1
    Electronic Resource
    Electronic Resource
    The content of selenium and its chemical form in sea water (1976)
    Springer
    Journal of oceanography 32 (1976), S. 235-241 
    Details
    ISSN: 1573-868X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract By using the new fluorometric method of determination of the total selenium (Σ Se), Se (IV) and Se (VI), the content of selenium in sea weter was determined in the western North Pacific. Results showed that the content ofΣ Se in surface water ranged from 0.06 to 0.12μg l−1, while in deeper layers, the content increased to 0.20μg l−1. It was found that Se (IV) showed rather uniform distribution with depth, while Se (VI) increased with depth to about three times that in the surface. The ratio of Se (IV) to theΣ Se ranged from 0.5 to 0.8 in the surface and 0.4 to 0.6 in the deep. The coexistence of the hexa- and tetravalent ions of selenium was confirmed both in surface and deep layers. Some results of observations on the content of selenium in the coastal areas of Japan were also reported.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02107126
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    A new fluorometric method of analysis of selenium in sea water (1977)
    Springer
    Journal of oceanography 33 (1977), S. 23-29 
    Details
    ISSN: 1573-868X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract A new method of determination of selenium and separation of Se(IV) and Se(VI) in sea water is described. The selenium is determined by fluorometric method using Se-DAN complex in cyclohexane media. Prior to the fluorometric determination, Se(IV) is separated from sea water by means of Se(IV)-DDTC complex which is adsorbed on the macroreticular resin. As to the separation of the total selenium from sea water sample, the reduction and coprecipitation method is used. Se(VI) is determined with the same method as used for the total selenium after the separation of Se(IV). The average recoveries are 92.5±1.3% for Se(IV) and 97.4±0.9% for ∑Se. The standard deviation of analytical results is below 10%.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02110845
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Chemical forms of minor metallic elements in the ocean (1978)
    Springer
    Journal of oceanography 34 (1978), S. 93-96 
    Details
    ISSN: 1573-868X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract In order to clarify the chemical forms of minor metallic elements occurring in the ocean, a new method of separation of organic compounds of metals in sea water by using XAD-2 resin was contrived. By applying the new method of determination, it is found that, (1) More than 80 % of V, Fe, Cd and Cu dissolved in sea water are present in organic forms regardless of the depth; (2) A most part of Co and Pb are present in organic forms near the surface, but they change into inorganic forms in the deep layer up to 50 to 60%; (3) Of the total amounts of dissolved Al, Ni, Zn, Ag, Mo, and U, less than 30 % are present in organic forms in sea water anywhere in the ocean; (4) Up to 45% of Se is in organic forms.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02109258
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    Paper (German National Licenses)
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