Journal of Japanese Association of Hydrological Sciences
Online ISSN : 1883-7166
Print ISSN : 1342-9612
ISSN-L : 1342-9612
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Volume 28, Issue 4
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  • Sources of Nitrate-nitrogen in Unconfined Groundwater at the Kaneko Upland Area, Saitama Prefecture, Japan.
    Yumi OGAWA, Norio TASE, Tetsuya HIYAMA, Jun SHIMADA
    1998 Volume 28 Issue 4 Pages 125-134
    Published: 1998
    Released on J-STAGE: January 07, 2019
    DOIhttps://doi.org/10.4145/jahs.28.125
    JOURNAL FREE ACCESS
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    Nitrate concentrations in excess of national drinking-water standards (10mg/L as N) have been found in unconfined groundwater at Kaneko upland area.

    To investigate the nitrate-nitrogen sources in the groundwater, nitrogen-isotopic compositions of nitrate-nitrogen and dissolved ion concentrations were measured in the groundwater from 15 wells. Along the flow of groundwater in each topographical surface, the relationship among the changes of dissolved ion concentrations, nitrogen-isotopic compositions, land use and position of the area with sewerage system were also examined. As a result, it was suggested that chemical fertilizer and domestic waste have an influence on the groundwater quality in a part of the researching area. Also it was suggested that the rise of nitrogen-isotopic compositions with the flow of groundwater in the part of the researching area should be attributed to the denitrification.

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