Japanese Journal of Limnology (Rikusuigaku Zasshi)

In Memoriam Shinkichi YOSHIMURA

Masuzo UÉNO

1968 Volume 29 Issue 3 Pages 105-110
Published: October 28, 1968
Released on J-STAGE: October 16, 2009

DOIhttps://doi.org/10.3739/rikusui.29.3_105

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Methylene blue active substances in the water of Lake Suwa

Yoshinari AMBE, Takahisa HANYA

1968 Volume 29 Issue 3 Pages 111-118
Published: October 28, 1968
Released on J-STAGE: October 16, 2009

DOIhttps://doi.org/10.3739/rikusui.29.3_111

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Pollution of the water of Lake Suwa owing to alkylbenzenesulphonate (ABS) from the municipal waste waters was investigated in the summer of 1967 (June 8 and July 30). The results of the analysis of ABS according to the methylene blue method were determined as methylene blue active substances (MBAS), in this study.
1). As shown in fig. 1 and fig. 2 the content of MBAS was high in the northern half of the lake, especially along the coast of Suwa and Okaya, where inflows of waters highly polluted with ABS were found.
2). The contents of MBAS and COD showed no significant relationship, the high value of COD in the surface water of the lake is considered to be caused from the decomposition of planktons blooming at that time.
3). From the calculations of the budget of MBAS in this lake, it is concluded that considerable amounts of ABS must have been adsorbed and deposited on the bottom mud of the lake.
4). Accompanying to ABS, 515 tons of phosphate-P, which was contained in the detergent as a component of builder, was estimated to have been supplied into the lake every year. The inflow of such amount of phosphate plays an important role in the progressing eutrophication of this lake.

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Erratum

1968 Volume 29 Issue 3 Pages 118
Published: 1968
Released on J-STAGE: October 16, 2009

DOIhttps://doi.org/10.3739/rikusui.29.3_118

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Diatoms in the upper stream of the Yoshino-river, near the village Ikadaba (I)

Katsumi UEDA

1968 Volume 29 Issue 3 Pages 119-125
Published: October 28, 1968
Released on J-STAGE: October 16, 2009

DOIhttps://doi.org/10.3739/rikusui.29.3_119

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[in Japanese]

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Geochemical Investigations of Confined Ground Water in South Yamagata District

Takeo KATO, Isamu SHIDA

1968 Volume 29 Issue 3 Pages 126-136
Published: October 28, 1968
Released on J-STAGE: October 16, 2009

DOIhttps://doi.org/10.3739/rikusui.29.3_126

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“South Yamagata District” occupies the left bank area of the Su-gawa River in the southernmost part of Yamagata Basin. This district is underlain by the confined aquifer in a moderate depth and therefore has received ample water supplies from flowing wells which can be drilled easily. In the present paper, the features of the ground water mentioned above are discussed from the geochemical point of view.
Judging from the quality-of-water, the ground water here is characterized by the high content of sulfate ion. Stochastical calculations reveal that the confined aquifer here is supplied with the water of the Su-gawa River and the ground water under pressure flows northwards.

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