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Volume 6, Issue 3
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Ken SUGAWARA1936 Volume 6 Issue 3 Pages 95-101
Published: September 30, 1936
Released on J-STAGE: June 12, 2009
JOURNAL FREE ACCESS1) The changes of the densities of the waters from Lake Takasukanuma, which were caused by the dissolution of gases, have been calculated from the data of gas-analysis of the waters (Table 1) and the ÅNGSTRÖM'S coefficients of dilatation by absorption (Table 2), using HORIITPI's equation of density-change by absorption.
2) The results show that,
a) Except carbon dioxide, all kinds of dissolved gases are distributed in such a way that deeper lying waters tend to become lighter than upper lying ones. So the total decrease of density due to the dissolved gases and the gradient of its vertical change become larger as it goes deeper, while they attain their maximum in October 20th and become smaller as time advances.
b) Parallelism is evident when we compare these results with the data of the measurement of the densities of waters, which were reported in my previous paper (1).
3) Thus the decrease of density in the deepest water reported is explained partly by the dissolution of gases. But, as the amount of decrease due to the dissolved gases does not exceed 10% of the total decrease, the full explanation is hoped to be obtained along some other lines. Studies are being continued further along them.View full abstractDownload PDF (266K) -
Ken SUGAWARA1936 Volume 6 Issue 3 Pages 102-115
Published: September 30, 1936
Released on J-STAGE: June 12, 2009
JOURNAL FREE ACCESS1) Two sets of bottles were suspended in Lake Takasukanuma, one at the depth of 1 m above the bottom and the other 2.5 m. At in tervals of some 20-30 days the contents of the bottles were examined. The results reported here cover June 23rd, 1935- Jan. 19th, 1936, and their full description in English will be published after the completion of these studies.
2) The deposits increase in weight from early summer (some 4.2 mg dry weight per cm2 per day) towards the end of autumn. They attain their maximum (some 10.5 mg) during the period Nov. 11th-Dec. 15th, while they decrease suddenly to their minimum (0.79mg) during the period Dec. 26th-Jan. 19th.
3) From the vartical veriation in the chemical composition of the deposits reported in my previous paper (1), and from the data of the chemical analysis of the freshly precipitated deposits (tables 1 and 2), it is concluded that more than 45% of the deposited nitrogen dissolves again into the main body of water after its precipitaion, and more than 34% of carboneous deposits, represented as the loss of ignition, disap pears through fermentation.
4) The comparison of the ratios of Mn2O3 to Fe2O3, respectively in the mud, in the freshly precipitated deposits and in the supernatant water in the bottle for collection of deposits, confirms the author's conviction that the deposited manganese tends to dissolve more easily than iron due to the higher oxido-reduction-potential of the former.View full abstractDownload PDF (547K) -
Masajiro YAMADA1936 Volume 6 Issue 3 Pages 116-128
Published: September 30, 1936
Released on J-STAGE: December 11, 2009
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Eiichirô FUKUI1936 Volume 6 Issue 3 Pages 129-135
Published: September 30, 1936
Released on J-STAGE: June 12, 2009
JOURNAL FREE ACCESSDownload PDF (335K) -
Ken SUGAWARA1936 Volume 6 Issue 3 Pages 136-138
Published: September 30, 1936
Released on J-STAGE: June 12, 2009
JOURNAL FREE ACCESSDownload PDF (114K)
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