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長崎市内における河川の汚濁状況調査-1 : 中島川における有機物と合成洗剤による汚濁の状況


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Title: 長崎市内における河川の汚濁状況調査-1 : 中島川における有機物と合成洗剤による汚濁の状況
Other Titles: Studies on Pollution of Rivers in Nagasaki City―I Status of Pollution Caused by Organic Substances and Synthetic Detergents in the Nakashima River
Authors: 保田, 正人 / 中原, 俊治 / 奥田, 正 / 名切, 徹 / 森永, 繁則 / 釘田, 芳文 / 原, 研治 / 槌本, 六良 / 石原, 忠
Authors (alternative): Yasuda, Masato / Nakahara, Toshiharu / Okuda, Tadashi / Nakiri, Tooru / Morinaga, Shigenori / Kugita, Yoshifumi / Hara, Kenji / Tsuchimoto, Mutsuyoshi / Ishihara, Tadashi
Issue Date: Feb-1979
Publisher: 長崎大学水産学部
Citation: 長崎大学水産学部研究報告, v.46, pp.23-30; 1979
Abstract: BOD (Biochemical Oxygen Demand) and MBAS (Methylene Blue Active Substance) in the Nakashima River were measured for four years from April 1974 to March 1978, to determine the status of pollution caused by organic substances and synthetic detergents. The results obtained were as follows. 1) BOD showed a high value in 1974, while it decreased remarkably in 1975 and showed a gradual decrease thereafter. These yearly changes were statistically significant. 2) The yearly changes of MBAS concentration were not observed during the first three years, while a remarkable decrease was noticed in 1977, as compared with the other years. These facts indicated that the pollution in this river caused by synthetic detergents decreased yearly. 3) BOD and MBAS concentration showed the seasonal variations with the tendency of being low in summer and high in winter. 4) BOD and MBAS concentration showed a significant positive correlation in each year and the correlation coefficient showed the tendency to increase annualy. Moreover, each of regression line at four different hours (8, 11, 14 and 17 o'clock) between BOD and MBAS concentration showed the tendency to correspond yearly. In view of these facts, it was considered that the source of main pollution in this river recently was domestic waste water. 5) Any significant correlation was hardly noted between BOD and the amount of flow in the river or the rain quantity. Moreover, the relation between MBAS concentration and the amount of flow or the rain quantity showed the same tendency as between BOD. According to these facts, it was considered that the seasonal variations of both BOD and MBAS concentration were caused by seasonal changes of waste water.
URI: http://hdl.handle.net/10069/30648
ISSN: 05471427
Type: Departmental Bulletin Paper
Text Version: publisher
Appears in Collections:第46号

Citable URI : http://hdl.handle.net/10069/30648

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