Elucidation of causes of generation of poor oxygen water bodies other than decomposition of organic matter: Development of practical new technology for reducing substance measurement

2017 Fiscal Year Final Research Report

• Project/Area Number: 15K18729
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Aquatic bioproduction science
• Research Institution: Fisheries Research and Education Agency
• Principal Investigator: Tokunaga Takahisa 国立研究開発法人水産研究・教育機構, 西海区水産研究所, 研究員 (50404009)
• Project Period (FY): 2015-04-01 – 2018-03-31
• Keywords: 酸素消費 / 有明海

Outline of Final Research Achievements

The purpose of this study was to establish a simple method to directly measure the effect of reducing substances on the formation of deficient-oxygen water mass and to examine the cause of formation of deficient-oxygen water mass in the Ariake Sea from the viewpoint of oxygen consumption. In order to quantitatively evaluate the oxygen consumption by hydrogen sulfide among the oxygen consumption which plays an important role in the formation of the deficient-oxygen water mass, the effect of mercuric chloride (II) was verified by laboratory experiments. In addition, as a result of field experiments, the importance of chemical oxygen consumption, in particular oxygen consumption of hydrogen sulfide was suggested. Furthermore, it was suggested that the proportion of oxygen consumption of hydrogen sulfide greatly varies depending on the dissolved oxygen concentration at the start of the experiment.

Free Research Field

沿岸環境学