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Water quality of the Hirase river and nitrogen purification experiment

Student(s):Haruka Nakagawa, Yuki Murata, Io Otake, Teruzumi Yamamoto, Akihito Ueno, Yuta Kido, Kousei Yamamoto
Grade Level:Secondary School (grades 9-12, ages 14-18)
GLOBE Teacher:Reiko Nezu
Contributors:Reiko Nezu
Report Type(s):International Virtual Science Symposium Report
Protocols:pH, Nitrates
Presentation Poster: View Document
Optional Badges:Be a Data Scientist
Date Submitted:03/03/2020
We, Ikuta High School Science Club, have been conducting water quality surveys of the Hirase River near the school since 2017. We are investigating water temperature, pH, COD,NH4+, NO2-, and NO3- . Our research question is how the effects of climate, river topography, and river vegetation affect water quality. This year, we set a new goal to test whether aquatic plants are effective at purifying nitrogen. We use pack tests to conduct water quality studies and to determine the absorption of ions by plants. In addition, we made a map of the surrounding area by walking about 4 km from the water source of the Hirase River to the school in order to examine the state of the surrounding terrain. As a result of this study, it was found that the water quality of the Hirase River was related to precipitation and agricultural land. And that aquatic plants were effective in purifying nitrogen. We will continue to conduct water quality surveys and we want to work on experiments to improve water quality.