Japan Geoscience Union Meeting 2018

Presentation information

[EE] Oral

A (Atmospheric and Hydrospheric Sciences) » A-HW Hydrology & Water Environment

[A-HW22] Hydrological Cycle and Water Environment

Thu. May 24, 2018 3:30 PM - 5:00 PM 104 (1F International Conference Hall, Makuhari Messe)

convener:Seiya Nagao(Institute of Nature and Environmental Technology, Kanazawa University), Isao Machida(Geological Survey of Japan), Shin'ichi Iida(国立研究開発法人森林研究・整備機構森林総合研究所森林研究部門森林防災研究領域水保全研究室, 共同), Takeshi Hayashi(Faculty of Education and Human Studies, Akita University), Chairperson:Machida Isao(Geological Survey of Japan, AIST), Nagao Seiya(Institute of Nature and Environmental Technology, Kanazawa University), Hayashi Takeshi(Faculty of Education and Human Studies, Akita University), Iida Shin'ichi(Forestry and Forest Products Research Institute)

3:30 PM - 3:45 PM

[AHW22-18] Investigating trends of hydrogen peroxide in Ohta and Kurose rivers and rainwater in Hiroshima prefecture, Japan

*Waqar Azeem Jadoon1, Ryuta UEKI2, Kazuhiko TAKEDA1, Hiroshi SAKUGAWA1 (1.Graduate School of Biosphere Science, Hiroshima University, Japan, 2.School of Integrated Arts and Sciences, Hiroshima University, Japan)

Keywords:Hydrogen peroxide, River water, Rainwater, Hiroshima prefecture

Hydrogen peroxide (H2O2) plays a significant role in advanced oxidation process to remove the pollutants from water systems. However, its excess concentration in water has been proven detrimental for many of aquatic life forms under laboratory conditions. For this purpose we determined H2O2 distribution in river water (Ohta River: six sites = OR2–OR7 and Kurose River: KR1–KR3, Saijo A, Saijo B, Shitami A and Shitami B) and precipitation (rain and snow at Hiroshima University Higashihiroshima campus) from Hiroshima prefecture, Japan. In both rivers, H2O2 concentrations varied spatially with it’s increasing concentrations from upstream (sites: KR1 and KR2; OR2 and OR3) to mid/downstream (K3; OR6 and OR7). The H2O2 concentrations ranged between 67–175 nM and 21–195 nM in Ohta and Kurose rivers, respectively. The H2O2 ranged from 1.91 μM to 4.23 μM in rainwater and was 0.61 μM in snow samples. The H2O2 concentrations at mid/downstream sites in both rivers could be related with anthropogenic activities. For example at two branches of Kurose River (Shitami A and Shitami B) elevated H2O2 may be the result of untreated domestic wastewater discharge and agricultural runoff in these streams. Additionally, rainfall also increased the H2O2 levels at Shitami A and Shitami B, when measured one hour after rainfall started. In Kurose River higher levels of H2O2 were recorded during October compared with H2O2 values reported for December month. The H2O2 concentrations correlated well with the water temperature (r2=0.66; p < 0.001, n=14) and fairly with solar radiation (r2=0.41; p < 0.05, n=14) in Kurose River. This study suggested that these two parameters are important in determining the H2O2 levels in Kurose River. However, in Ohta River and rainwater, no significant correlation of H2O2 with water temperature, solar radiation and dissolved carbon was observed, which could be due to scarcity of available data.