Electrical Conductivity as an Indicator to Assess the Suitability of River Water for Recreational Use
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- Horiguchi Hanna
- Division of Health Sciences, Graduate School of Medicine, Osaka University, Suita, Japan
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- Shigemura Katsumi
- Department of Public Health, School of Medicine, Faculty of Health Science, Kobe University, Kobe, Japan Department of Urology, Kobe University Hospital, Kobe, Japan
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- Kitakawa Madoka
- Department of Biology, Graduate School of Science, Kobe University, Kobe, Japan
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- Nakazawa Minato
- Department of Public Health, School of Medicine, Faculty of Health Science, Kobe University, Kobe, Japan
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- Noyori Tatsuhiko
- Toga River Conservancy, Kobe, Japan
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- Inoue Motomu
- Department of Biology, Graduate School of Science, Kobe University, Kobe, Japan
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- Onishi Reo
- Department of Public Health, School of Medicine, Faculty of Health Science, Kobe University, Kobe, Japan
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- Moriwaki Michika
- Department of Public Health, School of Medicine, Faculty of Health Science, Kobe University, Kobe, Japan
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- Yoshimura Chisato
- Center for Environmental Management, Kobe University, Kobe, Japan
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- Kobayashi Mayumi
- Department of Biology, Graduate School of Science, Kobe University, Kobe, Japan
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- Suzaki Toshinobu
- Department of Biology, Graduate School of Science, Kobe University, Kobe, Japan
抄録
<p>Urban rivers flowing through cities are places of recreation and relaxation for citizens. However, these rivers are sometimes contaminated by Escherichia coli (E. coli). Therefore, the purpose of this study was to develop a simple method to investigate E. coli contamination in river water. From May to October 2019, water samples were collected from five locations in the Toga River in Kobe City, Japan, and the fecal coliform density (FCD) was measured, along with the electrical conductivity and the chloride ion concentration of the river water. Comparison of these water quality parameters with actual fecal coliform densities revealed a high correlation between electrical conductivity and FCD. Whereas, little correlation was found between FCD and chloride concentration. Receiver operating characteristic (ROC) analysis was used to evaluate the method that uses the electrical conductivity as an estimating parameter. The area under the curve (AUC) was used as a measure of the performance of the ROC curve algorithm. The calculated AUC value stayed high, above 0.95, over a wide range of FCD values, suggesting that this rapid monitoring method is appropriate for assessing the quantity of contaminating fecal coliforms in the range higher than 300/100 mL.</p>
収録刊行物
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- Journal of Water and Environment Technology
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Journal of Water and Environment Technology 21 (4), 204-212, 2023
公益社団法人 日本水環境学会
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詳細情報 詳細情報について
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- CRID
- 1390015653818708480
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- ISSN
- 13482165
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- Crossref
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- 抄録ライセンスフラグ
- 使用不可