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タイトル: Quality of Groundwater from Open-Wells in Rural and Peri-Urban Areas of Unguja Island, Zanzibar, Tanzania
著者: SHEIKH, Mohammed Ali
ALI, Ali Habib
KHAMIS, Aflah Abeid
RASHIDI, Rashidi Juma
ALI, Hassan Rashid
IKENO, Jun
TANAKA, Ueru
キーワード: Water quality
Groundwater
Heavy metals
Nitrate
Zanzibar
発行日: Mar-2018
出版者: The Research Committee for African Area Studies, Kyoto University
誌名: African study monographs. Supplementary issue.
巻: 55
開始ページ: 119
終了ページ: 142
抄録: Water quality is one among the most important environmental issues these decades. Heavy metals receive a particular concern among the wide diversity of chemicals causing environmental degradation including groundwater. Nitrate, as well, is an indicator of human-induced groundwater contamination. This study investigated the levels of toxic heavy metals such as Cd, Cu, Pb, Co and Cr, and nitrate (NO3 –) contained in the water from 116 openwells in rural and peri-urban areas of Unguja Island, Zanzibar. The average values of the heavy metals were as follows: 1.359 ± 3.419 μg L–1 for Cr; 0.052 ± 0.109 μg L–1 for Co; 0.238 ± 0.533 μg L–1 for Cu, 0.001 ± 0.004 μg L–1 for Cd; and 0.003 ± 0.026 μg L–1 for Pb. Referring to Water quality standard in Japan (MHLW), Water quality guideline by WHO and Quality of Drinking Water Supplies (EWURA), the results suggest no serious acute problem of heavy metal contamination so far. The average value of the nitrate (NO3 –) was 36.1 ± 58.85 mg L–1. The nitrate contamination, some of which exceeded the values of permissible standards for safe drinking waters by MHLW and WHO, however, should not be underestimated.
著作権等: Copyright by The Center for African Area Studies, Kyoto University, March 1, 2026.
DOI: 10.14989/230167
URI: http://hdl.handle.net/2433/230167
出現コレクション:55(Resources Vitalizing Local Societies in Tanzania)

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