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No.16(2005) >

Please use this identifier to cite or link to this item: http://hdl.handle.net/10087/8998

Title: 湧水の水質特性と地質(岩種)の関係
Other Titles: An  Analytic aSltudy to Clarif tyhe Relatio nbetween the Qualit oyf  Flowing Water and  the  Location’s Geology
Authors: 椛沢, 龍次郎
Kabasawa, Ryujiro
Keywords: 水質
Water quality
Nature of soil
Basic rocks
Sulfate ion
Issue Date: 6-Dec-2005
Citation: 桐生短期大学紀要16, 7-11
Series/Report no.: 桐生短期大学紀要;
Abstract: 特異性を有するとされる埼玉県日本水・風布川の水質を分析し,その地域の地質との関係を調査した.また,前稿で報告した隣接する群馬県赤城山麓の湧水との比較を行い,水質と地質との関連性について検討を行った.日本水は,マグネシウムイオン(Mg^<2+>)を大量に含み,その量は陽イオンの約70%(17.0mg/1)を占めていた.Mg^<2+>イオン濃度は約5倍に達していた.赤城山麓湧水と比較してみると,水質のタイプはMg-HCO_3型で,通常見られる赤城山麓湧水の水質タイプCa-HCO_3型とは異なる水質であった.さらに,SiO_2濃度は少し低めで,電気伝導度は370μs/cmで高めであった.また,pHは8.4と高く弱アルカリ性を示した.これらの結果は,外秩父山地の釜伏山周辺の地質が結晶片岩や御荷鉾緑色岩類からなり,Mgを多く含有する蛇紋岩の割れ目から湧出することが大きく影響しているものと考えられる.これに加え,日本水の湧出する地質がSiO_2をあまり含まない変成岩類で化学組成に富む超塩基性岩であることに起因することも考えられる.また,陰イオンのうち,硫酸イオン(SO_4^<2->)濃度が風布川流域で特に高い傾向が見られ,東部都市部からの影響が懸念される.The purpose of this study is to clarify the relation between water quality and the nature of the soil. The previous report showed the above relation at the foot of Mt. Akagi in Gunma prefecture. In the present paper, the relation between Yamatomizu from Fuppu river and the geology of the related area at Saitama Prefecture was described. Moreover the water quality of Yamatomizu was compared with the water at the foot of Mt. Akagi. Yamatomizu contained a large number of Mg^<2+> (about 70%, 17.0mg/l, of the cation). In comparison with the water at the foot of Mt. Akagi, Mg^<2+> concentration was 5 times higher, SiO_2 concentration was a little lower, electric conductivity (370μs/cm) was a little higher, and pH (8.4) was higher. The Yamatomizu showed the Mg-HCO_3 type of water quality which differs from the water of Ca-HCO_3 type at the foot of Mt. Akagi. The related area of Yamatomizu located in the periphery of Mt. Kamafuse at the outer zone of the Chichibu Mountains mainly consisted with crystalline schist and mikabo green stone. From these results, it is considered that a high concentration of Mg^<2+> in Yamatomizu resulted from the flowing water running through Mg rich serpentinite, in addition to this, the nature of soil related Yamatomizu consisted with metamorphic rocks containing a few SiO_2 called ultra-basic rocks. There is a deep concern that a higher concentration of SO_4^<2-> may have an effect on air pollution in Tokyo.
URI: http://hdl.handle.net/10087/8998
ISSN: 13424076
Appears in Collections:No.16(2005)

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