• The Journal of Engineering Geology
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• v.26 no.4
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• pp.561-570
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• 2016

For the investigation of hydrochemical changes in hot spring waters from the Onyang hot spring area, we analyzed water chemistry of 24 hot spring waters in 2011 and 2016. The results showed that there is no significant change in temperature and properties of the hot spring waters. The relationship of 2016 between temperature and $SiO_2$ and F reveals a positive trend ($r^2=0.60$, 0.47), and the relationship between temperature and Ca, Mg, Cl, $SO_4$, $HCO_3$, EC reveals a negative trend ($r^2=0.50$, 0.11, 0.50, 0.63, 0.23, 0.51). The relationship between temperature and pH is a positive trend, while the one between temperature and DO is a negative trend, indicating that the source is from deep groundwater. When plotted on Piper diagram, most of which are $Na-HCO_3$ but several hot waters are classified as the $Na(Ca)-HCO_3$, indicating inflow of shallow groundwater was occurred.

• Journal of the Korean Chemical Society
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• v.14 no.1
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• pp.75-83
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• 1970

66 samples of underground waters at the town Onyang were collected and analyzed from August 19 to November 5, 1969. Fluorine more than 1.0 mg/l is contained in the under ground waters in the region 0.9 km away from the Onyang hot springs, fluorine more than 0.3 mg/l in the waters in the region 1.2 km away from the hot springs, and 0.04-0.29 mg/l fluorine in the waters in the region from 1.2 km to 3.9 km away from the hot springs. It is advisable that the residents in their teeth growing ages must not drink the underground waters in the region 1.2 km away from the hot springs because the waters cause dental trouble (mottled teeth) and they may drink the waters in the region from 1.2 km to 3.9 km away from the hot springs for the fluoridation of their teeth. It is reasonable to suppose that the high fluorine contents of the underground waters are caused mainly by the contamination of the hot spring waters in which fluorine and calcium in rock are dissolved, in the region 1.2 km away from the hot springs, and that the waters in the region from 1.2 km to 3.9 km away from the hot springs contain much fluorine produced by the decomposition of organic substances.