龍神小又川温泉
Ryujin Komatagawa OnsenOperated by · 龍神小又川温泉開発有限会社
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Bicarbonate
- Color
- colorless and clear
- Taste
- tasteless
- Odor
- odorless
Sodium Bicarbonate spring
pH 8.7Weakly alkalineCold mineral source · 20°C
Composition fingerprint0.7 g/kg dissolved · Hypotonic
Na⁺98
HCO₃⁻77
CO₃²⁻12
◀ CationsAnions ▶
- Sodium Na⁺
- salt's cation — pairs with chloride to make the water salty.
- Bicarbonate HCO₃⁻
- "soda" — softens skin, leaves it smooth.
Known good for
- Smooth skindry, rough skin
- Recoveryfatigue, stress
A sodium-bicarbonate-led cold-mineral spring at 19.5 °C (below the 25 °C threshold for a thermal source), heated for bathing. Weakly alkaline at pH 8.6–8.7, it carries the soft, slippery touch of Japan's beauty-water family even though mineralization is light at 712 mg/kg. The certificate notes bubbles forming at the wellhead. The lab classifies it as an onsen under the Hot Springs Act on fluoride and sodium-bicarbonate content, but it does not meet the stricter 'therapeutic spring' (ryōyōsen) thresholds, so no formal spring-quality name is assigned.
Sampled at wellhead·Analyzed Dec 14, 2015·和歌山県環境衛生研究センター·Cert no. 温泉第1064号