大分市丹生温泉施設
Oita City Nyu Onsen Facility Spring塩
Chloride
+ Bicarbonate
- Color
- very faintly yellow and clear
- Taste
- slightly salty
- Odor
- faint mineral note
Sodium Chloride-Bicarbonate spring
pH 7.4NeutralHot source · 50°CHigh silica
Composition fingerprint5.1 g/kg dissolved · Hypotonic
Na⁺91
Cl⁻79
HCO₃⁻20
◀ CationsAnions ▶
- Sodium Na⁺
- salt's cation — pairs with chloride to make the water salty.
- Chloride Cl⁻
- table-salt anion — coats the skin and holds heat in.
Known good for
- Warmingcold sensitivity
- Aches & jointsstiff shoulders
- Smooth skindry, rough skin
A sodium-led chloride spring with bicarbonate softness layered in, surfacing hot at 50.1 °C (historically classed as a soda-salt spring). It is neutral in pH, slightly salty with a faint mineral note, and carries a very faint yellow tint at the source. A generous 157 mg/kg of metasilicic acid leaves the kind of thin silica film that makes skin feel smoother afterwards.
Sampled at mixing tank·Analyzed Jan 23, 2023·公益社団法人大分県薬剤師会検査センター·Cert no. 大薬検 第7R-23010016号