大分市丹生温泉施設
Oita City Nyu Onsen Facility SpringSampled at mixing tank
塩
Chloride
+ Bicarbonate
Classification
Sodium Chloride-Bicarbonate spring
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.
pH
7.40
Neutral
Source temperature
50.1°C
Hot
Tonicity
5.12g/kg
Hypotonic
Free CO₂
7.00mg/kg
Low
- Color
- very faintly yellow and clear
- Taste
- slightly salty
- Odor
- faint mineral note
Highlights
- High silica
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