藤七温泉
Toshichi OnsenOperated by · 株式会社だんぶり
黄
Sulfur
Classification
Calcium Sulfate spring
A simple sulfur spring of the hydrogen sulfide subtype, welling up at 87 °C from one of Japan's hottest natural sources high in the Hachimantai mountains. At the source the water is milky-white and faintly turbid, carrying the unmistakable rotten-egg note of H₂S. It runs weakly acidic at pH 3.7, with lightly mineralized chemistry (177 mg/kg dissolved solids) but a clear sulfur signature — free H₂S at 4.12 mg/kg and free CO₂ at 52.9 mg/kg. Classified under the older name 'tanjun ryūkasuiso-sen' (simple hydrogen sulfide spring), it's the kind of high-mountain sulfur water that needs no dilution or reheating to bathe in.
pH
3.70
Weakly acidic
Source temperature
87.0°C
Hot
Tonicity
0.18g/kg
Hypotonic
Free CO₂
53mg/kg
Low
Free H₂S
4.12mg/kg
High
- Color
- white, slightly turbid
- Odor
- hydrogen sulfide
Highlights
- Sulfur-rich
- Top-decile hot
Analyzed Aug 23, 2016·公益財団法人 秋田県総合保健事業団 児桜検査センター·Cert no. No.28-07-77-003
