4号源泉
Bessho Onsen Spring No. 4Operated by · 別所温泉財産区
Sampled at wellhead
黄
Sulfur
Classification
Sodium Sulfate-Chloride spring
An alkaline simple-sulfur spring drawn at 50.9 °C — high-temperature class. The water is near-colorless and clear at the wellhead but carries an unmistakable hydrogen sulfide note, and the 12.4 mg/kg of HS⁻ comfortably clears the sulfur-spring threshold. At pH 8.8 it sits in the alkaline band, soft on the skin in the classic Bessho beauty-water style.
pH
8.80
Alkaline
Source temperature
50.9°C
Hot
Tonicity
0.33g/kg
Hypotonic
Free H₂S
0.20mg/kg
Low
- Color
- nearly colorless and clear
- Odor
- with a hydrogen sulfide note
Highlights
- Sulfur-rich
Analyzed Jul 5, 2004·長野県環境保全研究所