白旗源泉
Shirahata Spring- Color
- colorless and clear
- Taste
- not recorded
- Odor
- hydrogen sulfide odor present
Hydrogen-Aluminum Sulfate-Chloride spring
- Hydrogen H⁺
- makes the water acidic — sharp and bactericidal.
- Sulfate SO₄²⁻
- "gypsum / Glauber's salt" — vessels and wound healing.
- Skin conditionsatopic skin, eczema
- Circulationtired legs
- Aches & jointsstiff shoulders
- Sensitive-skin cautionbroken or dry skin
The Shirahata source at Kusatsu — a strongly acidic, sulfur-bearing aluminium sulfate-chloride spring of the hydrogen sulfide type. At pH 2.0 it is sharp enough to sting slightly on contact; the water runs colorless and clear at the wellhead yet carries an unmistakable rotten-egg note of hydrogen sulfide. Hydrogen ions alone make up more than a third of the cation balance, which is where the bite comes from, while an unusually generous 240.6 mg/kg of metasilicic acid leaves a thin silica film that takes some of the edge off. Dissolved solids of 1,780 mg/kg put it in moderately mineralized territory, with sulfate and chloride providing the body.
Sampled at wellhead·Analyzed Jul 25, 2023·一般社団法人 群馬県薬剤師会（環境衛生試験センター）