七操の湯
Nanamisao no Yu SpringOperated by · 横湯細惣代 児玉秀樹
Sampled at bath inlet
硫
Sulfate
+ Chloride
Classification
Sodium-Calcium Sulfate-Chloride spring
A sodium-calcium spring led by sulfate with a chloride sub-type — sulfate gives quiet body, chloride adds a salty edge to the heat-retaining feel. Hot at the wellhead (50.5 °C), neutral in pH, and visually almost colourless with only a faint salty note. Moderately mineralized at 1,418 mg/kg dissolved solids, and notably rich in metasilicic acid (153.8 mg/kg) — that silica leaves a thin moisturising film that makes the water sit smoothly on the skin. A naturally welling source at Yokoyu in Yamanouchi.
pH
7.30
Neutral
Source temperature
50.5°C
Hot
Tonicity
1.42g/kg
Hypotonic
Free CO₂
8.10mg/kg
Low
- Color
- nearly colorless and clear
- Taste
- with a slightly salty edge
- Odor
- odorless
Analyzed May 26, 2016·一般社団法人 上田薬剤師会 検査センター·Cert no. 中28-4 (No.42)