Yufuin Tsukanoma no Yu
Analysis UnverifiedNear the foot of Mount Yufu, this spring bursts unaided from almost 500 m down at close to boiling. Clear as it emerges, it shifts to pale and milky blue in air and light. Salty and alkaline, it clings slipperily to the skin, and its saline film holds warmth long after bathing.
The bar length shows how abundant each component is compared to thresholds that make it "distinctive" (therapeutic spring standards, beauty spring criteria, etc.).
A natural moisturizer also used in skincare lotions. Forms a thin veil on the skin to reduce moisture loss after bathing.
A trace component with gentle antibacterial and anti-inflammatory action.
Scores are calculated from mineral analysis data based on the Mineral Spring Analysis Guidelines (Ministry of Environment, Japan). They are unrelated to facility atmosphere or service quality.
▸Note
The temperature, pH and component values shown here are based on the hot spring analysis (source). Actual values in the bath may differ depending on heating, dilution, recycling and filtration. Please check current usage status at the facility.
The source is 97.4°C, so check the temperature and keep away from the inlet. Chloride water warms you fast, so short soaks suffice; at pH 8.6 it lifts oils, so moisturize afterward.
With 413.0 mg/kg chloride, the salty water forms a thin film that seals in heat for restorative warmth, while pH 8.6 alkalinity and 156.0 mg/kg metasilicic acid help leave silky skin.
The 97.4°C source can scald near inlets and pipes. It warms strongly, so avoid long soaks, skip bathing when unwell or after alcohol, and stay hydrated.
※ See the analysis data below for detailed contraindications
ANALYSIS DATAView all analysis fields ▼
Source Info
- Source name
- Yufuin Tsukanoma no Yu
- Spring type
- Sodium Chloride Spring
- Old spring type name
- 純食塩泉
- Source temperature
- 97.4℃
- pH
- 8.6
- Flow type
- 自噴
- Osmotic pressure
- 低張性
Analysis Document
- Analysis date
- 2017-10-12
- Analyst organization
- 公益社団法人大分県薬剤師会（大分県薬剤師会検査センター）
- Registration No.
- 大分県第3号
Cations
- Lithium ion Li⁺
- 1.7 mg/kg
- Sodium ion Na⁺
- 374 mg/kg
- Potassium ion K⁺
- 28.4 mg/kg
- Ammonium ion NH₄⁺
- 0.20 mg/kg
- Magnesium ion Mg²⁺
- 0.70 mg/kg
- Calcium ion Ca²⁺
- 6.3 mg/kg
- Aluminum ion Al³⁺
- 0.30 mg/kg
- Lead ion Pb²⁺
- < 0.01 mg/kg
- Strontium ion Sr²⁺
- 0.20 mg/kg
- Copper ion Cu²⁺
- < 0.05 mg/kg
- Cadmium ion Cd²⁺
- < 0.001 mg/kg
- Total cations
- 0.41 mg/kg
Anions
- Fluoride ion F⁻
- 1.3 mg/kg
- Chloride ion Cl⁻
- 413 mg/kg
- Thiosulfate ion S₂O₃²⁻
- 0.30 mg/kg
- Sulfate ion SO₄²⁻
- 97.6 mg/kg
- Bicarbonate ion HCO₃⁻
- 112 mg/kg
- Carbonate ion CO₃²⁻
- 34.8 mg/kg
- Bromide ion Br⁻
- 1.2 mg/kg
- Total anions
- 0.66 mg/kg
Undissociated Components
- Sulfuric acid H₂SO₄
- 0.00 mg/kg
- Phosphoric acid H₃PO₄
- 0.00 mg/kg
- Arsenious acid HAsO₂
- 0.30 mg/kg
- Metasilicic acid H₂SiO₃
- 156 mg/kg
- Metaboric acid HBO₂
- 9.1 mg/kg
- Total undissociated
- 0.17 mg/kg
Dissolved Gas
- Free carbon dioxide CO₂
- 0.00 mg/kg
- Free hydrogen sulfide H₂S
- 0.00 mg/kg
- Total dissolved gas
- 0.00 mg/kg
Trace Components
- Radon Rn
- < 7.4 Bq/kg
Totals
- Total dissolved substances
- 1.2 mg/kg
- Component total
- 1.2 mg/kg
- Evaporation residue
- 1.4 mg/kg
Usage
- Heating
- No
- Dilution
- No
- Recycle / Filter
- No
- Additives
- No
- Disinfection
- No
Indications & Contraindications
- Bathing indications
- Cuts and grazes, Peripheral circulatory failure, Poor circulation, Depression, Xeroderma
- General indications
- High blood pressure (mild), Rheumatoid arthritis, Autonomic instability, Insomnia, Chronic pain or stiffness in muscles and joints, Muscle stiffness due to motor paralysis, Gastrointestinal dysfunction
- Contraindications
- Acute illness (especially with fever), Active tuberculosis, Malignant tumors, Severe heart disease, Respiratory failure, Renal failure, Bleeding disorders, Severe anemia, Any actively progressing illness, Pregnancy (especially early and late stages)
Drinking
- Drinkability
- Not drinkable
