Zao Nigorikawa no Yu
Analysis UnverifiedTogatta Onsen is said to date back to the early Edo period, growing along the Matsukawa River that flows from the Zao range. This high-temperature well holds 296.0 mg of sodium, with bicarbonate (320.3 mg), sulfate (224.5 mg) and chloride (196.9 mg) in nearly equal shares. With 117.2 mg of metasilicic acid it feels silky on the skin. Wrapped in brown mineral flakes, it is like a quiet, wise elder of the forest.
The bar length shows how abundant each component is compared to thresholds that make it "distinctive" (therapeutic spring standards, beauty spring criteria, etc.).
A trace component with gentle antibacterial and anti-inflammatory action.
A natural moisturizer also used in skincare lotions. Forms a thin veil on the skin to reduce moisture loss after bathing.
Absorbed through the skin to gently promote peripheral circulation.
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.
At 72.3°C the source is very hot, so water is added in the tubs. Test the temperature by hand, especially near the inflow. At neutral pH 7.0 it is gentle; rinse lightly afterward to keep the warming, moisturizing feel.
Chloride (196.9 mg) helps hold heat in the skin while sulfate (224.5 mg) supports circulation, giving restorative warmth after bathing. Together with silky bicarbonate (320.3 mg), it invites deep relaxation.
The source is very hot, so beware of scalding near the inflow. Avoid long soaks to prevent dizziness or dehydration, and keep baths short if you have acute illness or heart or blood pressure concerns. Drinking is not permitted.
※ See the analysis data below for detailed contraindications
ANALYSIS DATAView all analysis fields ▼
Source Info
- Source name
- Zao Nigorikawa no Yu
- Spring type
- Sodium Chloride, Bicarbonate and Sulfate Spring (Hypotonic Neutral high-temperature hot spring)
- Old spring type name
- 含重曹・芒硝－食塩泉
- Source temperature
- 72.3℃
- pH
- 7
- Osmotic pressure
- 低張性
Analysis Document
- Analysis date
- 2021-07-30
- Analyst organization
- 公益財団法人宮城県公衆衛生検査センター
- Registration No.
- 宮城県第1号
Cations
- Lithium ion Li⁺
- 0.20 mg/kg
- Sodium ion Na⁺
- 296 mg/kg
- Potassium ion K⁺
- 19.3 mg/kg
- Ammonium ion NH₄⁺
- < 0.1 mg/kg
- Magnesium ion Mg²⁺
- 6.3 mg/kg
- Calcium ion Ca²⁺
- 34.7 mg/kg
- Aluminum ion Al³⁺
- < 0.1 mg/kg
- Manganese ion Mn²⁺
- < 0.1 mg/kg
- Iron(II) ion Fe²⁺
- 0.10 mg/kg
- Iron(III) ion Fe³⁺
- < 0.1 mg/kg
- Zinc ion Zn²⁺
- < 0.1 mg/kg
- Lead ion Pb²⁺
- < 0.01 mg/kg
- Strontium ion Sr²⁺
- 0.50 mg/kg
- Copper ion Cu²⁺
- < 0.1 mg/kg
- Cadmium ion Cd²⁺
- < 0.002 mg/kg
- Total cations
- 0.36 mg/kg
Anions
- Fluoride ion F⁻
- 2.8 mg/kg
- Chloride ion Cl⁻
- 197 mg/kg
- Hydroxide ion OH⁻
- 0.00 mg/kg
- Hydrogen sulfide ion HS⁻
- < 0.1 mg/kg
- Thiosulfate ion S₂O₃²⁻
- < 0.1 mg/kg
- Sulfate ion SO₄²⁻
- 225 mg/kg
- Bicarbonate ion HCO₃⁻
- 320 mg/kg
- Carbonate ion CO₃²⁻
- 0.00 mg/kg
- Bromide ion Br⁻
- 0.50 mg/kg
- Iodide ion I⁻
- < 0.1 mg/kg
- Hydrogen sulfate HSO₄⁻
- 0.00 mg/kg
- Dihydrogen phosphate H₂PO₄⁻
- 0.00 mg/kg
- Hydrogen phosphate HPO₄²⁻
- 0.20 mg/kg
- Arsenite ion AsO₂⁻
- 0.00 mg/kg
- Sulfide ion S²⁻
- 0.00 mg/kg
- Hydrogen metasilicate HSiO₃⁻
- 0.00 mg/kg
- Metaborate ion BO₂⁻
- 0.00 mg/kg
- Total anions
- 0.75 mg/kg
Undissociated Components
- Arsenious acid HAsO₂
- 0.80 mg/kg
- Metasilicic acid H₂SiO₃
- 117 mg/kg
- Metaboric acid HBO₂
- 19.0 mg/kg
- Total undissociated
- 0.14 mg/kg
Dissolved Gas
- Free carbon dioxide CO₂
- 173 mg/kg
- Free hydrogen sulfide H₂S
- < 0.1 mg/kg
- Total dissolved gas
- 0.17 mg/kg
Totals
- Total dissolved substances
- 1.2 mg/kg
- Component total
- 1.4 mg/kg
- Evaporation residue
- 1.0 mg/kg
Usage
- Usage status
- Unknown
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