Physical and chemical properties of Estonian balneological peat
Key Findings
- 7 Estonian peatlands identified with high-quality balneological peat, total reserves 920,000 tons
- Humic substance content up to 60% in Estonian peat — humic, hymatomelanic, and fulvic acids all present
- Balneologically suitable peat found at 0.85–1.50 m depth, moisture 85–92%, pH 3.3–5.1
- Trace element content (34 elements analyzed) below hazardous levels — Estonian peat is ecologically clean
- Well-humified (40–50%, von Post 6–8) raised bog peat is most suitable for balneological use
Study characterizing the physical and chemical properties of peat from 7 Estonian peatlands for balneological use. Samples taken from middle layers (minimal environmental influence) and analyzed for humic substance content and 34 trace elements.
Key Data
- Peatlands studied: Härada, Kõverdama, Larvi, Oese, Parika, Sangla, Helme
- Total reserves: 920,000 tons of balneological-quality peat
- Suitable depth: 0.85–1.50 m (below 0.7 m is economically impractical)
- Peat type: Primarily cottongrass-sphagnum, cottongrass, wood-cottongrass, heath-cottongrass
- Humification: 40–50% (von Post scale 6–8)
- pH range: 3.3–5.1 across sites
- Moisture: 85–92% (above minimum 85% requirement)
- Ash content: 1.8–4.9%
Humic Substance Content
Highest concentrations in Kõverdama, Parika, Härada, and Larvi peatlands. Humic acid, hymatomelanic acid, and fulvic acid all present in all sampled layers. Humic acid content measured at 20–40% of dry mass in most samples, with total humic substance content reaching up to 60%.
Trace Elements
34 elements analyzed via ICP-MS and ICP-AES in the laboratory of Geological Survey of Finland. All trace element concentrations below levels hazardous to human health. Heavy metal content lower than Estonian averages. Confirms ecological cleanliness of Estonian raised bog peat for cosmetic/therapeutic use.
Relevance
Directly relevant to Sphagnum Botanicals’ sourcing — confirms Estonian peat as high-quality balneological material with high bioactive content and low contamination risk. Also introduces hymatomelanic acids as an additional bioactive fraction not yet in the knowledge graph.