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Table 1 Geochemical and physical parameters of SHP hot spring water

From: Metabolic characteristics of dominant microbes and key rare species from an acidic hot spring in Taiwan revealed by metagenomics

Parametera Current study Song et al., 2005b [21]
pH 2.5 2.77 – 3.25
Temperature (°C) 69.0 49.8 – 85.1
TDS 707 177 – 1674
EC (μS/cm2) 1760 266 – 1039
ORP (mv) −62
DOC 1.0
HCO3 2− <0.03 L
NO3− L – 0.9
PO4 3− L
Cl and other halides 9.3 L (F) / 4.93 – 10.3 (Cl) / L – 3.78 (Br)
SO4 2− 378 100 – 450
S0 0.50
H2S 52.7
S2O3 2− 0.12
Fe2+ and Fe3+ 111 1.8 – 54.9 (Fe2+)
Ca2+ 1.32 5.8 – 977
Na+ 12.0 L – 13.4
Mg2+ 1.21 1.21 – 9.70
K+ 2.17 1.40 – 6.00
Al3+ 19.0 0.70 – 17.3
Total As 0.0012
  1. “L” represented concentrations below detection limits
  2. TDS total dissolved solids, EC electrical conductivity, ORP oxidation/reduction potential, DOC dissolved organic carbon
  3. aUnits were mg/L for all end points except pH
  4. bSource: Geological survey and potential application of hot springs and geothermal energy of Yangmingshan (in Chinese); monthly report of environmental parameters in the SHP acidic hot springs in 2005