Table 1 Physicochemical parameters of surface water from Laguna Pozo Bravo
From: Seasonal biogeochemical variations in a modern microbialite reef under early Earth-like conditions
Physicochemical parameter | Unit | Winter value | Summer value |
|---|---|---|---|
pH | 7.84 | 8 | |
Surface conductivity | mS cm–1 | 150.4 | 175.2 |
Surface temperature | °C | 9 | 23 |
Dissolved oxygen (DO) | % air saturation | 171 | 27.5 |
Water column height of the shoreline | cm | 26 | 7 |
Biochemical oxygen demand (BOD5) | mg L–1 | 161 | 230 |
Chemical oxygen demand (COD) | mg L–1 | 475 | 705 |
Total hardness | mg CaCO3 L–1 | 8460 | 10,250 |
Chlorine | mg L–1 | 78,200 | 100,620 |
Sodium | mg L–1 | 45,100 | 57,500 |
Potassium | mg L–1 | 990 | 1140 |
Phosphate | mg L–1 | <3.00 | <3.00 |
Nitrate | mg L–1 | <5.00 | <5.00 |
Nitrite | mg L–1 | <0.02 | <0.02 |
Sulphate | mg L–1 | 1920 | 1840 |
Arsenic | mg L–1 | 0.07 | 0.86 |
Calcium | mg L–1 | 1570 | 1910 |
Lithium | mg L–1 | 21.30 | 101 |
Magnesium | mg L–1 | 1100 | 1330 |
Dissolved silica | mg L–1 | 83.20 | 158 |
Iron | mg L–1 | <0.10 | 0.33 |
Boron | mg L–1 | 10.50 | 152 |
Copper | mg L–1 | 0.24 | <0.01 |
Nickel | mg L–1 | <0.05 | <0.05 |
Manganese | mg L–1 | 0.05 | 0.60 |
Mercury | mg L–1 | <0.01 | <0.01 |
Chromium | mg L–1 | <0.01 | <0.01 |
Aluminium | mg L–1 | <0.10 | 2.97 |
Cadmium | mg L–1 | <0.01 | <0.01 |
Lead | mg L–1 | <0.01 | <0.01 |
