TABLE 1.
Temperature, pH, chemical gas composition of the Favara Grande sampling site
| Sample site | Depth (cm) | Temp. (°C) | pH | Composition (ppm)a
|
||||||
|---|---|---|---|---|---|---|---|---|---|---|
| He | H2 | O2 | N2 | CH4 | CO2 | H2S | ||||
| FAV1 | 11 | 61.1 | 3 | 16 | 32,800 | 2,700 | 17,600 | 38,500 | 891,400 | 700 |
| 20 | 74.1 | 3.5 | 20 | 45,200 | 5,600 | 26,200 | 40,000 | 860,900 | 300 | |
| 30 | 87.4 | 4 | 28 | 69,900 | 4,800 | 22,100 | 42,100 | 844,500 | 200 | |
| 50 | 98.9 | 4 | 28 | 77,100 | 5,700 | 25,200 | 39,900 | 834,100 | 200 | |
| FAV2 | 11 | 60.2 | 4 | <5 | 125 | 192,500 | 739,400 | 1,000 | 22,000 | <50 |
| 20 | 67.3 | 4.5 | 8 | 8,400 | 107,000 | 411,100 | 18,000 | 426,700 | <50 | |
| 30 | 77.7 | 4 | 13 | 25,000 | 4,100 | 17,000 | 38,500 | 893,200 | <50 | |
| 50 | 91.7 | 4 | 21 | 48,900 | 3,300 | 13,800 | 40,300 | 874,100 | <50 | |
a
The analytical errors were less than ±10% for He and less than ±5% for the remaining gases.