Table 1.
Overview of the GPS locations, general in situ and laboratorium physico-chemical determinations of brine densities, TDS, and water activity of the 10 waterbodies of the halo-volcanic Dallol complex.
| Parameter | Central green pool (1) | Left green pool (2) | Right yellow pool (3) | White chimney environment (4) | Gaet’ale Pond (5) | Black lake (6) | Yellow mini pond (7) | Red micro pond (8) | Asale karst hole (9) | Karum Lake (10) |
|---|---|---|---|---|---|---|---|---|---|---|
| GPS Latitude (North) | 14°14′10.8″ | 14°14′10.6″ | 14°14′10.8″ | 14°14′11.5″ | 14°12′48.1″ | 14°13′18.4″ | 14°13′40.4″ | 14°13′41.7″ | 14°06′57.6″ | 14°02′58.0″ |
| GPS Longitude (East) | 40°18′00.5″ | 40°18′00.2″ | 40°18′00.8″ | 40°17′59.5″ | 40°19′17.1″ | 40°17′10.6″ | 40°19′08.1″ | 40°19′06.3″ | 40°20′53.2″ | 40°22′32.2″ |
| in situ measurements | ||||||||||
| Temperature [°C] | 46.1 | 34.0 | 35.5 | >100 | 41.2 | 35.7 | 32.0 | 35.1 | 35.5 | 31.5 |
| in situ pH | −0.5 | −0.5 | −0.4 | −1.1 | 6.2 | 2.4 | 4.7 | 3.1 | 5.6 | 5.4 |
| Conductivity [mS.cm−1 at 25°C] | > max. | > max. | > max. | > max. | > max. | > max. | > max. | > max. | > max. | > max. |
| EH [mV vs. SHE] | 556 | 569 | 595 | 466 | 336 | 396 | 296 | 434 | 382 | 392 |
| Labo measurements | ||||||||||
| pH1/50 diluted [−] | 0.7 | 0.8 | 0.9 | 0.7 | 3.4 | 2.8 | 3.7 | 3.5 | 4.4 | 4.5 |
| Conductivity [mS.cm−1] | 422 | 418 | 404 | 424 | 598 | 521 | 395 | 494 | 373 | 375 |
| EH [mV vs. SHE] | 620 | 619 | 630 | 627 | 460 | 478 | 396 | 426 | 407 | 416 |
| Density [Mg.m−3] | 1.225 | 1.223 | 1.222 | 1.223 | 1.454 | 1.351 | 1.246 | 1.342 | 1.220 | 1.218 |
| TDS measured [g.l−1] | 314 | 319 | 320 | 318 | 682 | 434 | 373 | 504 | 352 | 350 |
| Water activity Aw [−] | 0.725 | 0.728 | 0.731 | 0.729 | 0.234 | 0.324 | 0.684 | 0.463 | 0.734 | 0.735 |