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Table 7 Zinc speciation, as a function of pH and log along the 100 ppm Zn isopleth of the model composite ore-brine at 100°Cab

From: Transport of Pb and Zn by carboxylate complexes in basinal ore fluids and related petroleum-field brines at 100 °C: the influence of pH and oxygen fugacity

pH log Iron phasecsaturation Cation Chloride complexes Sulfide complexes Hydroxide complexes Acetate complexes Malonate complexes Data set
8.00 -50.55 Hm 0.11 31.53 9.2 × 10-14 67.90 0.45 9.0 × 10-3 5
7.00 -50.35 Hm 0.28 81.15 3.8 × 10-12 17.30 1.22 0.02 4
5.00 -50.3 Hm 0.35 98.43 2.9 × 10-8 0.21 0.97 0.23 3
4.00 -50.3 Py 0.36 99.36 2.9 × 10-6 0.02 0.24 9.6 × 10-3 2
3.00 -50.3 Py 0.36 99.60 2.7 × 10-4 2.2 × 10-3 0.03 2.0 × 10-3 1
  1. aSpeciation for the indicated complexes is given as mol% of total Zn. bThe 100 ppm isopleth is illustrated in Fig. 3. cSaturation with respect to hematite (Hm), pyrite (Py), or magnetite (Mt).