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Table 9 Zinc speciation, as a function of pH and log along the 0.001 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 -53.05 Mt 0.11 31.53 9.3 × 10-4 67.90 0.45 9.0 × 103 8
7.00 -52.85 Mt 0.28 81.11 0.04 17.30 1.22 0.02 7
6.00 -52.80 Py 0.33 93.57 2.75 2.01 1.29 0.03 6
6.00 -53.55 Py 0.01 3.73 96.12 0.08 0.05 1.0 × 10-3 5
6.40 -54.00 Py 1.5 × 10-3 0.43 99.54 0.02 6.2 × 10-3 1.3 × 10-4 4
7.00 -54.60 Py 1.3 × 10-4 0.04 99.95 7.9 × 10-3 5.5 × 10-4 1.1 × 10-5 3
7.30 -55.00 Py 2.8 × 10-5 8.0 × 103 99.99 3.4 × 103 1.2 × 10-4 2.3 × 10-6 2
7.70 -56.00 Py 6.8 × 10-6 1.9 × 103 99.99 2.1 × 103 2.8 × 10-5 5.5 × 10-7 1
  1. aSpeciation for the indicated complexes is given as mol% of total Zn. bThe 0.001 ppm isopleth is illustrated in Fig. 3. cSaturation with respect to hematite (H), pyrite (Py), or magnetite (Mt).