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Table 8 Zinc speciation, as a function of pH and log along the 0.01 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 -52.55 Hm 0.11 31.53 9.3 × 10-6 67.90 0.45 9.0 × 10-3 7
7.00 -52.35 Hm 0.28 81.15 3.8 × 10-4 17.30 1.22 0.02 6
6.00 -52.30 Py 0.34 96.19 0.03 2.07 1.33 0.03 5
4.75 -52.90 Py 0.04 12.36 87.48 0.02 0.10 2.5 × 10-3 4
5.78 -54.00 Py 3.9 × 10-4 0.11 99.89 1.4 × 10-3 1.5 × 10-3 3.0 × 10-5 3
6.40 -55.00 Py 2.4 × 10-5 6.7 × 10-3 99.99 3.6 × 10-4 9.6 × 10-5 1.9 × 10-6 2
6.50 -56.00 Py 1.7 × 10-5 4.8 × 10-3 99.99 3.2 × 10-4 6.9 × 10-5 1.4 × 10-6 1
  1. aSpeciation for the indicated complexes is given as mol% of total Zn. bThe 0.01 ppm isopleth is illustrated in Fig. 3. cSaturation with respect to hematite (Hm), pyrite (Py), or magnetite (Mt).