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Table 4 Lead speciation, as a function of pH and log along the 100 ppm Pb 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 -50.20 Hm 0.06 23.60 2.3 × 10-14 74.47 0.80 2.6 × 10-3 5
7.00 -49.95 Hm 0.17 72.64 6.9 × 10-13 22.38 2.59 8.3 × 10-3 4
5.00 -49.90 Hm 0.23 97.25 5.9 × 10-9 0.30 2.19 9.9 × 10-3 3
4.00 -49.90 Py 0.24 99.21 6.0 × 10-7 0.03 0.51 8.9 × 10-3 2
3.00 -49.90 Py 0.24 99.69 6.0 × 10-5 3.2 × 103 0.05 6.3 × 10-3 1
  1. aSpeciation for the indicated complexes is given as mol% of total Pb. bThe 100 ppm isopleth is illustrated in Fig. 2. cSaturated with respect to hematite (Hm), pyrite (Py), or magnetite (Mt).