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Table 5 Lead speciation, as a function of pH and log along the 0.01 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 -52.20 Hm 5.6 × 10-2 23.6 2.3 × 10-6 73.47 0.80 2.6 × 10-3 8
7.00 -51.95 Hm 0.17 72.64 7.6 × 10-5 22.37 2.58 8.3 × 10-3 7
5.00 -51.90 Py 0.23 96.68 0.59 0.30 2.18 0.01 6
4.00 -51.90 Py 0.17 71.75 27.67 0.02 0.37 6.4 × 10-3 5
4.20 -52.00 Py 0.17 68.42 30.85 0.03 0.52 6.3 × 10-3 4
4.75 -52.90 Py 4.1 × 10-3 1.70 98.26 3.0 × 10-3 0.03 1.7 × 10-4 3
5.80 -54.00 Py 3.5 × 10-5 0.02 99.98 2.9 × 10-4 4.6 × 10-6 1.6 × 106 2
6.30 -55.00 Py 3.2 × 10-6 1.4 × 10-3 99.99 8.4 × 10-5 4.6 × 10-5 1.5 × 10-7 1
  1. aSpeciation for the indicated complexes is given as mol% of total Pb. bThe 0.01 ppm isopleth is illustrated in Fig. 2. cSaturated with respect to hematite (Hm), pyrite (Py), or magnetite (Mt).