Skip to main content

Advertisement

Table 6 Lead speciation, as a function of pH and log along the 0.001 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 -52.70 Hm 0.06 23.60 2.3 × 10-4 73.47 0.80 2.6 × 10-3 7
6.00 -52.40 Py 0.22 93.09 0.57 2.89 3.04 0.01 6
6.00 -53.55 Py 1.1 × 10-3 0.48 99.49 0.02 0.02 5.2 × 10-5 5
6.45 -54.00 Py 1.6 × 10-4 0.07 99.92 5.8 × 10-3 2.3 × 10-3 7.5 × 10-6 4
7.00 -54.60 Py 1.3 × 10-5 5.4 × 10-3 99.99 1.7 × 10-3 1.9 × 10-4 6.1 × 10-7 3
7.30 -55.00 Py 3.2 × 10-6 1.3 × 10-3 99.99 8.3 × 10-4 4.7 × 10-5 1.5 × 10-7 2
7.55 -57.00 Py 9.4 × 10-7 3.9 × 10-4 99.99 4.3 × 10-4 1.3 × 10-5 4.3 × 10-8 1
  1. aSpeciation for the indicated complexes is given as mol% of total Pb. bThe 0.001 ppm isopleth is illustrated in Fig. 3. cSaturation with respect to hematite (Hm), pyrite (Py), or magnetite (Mt).