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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).