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Table I Starting and final compositions for the evaporation of a synthetic "sulfate type" Topopah Spring Tuff pore water.

From: Evaporative evolution of a Na–Cl–NO3–K–Ca–SO4–Mg–Si brine at 95 °C: Experiments and modeling relevant to Yucca Mountain, Nevada

 

Leg l FEC 9 molala starting

Leg l FEC 9 molal, 95°C starting

Leg l FEC 9 molal, 95°C final

Leg 2 FEC 12 molal, 95°C starting

Leg 2 FEC 12 molal, 95°C final

Leg 3b FEC 13 molal, 95°C starting

Leg 3 FEC 13 molal, 95°C final

Leg 4b FEC 14 molal, 95°C starting

Leg 4 FEC 14 molal, 95°C final

PHa

9.65

nac

7.15

7.60

7.32

7.69

nac

8.08

6.97

F

5.94 × 10-5

ndd

ndd

ndd

ndd

ndd

ndd

ndd

ndd

Ca

1.57 × 10-3

1.25 × 10-3

4.36 × 10-3

4.69 × 10-3

2.25 × 10-2

2.17 × 10-2

4.21 × 10-2

4.06 × 10-2

1.03 × 10-2

Mg

1.01 × 10-3

6.48 × 10-4

5.58 × 10-4

6.05 × 10-4

4.52 × 10-3

1.06 × 10-3

6.43 × 10-3

1.88 × 10-3

9.02 × 10-3

Na

2.84 × 10-3

3.04 × 10-3

9.23 × 10-3

1.10 × 10-2

1.05 × 10-1

1.11 × 10-1

1.15

1.12

7.42

SiO2

1.39 × 10-3

9.21 × 10-4

1.15 × 10-3

1.38 × 10-3

7.91 × 10-3

2.24 × 10-3

6.32 × 10-3

3.09 × 10-4

1.89 × 10-5

K

1.76 × 10-4

1.63 × 10-4

5.15 × 10-4

5.82 × 10-4

5.66 × 10-3

6.54 × 10-3

6.99 × 10-2

7.89 × 10-2

8.09 × 10-1

Cl

3.26 × 10-3

3.31 × 10-3

1.00 × 10-2

9.80 × 10-3

9.80 × 10-2

1.05 × 10-1

9.93 × 10-1

1.09

6.59

NO3

3.53 × 10-4

3.94 × 10-4

1.15 × 10-3

1.32 × 10-3

1.12 × 10-2

1.18 × 10-2

1.29 × 10-1

1.32 × 10-1

1.42

SO4

1.23 × 10-3

1.85 × 10-3

4.54 × 10-3

4.64 × 10-3

2.35 × 10-2

2.24 × 10-2

5.85 × 10-2

5.80 × 10-2

1.36 × 10-1

HCO3

7.93 × 10-4

3.11 × 10-4

ndd

1.59 × 10-4

ndd

1.92 × 10-4

ndd

1.95 × 10-4

2.66 × 10-4

  1. aMeasured at room temperature.
  2. bMagnesium and silica precipitated from the solution at 25°C. Initial gravimetric concentrations are Mg = 4.5 × 10-3 mol/kg-solution and Si = 7.8 × 10-3 mol/kg-solution for Leg3 and are Mg = 6.0 × 10-3 mol/kg-solution and Si = 5.9 × 10-3 mol/kg-solution for Leg4.
  3. cNot analyzed.
  4. dNot detected, detection limits: F = 0.25 ppm, HCO3 = 1 ppm.