Supplementary Information
Table 1 pHc and Eh (mV) of SR-270-PW and Na-Ca-Cl (I = 4.6 M) brine solutions in the solid/liquid
ratio dependence experiments
SR-270-PW
Solid/Liquid ratio (S/L)
S/L = 0.10 g/5.0 mL
S/L = 0.20 g/5.0 mL
S/L =0.30 g/5.0 mL
S/L = 0.40 g/5.0 mL
S/L = 0.50 g/5.0 mL
Illite
Shale
MX-80
pHc
pHc
pHc
Eh
Eh
Eh
7.7
7.4
7.9
351 mV
349 mV
349 mV
7.6
7.7
8.0
348 mV
359 mV
356 mv
7.7
7.4
8.0
347 mV
356 mV
353 mV
7.7
7.4
8.0
335 mV
352 mV
359 mV
7.6
7.4
8.1
349 mV
353 mV
354 mV
Illite
Shale
MX-80
Na-Ca-Cl (I = 4.6 M)
Solid/Liquid ratio (S/L)
S/L = 0.10 g/5.0 mL
S/L = 0.20 g/5.0 mL
S/L = 0.30 g/5.0 mL
S/L = 0.40 g/5.0 mL
S/L = 0.50 g/5.0 mL
pHc
pHc
pHc
Eh
Eh
Eh
7.7
8.0
9.0
359 mV
361 mV
306 mV
7.7
8.1
9.1
348 mV
362 mV
305 mV
7.7
7.9
8.9
349 mV
360 mV
308 mV
7.7
7.8
9.0
348 mV
358 mV
310 mV
7.8
8.0
9.1
343 mV
362 mV
311 mV
Table 2 pHc and Eh (mV) of Na-Ca-Cl solutions in pHc dependence experiments
Illite
Shale
MX-80
pHc 6.2
pHc 7.2
pHc 8.2
pHc 9.2
pHc 9.7
Eh 448 mV
Eh 383 mV
Eh 356 mV
Eh 311 mV
Eh 289 mV
pHc 6.3
pHc 7.3
pHc 8.3
pHc 9.3
pHc 9.7
Eh 447 mV
Eh 381 mV
Eh 356 mV
Eh 311 mV
Eh 290 mV
pHc 6.2
pHc 7.2
pHc 8.3
pHc 9.3
pHc 9.7
Eh 443 mV
Eh 381 mV
Eh 356 mV
Eh 309 mV
Eh 289 mV
Table 3 pHc and Eh (mV) of Na-Ca-Cl solutions in the ionic strength dependence experiments
Ionic Strength (M)
0.10
0.50
1.0
2.0
3.0
4.0
4.6
Illite
pHc
7.8
7.2
7.1
7.3
7.2
7.4
7.7
Eh (mV)
341
346
347
348
350
348
349
pHc
8.1
7.8
7.6
7.6
7.7
7.8
7.9
Eh (mV)
358
362
363
362
364
361
364
pHc
9.1
8.8
8.5
8.6
8.6
8.9
9.0
Eh (mV)
306
311
320
321
325
312
310
Shale
MX-80
Table 4 pHc and Eh (mV) of CaCl2, Ca-Na-Cl, Na-Ca-Cl, and NaCl solutions in the Na/Ca
ratio dependence experiments
CaCl2
Solution
Ca-Na-Cl/Na-Ca-Cl solution
NaCl solution
solution
Na/Ca ratio
0
0.1
1
5
10
∞
Illite
8.6
8.5
7.9
7.3
6.9
8.0
Eh (mV) 339
335
354
384
393
351
pHc
9.2
9.0
8.3
7.7
7.4
8.6
Eh (mV)
313
315
343
361
359
326
pHc
10.2
10.0
9.4
8.7
8.5
8.7
Eh (mV)
233
234
302
322
320
314
Shale
MX-80
pHc
Table 5 pHc and Eh (mV) of SR-270-PW and Na-Ca-Cl (I = 4.6 M) brine solutions in
isotherm experiments
SR-270-PW
1 x 10−8
1 x 10−7
1 x 10−6
1 x 10−4
7.6
7.7
7.6
7.6
348
348
348
349
7.5
7.5
7.5
7.4
353
352
353
353
8.0
8.0
8.0
8.0
355
354
355
356
1 x 10−8
1 x 10−7
1 x 10−6
1 x 10−4
7.6
7.6
7.8
7.6
348
350
348
348
8.0
7.9
7.9
8.0
364
364
363
362
9.0
9.0
9.1
9.0
310
309
309
309
Initial Concentration (M)
Illite
pHc
Eh (mV)
Shale
pHc
Eh (mV)
MX-80
pHc
Eh (mV)
Na-Ca-Cl solution
Initial Concentration (M)
Illite
pHc
Eh (mV)
Shale
pHc
Eh (mV)
MX-80
pHc
Eh (mV)