Table 3 Leaching tests conducted with ISG glass

From: Contribution of zeolite-seeded experiments to the understanding of resumption of glass alteration

Test referencea

T (°C)

S/V (m-1)

pHT b

pOH

[Na+]0 (mM)

Notes

US-1770-11.3

90

1 770

11.3

0.8

250

 

US-1770-11.0

90

1 770

11.0

1.1

79

 

US-1770-10.7

90

1 770

10.7

1.4

25

 

US-1770-10.4

90

1 770

10.4

1.7

10.3

 

US-1770-10.1

90

1 770

10.1

2.0

5.0

 

US-1770-F

90

1 770

freec

 

0

 

US-70-11.3

90

70

11.3

0.8

250

[Si]0 = 92 mMd

US-70-11.0

90

70

11.0

1.1

79

[Si]0 = 23 mMd

US-70-10.7

90

70

10.7

1.4

25

[Si]0 = 10 mMd

us-1770-13.1

30

1 770

13.1

0.8

250

pH30  °C 13.1 ~ pH90  °C 11.3

us-1770-12.7

30

1 770

12.7

1.1

79

pH30  °C 12.7 ~ pH90  °C 11.0

us-1770-12.3

30

1 770

12.3

1.4

25

pH30  °C 12.3 ~ pH90  °C 10.7

S-1770-11.3

90

1 770

11.3

0.8

250

S z/S = 0.07e

S-1770-11.0

90

1 770

11.0

1.1

79

S z/S = 0.07e

S-1770-10.7

90

1 770

10.7

1.4

25

S z/S = 0.07 to 1.1e,f

S-1770-10.4

90

1 770

10.4

1.7

10.3

S z/S = 0.07e

S-1770-10.1

90

1 770

10.1

2.0

5.0

S z/S = 0.07e

S-1770-F

90

1 770

freec

 

0

S z/S = 0.07 and 1.1e,f

S-70-11.3

90

70

11.3

0.8

250

[Si]0 = 92 mMd. S z/S = 1.5e

S-70-11.0

90

70

11.0

1.1

79

[Si]0 = 23 mMd. S z/S = 1.5e

S-70-10.7

90

70

10.7

1.4

25

[Si]0 = 10 mMd. S z/S = 1.5e

s-1770-13.1

30

1 770

13.1

0.8

250

S z/S = 0.07e. pH30  °C 13.1 ~ pH90  °C 11.3

s-1770-12.7

30

1 770

12.7

1.1

79

S z/S = 0.07e. pH30  °C 12.7 ~ pH90  °C 11.0

s-1770-12.3

30

1 770

12.3

1.4

25

S z/S = 0.07e. pH30  °C 12.3 ~ pH90  °C 10.7

  1. a Test references are given according to the following formalism: name-S/V(m−1)-pH. Possible names are “US” for “unseeded test” and “S” for “seeded test”. Uppercase letters are used for leaching tests at 90 °C and lowercase for those at 30 °C
  2. b pH is given at the test temperature (90 or 30 °C)
  3. c “Free pH” tests are conducted in initially pure water, and the pH is allowed to drift freely
  4. d With an S/V ratio of 70 m−1, reaching the rate drop would require a greater amount of silicon than that contained in the glass. That is why an initial amount of silicon [Si]0 is added to the solution
  5. e The S z/S parameter quantifies the seeding level as the ratio between the surface area of zeolite seeds initially added to the test and that of glass powder
  6. f Seeded tests with several amounts of seeds
  7. The table indicates successively the test reference, the temperature at which the test is conducted, its S/V ratio, the pH (or pOH calculated with pK w = 12.1 at 90 °C) maintained throughout the test, the initial sodium concentration in solution, and any test distinctive features
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