Table 3 Characteristics of sandstone hydrochemical changes under long-term immersion.

From: Dynamic behavior and micro–meso scale fracture mechanisms of sandstone under long-term water immersion

Immersion time (d)

pH

Total dissolved solids(mg/L)

Ion concentration(mg/L)

Mg2+

K+

Ca2+

SiO2

0

7.01

5.2

0.11

0.12

0.21

0

3

8.21

24.7

0.95

0.84

4.65

0.58

30

7.82

61.3

1.45

2.95

8.12

2.65

90

7.23

98.4

1.56

2.54

9.13

3.37

180

6.83

109.5

1.69

2.53

11.45

3.45

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