271-6 core pH

Penetration rate/×10−3 μm2

I_b

Alkali sensitivity

406-5 core pH

Penetration rate/×10−3 μm2

I_b

Alkali sensitivity

417-9 core pH

Penetration rate/×10−3 μm2

I_b

Alkali sensitivity

7

822.63

13.23%

Weak

7

734.52

31.57%

Moderately weak

7

957.22

17.12%

Weak

8

828.86

8

722.06

8

927.31

9

877.88

9

714.66

9

903.14

10

631.34

10

687.41

10

827.19

11

720.59

11

660.22

11

813.06

12

321.89

12

357.05

12

417.91

13

161.68

13

176.22

13

239.38