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Effect of Some Deacidification Agents on Copper-Catalyzed Degradation of Paper

Table 3

Table 3. Effect of Deacidification Treatments on pH Values of Samples Aged at 90° C and 50% RH

Days Aged

Control water
washed
treatment

Copper
sorption only
treatment

Copper and
calcium 2-step
treatment

Copper and
Mg(HCO3)2
immersion treatment

Copper and
Mg(HCO3)2
spray treatment

Copper and
Zn(HCO3)2
spray treatment

0

6.10

5.88

8.78

9.40

10.25

7.20

2

----

5.18

8.70

9.48

10.05

7.10

5

5.85

4.80

8.71

9.40

10.20

6.80

8

5.59

4.47

8.60

9.62

10.20

6.65

12

5.52

4.40

----

9.28

----

----

13

----

----

8.18

----

9.78

6.00

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