Effect of Some Deacidification Agents on Copper-Catalyzed Degradation of Paper
Table 4
Table 4. Effect of Chemical Treatments* on Copper Content**
Treatment |
Copper content (ppm) |
Copper lost (%) |
|---|---|---|
Calcium hydroxide, calcium bicarbonate |
609.0 |
16.0 |
Calcium hydroxide (0.23 mol/l) |
638.0 |
12.0 |
Calcium bicarbonate (0.008 mol/l) |
92.0 |
87.3 |
Magnesium bicarbonate (0.059 mol/l) |
26.2 |
96.4 |
Zinc bicarbonate (0.012 mol/l) |
53.0 |
92.7 |
Sodium bicarbonate (0.1 mol/l) |
18.0 |
97.5 |
Magnesium acetate (0.05 mol/l) |
613.0 |
15.4 |
Methyl magnesium carbonate |
670.0 |
7.6 |
*All chemical treatments were by immersion in a chemical bath for 30minutes,
followed by gentle pressing between blotters, and air-drying.
**Initial copper content of paper=725 ppm.
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