|
|
Table 3. Mean equilibrium
pH (pHfin) at various initial metal ion concentrations (Co,
mg/L). Values are average of triplicate measurement as indicated
in the procedure. |
|
Initial pH |
Final pH (pHfin) |
|||||||||
|
Pb2+ |
Cd2+ |
|||||||||
| 2mg/L |
4mg/L |
6mg/L |
8mg/L |
10mg/L |
2mg/L |
4mg/L |
6mg/L |
8mg/L |
10mg/L |
|
| 2 |
1.98 |
1.93 |
1.94 |
1.85 |
1.83 |
1.94 |
1.90 |
1.90 |
1.87 |
1.88 |
| 3 |
2.78 |
2.77 |
2.75 |
2.75 |
2.76 |
2.63 |
2.42 |
2.41 |
2.38 |
2.38 |
| 4 |
3.65 |
3.50 |
3.48 |
3.45 |
3.33 |
3.52 |
3.44 |
3.37 |
3.30 |
3.24 |
| 5 |
3.53 |
3.48 |
3.45 |
3.40 |
3.28 |
3.75 |
3.59 |
3.48 |
3.36 |
3.29 |
| 6 |
4.69 |
4.54 |
4.54 |
4.53 |
4.51 |
4.91 |
4.88 |
4.80 |
4.78 |
4.79 |
| 7 |
5.96 |
5.91 |
5.91 |
5.78 |
5.66 |
5.91 |
5.78 |
5.76 |
5.65 |
5.52 |
| 8 |
6.36 |
6.87 |
6.75 |
6.73 |
6.59 |
6.94 |
6.88 |
6.81 |
6.79 |
6.83 |
|
|