K2Cr2O7 Content (%) | initial concentration – paste (g·L−1) | final concentration - extract (g·L−1) | efficiency (%) | ||
7 days | 28 days | 7 days | 28 days | ||
0.50 | 4.42 | 1.98E−03 | 2.31E−03 | 99.96 | 99.95 |
1.00 | 8.84 | 3.59E−03 | 5.74E−03 | 99.96 | 99.94 |
1.50 | 13.26 | 8.02E−03 | 9.03E−03 | 99.94 | 99.93 |
2.00 | 17.67 | 1.34E−02 | 1.44E−02 | 99.92 | 99.92 |
2.50 | 22.09 | 2.18E−02 | 2.03E−02 | 99.90 | 99.91 |