Table 2: Average pH recorded for leather dust detoxification samples between 0-216 h.
Sample |
NB |
NBBS |
NBCR |
NBLD |
NBBSCR |
NBBSLD |
NBBSCRLD |
Time(h) |
pH Average ± Standard Deviation |
0 |
7.25±0.01 |
7.25±0.02 |
6.96±0.03 |
7.12±0.02 |
7.05±0.02 |
7.09±0.02 |
7.02±0.03 |
24 |
7.45±0.07 |
8.29±0.04 |
7.18±0.01 |
6.48±0.13 |
7.64±0.71 |
7.97±0.02 |
8.31±0.03 |
48 |
7.30±0.15 |
8.68±0.04 |
7.16±0.01 |
6.40±0.13 |
7.69±0.90 |
8.40±0.02 |
8.61±0.04 |
120 |
7.39±0.03 |
9.00±0.08 |
7.15±0.03 |
6.14±0.15 |
7.73±1.11 |
8.94±0.03 |
9.02±0.01 |
144 |
7.23±0.01 |
8.88±0.07 |
7.07±0.01 |
6.09±0.13 |
7.70±1.09 |
8.91±0.04 |
9.02±0.03 |
168 |
7.60±0.54 |
8.95±0.06 |
7.13±0.02 |
6.11±0.23 |
7.69±1.06 |
8.91±0.06 |
8.97±0.03 |
192 |
7.71±0.70 |
8.90±0.06 |
7.14±0.01 |
6.06±0.17 |
7.72±1.09 |
8.82±0.03 |
8.94±0.03 |
216 |
8.07±0.65 |
8.79±0.06 |
7.67±0.91 |
6.14±0.21 |
7.69±1.01 |
8.75±0.03 |
8.87±0.03 |