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