Sample (location) Methylene blue Added, ppm Bentonite Acid activated bentonite
R,% RSD, % R,% RSD,%
Bidistilled water (Our lab) 5
10
15
99.30
98.70
98.20
0.201
0.041
0.041
70.00
70.50
73.10
0.078
0.114
0.100
Tab water (domestic supply) 5
10
15
99.13
98.55
98.00
0.211
0.050
0.039
72.50
74.30
76.00
0.076
0.210
0.099
Waste water (Sewage drainage station) 5
10
15
99.00
98.50
98.00
0.211
0.056
0.042
71.79
71.32
78.87
0.065
0.100
0.110
Underground water (Salaka Village) 5
10
15
98.70
98.43
97.77
0.211
0.321
0.097
75.60
71.10
78.80
0.086
0.202
0.223
Table 7: Recovery of methylene blue from different water samples using bentonite and acid activated bentonite (n=5).
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