Table 2: Measured data (absorbance values) for blind (1-3 [italic]), average of blind (4 [bold italic]), and proper (5-9) samples in function of methylene blue volume (0.05, 0.10, and 0.15 cm3) for six modifiers.

NameNo.Methylene blue [cm3]NameNo.Methylene blue [cm3]
0.050.100.150.050.100.15

2,2’-((4-chlorophenyl)-imino)diethanol10.44330.76491.17491,1’-((4-chlorophenyl)-imino)dipropan-2-ol10.41420.82351.1204
20.44550.76341.174720.41430.82421.1224
30.44550.76671.172930.41340.82241.1208
40.44480.76501.174240.41400.82341.1212
50.43200.76511.136350.41110.78601.0789
60.42750.75991.116060.40490.77661.0696
70.42100.75041.099970.39680.76881.0517
80.41170.74451.085280.38700.75501.0282
90.40280.72871.061490.37780.73791.0089

2,2’-((4-bromophenyl)-imino)diethanol10.38900.81440.96401,1’-((4-bromophenyl)-imino)dipropan-2-ol10.49780.75771.1641
20.39080.81560.964720.49820.75861.1678
30.39130.81860.962230.49860.76031.1705
40.39040.81620.963640.49820.75891.1675
50.41920.78610.945450.45070.74851.1500
60.41920.78080.942060.44910.74391.1441
70.41410.77500.929170.44590.73751.1393
80.40650.76480.917880.44100.72851.1260
90.39900.75490.905490.43540.72051.1199

2,2’-((4-iodophenyl)imino)-diethanol10.38710.66180.94311,1’-((4-iodophenyl)imino)-dipropan-2-ol10.39220.72171.1020
20.39050.66180.945020.39030.72201.1002
30.39250.66430.947730.38900.72061.1018
40.39000.66270.945240.39050.72141.1013
50.39590.64270.915750.36030.71051.0240
60.39130.63540.908560.35850.70051.0124
70.38390.62620.898070.35330.68781.0032
80.37610.61620.885480.34640.67100.9815
90.36620.60030.872090.33810.65310.9656