Table 1.

Names, classification and maximum absorbance (in the citrate buffer 0.1 M, pH = 4.5) of six dyes used

Name	Classification	Dye concentration (mg/L)	λmax
Panseu-S	Diazo	240	513
Methylene blue	Heterocyclic	100	610
Congo red	Diazo	360	514
Bromophenol blue	Triphenylmethane	120	592
Commassie brilliant blue	Triphenylmethane	120	583
Remazol Brilliant Blue R (RBBR)	Anthraquinone	600	592

^a[25].