The Use of 7,7′,8,8′-Tetracyanoquinodimethane for the Spectrophotometric Determination of Some Primary Amines Application to Real Water Samples

Table 2

Effect of surfactants on the absorption of aromatic amine-TCNQ complexes.

Surfactant (0.1%)	Absorbance of TCNQ complex with
	Aniline (2.5 μg/mL) at		p-Aminophenol (1.5 μg/mL) at		Benzidine (1 μg/mL) at
	313 nm	323 nm	475 nm	511 nm	480 nm	500 nm
CPC	0.230	0.313	0.242	0.400	0.236	0.246
CTAB	0.172	—	0.228	—	0.254	0.268