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

Table 4

Summary of optical characteristics and statistics for the proposed method.

Parameters	Complex of TCNQ with
	Ethylamine	1,2-Diaminopropane	Aniline	p-Aminophenol	Benzidine
𝜆max (nm)	464	470	323	511	500
Linearity range (μg/mL)	0.025–1.25	0.25–3.0	0.5–2.5	0.05–2.5	0.05–1.25
Limit of detection (ng/mL)	6.62	22.00	14.44	13.47	11.88
Slope	0.4051	0.1213	0.1857	0.1990	0.2256
Intercept	0.0078	−0.0363	−0.0371	0.0888	0.0227
Correlation coefficients	0.9988	0.9986	0.9993	0.9961	0.9922
Molar absorptivity (L·mol^−1·cm^−1×10^4)	1.8231	8.977	1.7273	2.1699	5.8034