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

Table 9

Comparison of current method with other reported methods using 𝜋-acceptors.

π-Acceptors	Amine	𝜆max (nm)	Temp. (°C)	Developing time (min)	Linearity range (μg·ml^−1)	Molar absorptivity (L·mol^−1·cm^−1)	Ref.
DDQ*	Aniline	345	50	30	0.1–4.0	1.36×10^3	[8]
	p-Aminophenol	355	40	40	0.2–6.4	3.36×10^3
p-Chloranil	Aniline	355	55	30	0.2–3.2	1.16×10^4	[7]
	p-Aminophenol	345	20	60	2–32	3.80×10^3
TCNE**	Ethylamine	325	40	20	0.2–7.2	2.83×10^3	[19]
	Aniline	344	40	20	0.2–7.2	1.23×10^4
	p-Aminophenol	350	20	5	1–24	4.57×10^3
TCNQ	Aniline	323	RT	Immediately	0.5–2.5	1.72×10^4	Present method
	p-Amino phenol	511	40	5	0.05–2.5	2.16×10^4
	Benzidine	500	RT	Immediately	0.05–1.25	5.80×10^4
	Ethylamine	464	40	20	0.025–1.25	1.82×10^4
	1,2-Diaminopropane	470	50	30	0.25–3.0	8.97×10^4

∗2,3-Dichloro-5,6-dicyano-1,4-benzoquinone.
∗∗Tetracyanoethylene.