Research Article
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
-acceptors.
| π-Acceptors | Amine | (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 | |
[8] | p-Aminophenol | 355 | 40 | 40 | 0.2–6.4 | |
| p-Chloranil | Aniline | 355 | 55 | 30 | 0.2–3.2 | |
[7]
| p-Aminophenol | 345 | 20 | 60 | 2–32 | |
| TCNE** | Ethylamine | 325 | 40 | 20 | 0.2–7.2 | |
[19] | Aniline | 344 | 40 | 20 | 0.2–7.2 | | p-Aminophenol | 350 | 20 | 5 | 1–24 | |
| TCNQ | Aniline | 323 | RT | Immediately | 0.5–2.5 | | Present method | p-Amino phenol | 511 | 40 | 5 | 0.05–2.5 | | Benzidine | 500 | RT | Immediately | 0.05–1.25 | | Ethylamine | 464 | 40 | 20 | 0.025–1.25 | | 1,2-Diaminopropane | 470 | 50 | 30 | 0.25–3.0 | |
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2,3-Dichloro-5,6-dicyano-1,4-benzoquinone. Tetracyanoethylene.
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