Highly sensitive spectrophotometric determination of nitrite ion using 5,10,15,20-tetrakis(4-aminophenyl)porphine for application to natural waters
✍ Scribed by T. Kawakami; S. Igarashi
- Publisher
- Elsevier Science
- Year
- 1996
- Tongue
- English
- Weight
- 457 KB
- Volume
- 333
- Category
- Article
- ISSN
- 0003-2670
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✦ Synopsis
A water-soluble porphyrin having the aminophenyl group, 5,10,15,20-tetrakis(4-aminophenyl)porphine, reacts with nitrite ion, and produces a large spectral change (k=3.0x
IO5 1 molP' cm-', 434 nm). There are few interfering substances and it is easy to establish the reaction conditions because the spectral change mechanism is based only on diazotization. A highly sensitive spectrophotometric determination of nitrite was developed on this basis. The calibration graph was linear in the range 0 to 4.0x 10P7 mol I--' (O-18 ng ml-'). The detection limit (S/N = 31 was 4.0x 10~ 'mol I-' (0.18 ng ml-'), and the relative standard deviation was 1.0% (at 2.0x 10P7mol 1-l nitrite, 10 determinations). This method has been applied to the determination of nitrite in rain, tap and spring water without any pretreatment.