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A new sensor has been developed for the determination of nitrite based on the immobilization of Lauth’s violet on triacetyl cellulose membrane using absorption spectrophotometry. The optical sensor signal is based on the reaction of Lauth’s violet with bromate as an oxidant in the presence of nitrite to produce a colorless product. Nitrite has a strong catalytic effect on the oxidation of Lauth’s violet with bromate in acidic media. The difference in the absorbance of the optode at 617 nm between uncatalyzed and catalyzed reactions (ΔA) was directly proportional to the concentration of nitrite in sample solution. A linear calibration curve (r= 0.985) was observed in the nitrite concentration range of 10.12 – 1012 ng mLand a detection limit of 8.3 ng mLwas found.
| Authors: | Ali A. Ensafi, M. Amini | |
| Journal: | Food Chemistry | |
| Year: | 2011 | |
| DOI: | 10.1016/j.foodchem.2011.11.120 | |
| Publication date: | 06-12-2011 |
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