Abstract
A simple and sensitive spectrophotometric method for determination of nitrite has been described. The method is based on the oxidation of brilliant cresyl blue (BCB) by nitrite in acidic medium, which results in the decrease in absorbance at 636 nm. The decrease in absorbance is directly proportional to nitrite concentration obeying Beer’s law. The sensitivity is largely enhanced in the presence of β-cyclodextrin (β-CD) because of inclusion complexation. It was calculated that β-CD and BCB could form 1:1 inclusion complexation with a formation constant of 546.6 L/mol. Linear calibration graphs were obtained for 0.02 × 10−3–0.8 × 10−3 g/L sodium nitrite at 636 nm. The detection limit for the analytical procedure was 4.0 × 10−6 g/L sodium nitrite. The relative standard deviation for determination of 0.1 × 10−3 g/L and 0.5 × 10−3 g/L sodium nitrite were 0.69% and 0.38%, for ten determinations, respectively. Twenty-two coexistent ions or species were examined, and no serious interference for most of ions was observed. The method has been applied to determine nitrite in water and vegetable samples with satisfactory results.
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The authors acknowledge the Natural Science Foundation of China for financial supports (Grant No., 20875069).
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Jiang, ZT., Guo, YX. & Li, R. Spectrophotometric Determination of Trace Nitrite with Brilliant Cresyl Blue Using β-Cyclodextrin as a Sensitizer. Food Anal. Methods 3, 47–53 (2010). https://doi.org/10.1007/s12161-009-9079-y
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DOI: https://doi.org/10.1007/s12161-009-9079-y