Flow-Injection Catalytic Spectrophotometric Determination of Trace Amounts of Nitrite

A flow-injection catalytic spectrophotometric method is proposed for the determination of nitrite based on its catalytic effect on potassium bromate oxidation of acridine orange in phosphoric acid medium. The reaction is monitored spectrophotometrically by measuring the decrease in absorbance of acr...

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Bibliographic Details
Published inAnalytical letters Vol. 32; no. 14; pp. 2887 - 2897
Main Authors Chen, Hui, Fang, Yan-jun, An, Tai-cheng, Jin, Xing-long
Format Journal Article
LanguageEnglish
Published Philadelphia, PA Taylor & Francis Group 01.01.1999
Taylor & Francis
Subjects
acridine orange
Analytical chemistry
catalytic method
Chemistry
Exact sciences and technology
Flow-injection analysis
nitrite
Spectrometric and optical methods
spectrophotometry
Trace analysis
Catalytic reaction
Chemical analysis
Interelement effect
Nitrites
Kinetic method
Foodstuff
Acridine dye
Inorganic anion
Environmental materials
Concentration effect
Oxidation
Flow injection
Ultraviolet visible spectrometry
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Summary:A flow-injection catalytic spectrophotometric method is proposed for the determination of nitrite based on its catalytic effect on potassium bromate oxidation of acridine orange in phosphoric acid medium. The reaction is monitored spectrophotometrically by measuring the decrease in absorbance of acridine orange at 491.5 nm coupling with the stopped-flow technique. The calibration curve was linear between 3.4 and 65 ng/mL, and the detection limit was 2.2 ng/mL. Up to 30 samples can be analyzed per hour with a relative precision of ca. 1.9%. The proposed method was successfully applied to the determination of nitrite in waters and food samples with satisfactory results.
ISSN:0003-2719
1532-236X
DOI:10.1080/00032719908543013