Ultra-trace analysis of nitrite in food samples by flow injection with spectrophotometric detection |
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| Authors: | A A Ensafi and G Bagherian Dehaghei |
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| Institution: | (1) College of Chemistry, Isfahan University of Technology, Isfahan, Iran, IR |
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| Abstract: | A flow injection system with spectrophotometric detection is proposed for the determination of low levels of nitrite based
on its catalytic effect on the oxidation of gallocyanine by bromate in acidic media. Various analytical parameters such as
acidity, reagent concentration, flow rate, sample size, time, temperature, and interfering species were studied. The calibration
graph was linear for 0.020–0.500 μg/mL of nitrite. The method is successfully applied to food samples. Up to 30 ± 5 samples
can be analyzed per hour.
Received: 8 April 1998 / Revised: 3 June 1998 / Accepted: 31 July 1998 |
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