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Kinetic Determination of Trace Nitrite by Catalytic Spectrophotometry

Wang Li

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Abstract

A new kinetic spectrophotometric method for the determination of trace nitrite has been developed. The method is based on the catalytic effect of trace nitrites on oxidation of indigo carmine with potassium periodate in dilute sulfuric acid solution. The detection limit for nitrite is 0.072 μg/L with linear range of 0～4.0 μg/L. The method has been applied to the determination of trace nitrite in water samples. The results are in (agreement) with those provided by Griess method with precision of 2.9%RSD(n=6).

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What this paper is about

A new kinetic spectrophotometric method for the determination of trace nitrite has been developed. The method is based on the catalytic effect of trace nitrites on oxidation of indigo carmine with potassium periodate in dilute sulfuric acid solution. The detection limit for nitrite is 0.072 μg/L with linear range of 0～4.0 μg/L. The method has been applied to the determination of trace nitrite in water samples. The results are in (agreement) with those provided by Griess method with precision of 2.9%RSD(n=6).

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Available abstract

A new kinetic spectrophotometric method for the determination of trace nitrite has been developed. The method is based on the catalytic effect of trace nitrites on oxidation of indigo carmine with potassium periodate in dilute sulfuric acid solution. The detection limit for nitrite is 0.072 μg/L with linear range of 0～4.0 μg/L. The method has been applied to the determination of trace nitrite in water samples. The results are in (agreement) with those provided by Griess method with precision of 2.9%RSD(n=6).

Key concepts: Potassium periodate, Nitrite, Chemistry, Spectrophotometry, Indigo carmine, Detection limit, Sulfuric acid, Catalysis

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