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2006•Trace Elements ScienceRequires access

Determination of Trace Nitrite by Catalytic Spectrophotometry

Chengping Li

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Abstract

A new catalytic spectrophotometic method for determination of trace nitrite was developed.The method is based on the catalytic effect of NO~-_2 on oxidation of bromophenol red by potassium bromate in H_3PO_4 mediun.The detection limit for nitrite is 0.58×10~-6 g/L.The linear range of the determination is 0.5×10~-6～20×10~-6 g/L and the recoveries are between 96%～104%.The method was applied to direct determination of nitrite in food with satisfactory results.

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What this paper is about

A new catalytic spectrophotometic method for determination of trace nitrite was developed.The method is based on the catalytic effect of NO~-_2 on oxidation of bromophenol red by potassium bromate in H_3PO_4 mediun.The detection limit for nitrite is 0.58×10~-6 g/L.The linear range of the determination is 0.5×10~-6～20×10~-6 g/L and the recoveries are between 96%～104%.The method was applied to direct determination of nitrite in food with satisfactory results.

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Available abstract

A new catalytic spectrophotometic method for determination of trace nitrite was developed.The method is based on the catalytic effect of NO~-_2 on oxidation of bromophenol red by potassium bromate in H_3PO_4 mediun.The detection limit for nitrite is 0.58×10~-6 g/L.The linear range of the determination is 0.5×10~-6～20×10~-6 g/L and the recoveries are between 96%～104%.The method was applied to direct determination of nitrite in food with satisfactory results.

Key concepts: Potassium bromate, Nitrite, Chemistry, Bromate, Detection limit, Spectrophotometry, Catalysis, Bromophenol blue

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