Molecular emission cavity analysis: Part 23. Determination of Nitrite and Nitrate after Conversion to Nitrogen Monoxide |
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| Authors: | IZ Al-Zamil Alan Townshend |
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| Institution: | Department of Chemistry, University of Birmingham, P.O. Box 363, Birmingham B15 2TT Gt. Britain;Department of Chemistry, University of Hull, Hull HU6 7RX Gt. Britain |
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| Abstract: | Molecular emission cavity analysis is applied to the determination of nitrite and nitrate after their reduction to nitrogen monoxide by iodide or zinc. The white emission stimulated from nitrogen monoxide in an oxy-cavity placed in a hydrogen—nitrogen diffusion flame is measured at 526 nm. Calibration graphs are linear up to 300 μg N ml-1; the detection limit is 0.5 μg N ml-1 for nitrite and 2 μg N ml-1 for nitrate. There are few interferences. Procedures for the determination of nitrite and nitrate in admixture are described. |
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