DETERMINATION OF NITRITE IN WATER USING ANILINE SULPHATE AND NAPTHOl METHOD

G. F. Ibikunle, E. O. Adelani

Abstract


Nitrite (NO2), occurs naturally in the environment as an intermediate of the nitrogen cycle through microbial decomposition of organic matter. The determination of concentration of nitrite in water body using Cadmium Reduction method test kit which is costly and not easily available is urgently needed alternatives. The aim of this research is to develop a new method using aniline sulphate and napthol for determination of nitrite concentration in water and compare it with the use of Cadmium Reduction method (Hach Dr890) test kit. The samples for the research were taken from F.U.T Minna fish ponds and seasonal stagnated pools from river that flow through the campus. The absorbance of standard nitrite concentration was scanned to determine the wavelength for aniline sulphate and napthol method colouration. The prepared standard concentration of nitrite absorbance and samples were observed at 390 nm. The Cadmium Reduction method was equally carried out on the prepared standard nitrite and the samples as well as with the new aniline sulphate and napthol method. Aniline sulphate and napthol method obeyed Beer-Lambert’s law when tested on prepared standard nitrite. The Cadmium Reduction method did not obey Beer-Lambert’s law on the prepared standard nitrite. Comparatively, the result obtained from different fish ponds water indicated that  the new method had a concentration ranges from 44.8 to 2.7 ppm while the Cadmium Reduction method (Hach Dr890) was in the range of 19.82 to 0.011mg/l. This aniline sulphate/Napthol method could be considered as a new azo dye method that could be used for the analysis of nitrite in water sample.

Key Aniline Sulphate/Napthol, Beer-Lambert’s law, Cadmium Reduction, Nitrite


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Chemical Society of Nigeria