Publisher: Bachudo Science Co. Ltd

Spectrometric Determination of Ammonium- Nitroge.N With Quinol In Aqueous Medium

P. O. Okolo, J. M. Okuo
KEYWORDS: ammoniurp-nitrogen, aqueous solution, spectrometry, guinol


Quinol is proposed as a reagent for the spectrometric determination of ammonium-nitrogen (NH4 • -N) in aqueous medium. Quinol forms a pink complex with ammonium salt in aqueous medium. Hydrogen peroxide is needed for colour accentuation. The quinol/ammonium charge transfer complex has absorption maximum ( at 420nm with molar absorptivity (e) of 1.067x1<>31mor1 cm·1 . Beer's law is obeyed up to 6.0µg NH/-Nlml.The correlation coefficient (r) is 0.9962. The optimum quinol concentration and optimum pH are found to be 0.6% (mlv) and 5.00, respectrvely. The calculated sensitivity is 0.07µg NH/-Nlml. The extent of ionic interference has also been quantitativelt evaluated. The most tolerated ion is No3• (8.00x1 o..amoU-1 maximum) and the least tolerated ion is Fe (1.25x1 a 6 mo11·1 maximum). Recovery of NH/-N from spiked water sample shows results In the range of 98.49 to 99.69%. The proposed method has been applied to the determination of NH/-N in potable water. Res.ults are in good agreement with those obtained by Nessler's method. 

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