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Dmitrienko S. G., Apyari V. V., Sviridova O. A., Badakova S. A., Zolotov Yu. A.

On the new approach to the theory of preferential wetting of heterogeneous solid surfaces

Abstract

It was propoused to use polyurethane foam (PUF) as solid polymer reagent for determination of nitrite. The determination is based on the diazotization of terminal toluidine groups of PUF with nitrite in acid solution, followed by azo coupling reactions of polymer cation with compounds such as 1- naphtylamine, 2,3-diaminonaphtaline, rivanole, 8-oxyguinoline, 1- and 2-naphtols. It was shown, that intensely colored polymer aso compounds, appearing in the process of diazotization and azo coupling may be useful as analytical forms for recognition of nitrite by means of diffuse reflectance spectroscopy (Cmin = n.ng/ml). The possibility of using a desktop scanner and digital гпaцe-processing software for the numerical evaluation of the color intensity of polymer aso compounds is studied. It has been found that nitrite can be determined using of a scanner with the same sensitivity as with the use of diffuse reflectance spectroscopy.
Moscow University Chemistry Bulletin.
2004, Vol. 45, No. 2, P. 131
   

Copyright (C) Chemistry Dept., Moscow State University, 2002
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