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