Test methods in analytical chemistry: Separate colorimetric determination of copper and zincстатья
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:The optimum conditions were determined for the adsorption of copper(II) and zinc(II) on silica modified with 1-(2-pyridylazo)-2-naphthol (SC-PAN). Some methodological aspects of the measurement and processing of analytical signals in colorimetry were considered. It was shown that test scales must be constructed in accordance with the criterion of the total color difference (Delta E) perceived by the human eye. With the use of diffuse-reflectance spectroscopy, Delta E=10. Colorimetric procedures were developed for the determination of (0.4-22.0)x10(-6)% of copper and (3.8-39.0)x10(-6)% of zinc in a 10-mL aliquot portion of natural water.