Fading of alizarin and related artists' pigments by atmospheric ozone: reaction products and mechanisms

Autor:	James R. Druzik, Daniel Grosjean, Paul M. Whitmore, C. Pamela De Moor, Glen R. Cass
Rok vydání:	1987
Předmět:	Ozone Silica gel Inorganic chemistry General Chemistry Alizarin Anthraquinone chemistry.chemical_compound Pigment Phthalic acid chemistry Reagent visual_art visual_art.visual_art_medium Environmental Chemistry sense organs Benzoic acid
Zdroj:	Environmental Science & Technology. 21:635-643
ISSN:	1520-5851 0013-936X
DOI:	10.1021/es00161a003
Popis:	The colorants alizarin and Alizarin Crimson (a calcium- aluminum lake pigment) and their simple structural homologue anthraquinone were deposited on silica gel, cellulose, and Teflon substrates and exposed in the dark to ozone in purified air (~0.4 ppm O_3 for 95 days and ~10 ppm O_3 for 18-80 h). Exposed and control samples were analyzed by mass spectrometry. Alizarin Crimson reacted with ozone on all substrates, yielding phthalic acid {major), benzoic acid (minor), and other minor and unidentified products. Anthraquinone did not react with ozone irrespective of conditions. Alizarin did not react on Teflon or cellulose but reacted on silica gel to yield phthalic acid (major) and other products. A chemical mechanism responsible for the fading of these alizarin-related colorants by ozone is suggested that is consistent with the products distribution, the observed reactivity sequence, and the observed substrate-specific effects. The possible application of this work to predicting the ozone fastness of other alizarin-related pigments is discussed briefly.
Databáze:	OpenAIRE
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