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

Journal Article · Wed Jul 01 00:00:00 EDT 1987 · Environ. Sci. Technol.; (United States)

DOI:https://doi.org/10.1021/es00161a003· OSTI ID:6176659

Grosjean, D; Whitmore, P M; De Moor, C P; Cass, G R; Druzik, J R

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 (approx.0.4 ppm O/sub 3/ for 95 days and approx.10 ppm O/sub 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. 33 references, 5 figures.

• Research Organization: California Institute of Technology, Pasadena
• OSTI ID: 6176659
• Journal Information: Environ. Sci. Technol.; (United States), Vol. 21:7
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
ALIZARIN
CHEMICAL REACTIONS
OZONE
ENVIRONMENTAL EFFECTS
AIR POLLUTION
ATMOSPHERIC CHEMISTRY
PAINTS
PIGMENTS
SMOG
ANTHRAQUINONES
AROMATICS
CHEMISTRY
COATINGS
DYES
HYDROXY COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
POLLUTION
QUINONES
REAGENTS
500200* - Environment
Atmospheric- Chemicals Monitoring & Transport- (-1989)