Statistical evaluation of biodegradation of news ink vehicles and ink formulations
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Soybean oil, commercial news ink vehicles—consisting of either soy or mineral oil and petroleum resins—and United States Department of Agriculture’s (USDA) 100% modified soy oil-based vehicles were subjected to biodegradation. Soybean oil and each vehicle were inoculated with monocultures and a mixed culture of Aspergillus fumigatus, Penicillium citrinum, and Mucor racemosus. Fermentations were allowed to proceed for 5, 12, and 25 d. Results show that, in 25 d, soy oil was degraded the most, followed by the USDA’s ink vehicles (USDA I–III), Newspaper Association of America’s (NAA) hybrid soy oil-based and commercial mineral oil-based vehicles. Some differences were found in the abilities of the cultures to degrade the different inks. Color did not appear to affect the degradation rate in soy oil, the USDA inks, or the NAA ink but was a factor in the commercial ink.
Key WordsBiodegradation ink vehicle news ink statistical vehicle soybean oil
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