Year: 2008
Type: article
Abstract: The potential inhibitory effect of five azo dyes on ammonia-N oxidation was investigated. Ammonia-N oxidation was inhibited by the dyes: Mordant Black 17, Direct Red 2, Reactive Red 4, Reactive Yellow 2 and Direct Blue 14 at the concentrations (0.01mgL-1 to 100mgL-1) tested. Inhibition of ammonia-N oxidation increased with increasing concentration of the toxicants. The EC50 values obtained were; 0.208 (Mordant Black 17), 1.813 (Direct Red 2), 7.926 (Reactive Yellow 2), 50.174 (Direct Blue 14) and 332.208 (Reactive Red 4). The results obtained were attributed to any/or all of the following factors: molecular size, impurities in the toxicants and metallic ions. The potential adverse ecological impact of the azo dyes on the productivity of ecosystems is discussed. Keywords: inhibitory effect, azo dyes, Nitrosomonas, ammonia oxidation. AJAZEB Vol. 7 2005: pp. 61-67
Authors: C J Ogugbue, N A Oranusi
Language: English
Subfield: Health, Toxicology and Mutagenesis
Field: Environmental Science
Domain: Physical Sciences
Open Access status: bronze
OpenAlex ID: W2012244606