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Journal of Emerging Trends in Engineering and Applied Sciences (JETEAS)


Article Title: Response of Mucor Racemosus to Toxicity of Domestic Detergents
by Wemedo, S. A. and Nrior, R. R.

Toxicity is a measure of the degree to which something is toxic; it deals with the effect of chemical substances on organisms. The problem of contamination of aquatic environment with various brands of detergents by individuals and industries has since been in practice, as such the role of microbes in food chain and as agents of degradation of substances in the aquatic ecosystems could be hampered. This study therefore was designed to assess the potential effect of powdered and liquid domestic detergents (Bonux, Klin, Omo, Ariel, Snow Clin and Morning Fresh) on an aquatic fungus, Mucor racemosus. The test organism was isolated using a differential medium: Fungal pour RiteTM Ampoules, and identified macroscopically and microscopically. Percent Log Survival Test and Median Lethal Concentration Test of the organism were carried out with concentrations: 10, 100, 1000, 10000, 100000mg l-1 of the toxicant (domestic detergent) for 0, 4, 8, 12 and 24h, and the LC50 calculated. Percent log survival decreased with increasing concentration and exposure period of the toxicants. At 100000mg l-1 toxicant concentration, mortality rate of Mucor racemosus observed were: 100% for Klin, Omo, and Bonux at 0-24h while Ariel, Snow Clin and Morning Fresh showed 100% mortality at 4-24h exposure period. However, there is significant growth increase up to 202% log survival at 10mg l-1 concentration. The study showed that Klin had the highest toxicity strength (LC50 = 573.22ppm) while mourning fresh had the least toxicity strength (LC50 = 4993.72ppm). The results showed that increase in the concentration of domestic detergents killed the fungus, which could in turn inhibit the degradation capability of Mucor racemosus, and alter degradation process in the aquatic ecosystem. This could also lead to decreased ability of the affected ecosystem to support aquatic life. In conclusion, the study revealed that detergents had depressive effect on the aquatic fungus and that the practice of using detergents to wash household clothing and industrial materials in surface waters could cause ecotoxicological problems.
Keywords: effect, detergent, toxicant, biodegradation, log survival, aquatic ecosystem
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ISSN: 2141-7016

Editor in Chief.

Prof. Gui Yun Tian
Professor of Sensor Technologies
School of Electrical, Electronic and Computer Engineering
University of Newcastle
United Kingdom



Copyright © Journal of Emerging Trends in Engineering and Applied Sciences 2010