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Article Title: Toxicity Assessment of a Local textile Effluent using Onion bulbs (Allium cepa L.) O. O. Ogunlaja a, b, A.


Textile wastewater is composed of large variety of dyes and chemical additions which could be deleterious in the environment. The industries’ processes are based on chemical reactions in liquid medium which generates large volume of toxic wastewater. The Itokun textile industry is a local industry where untreated effluents are discharged into the environment. This study investigated the potential genotoxicity of a local textile effluent, and also determined its physico-chemical properties using the Allium cepa assay and Atomic absorption spectrophotometer respectively. Different concentrations (0%, 1%, 5%, 10%, 25%, 50%, 75% and 100%) of the effluent were employed in the A. cepa assay for 72hrs to determine the macroscopic and microscopic effects on the roots. The macroscopic analysis showed a significant dose-dependent decrease in root length with increase in concentration from 0-5%, whereas a total growth inhibition was observed in 10-100% concentrations. The EC50 value observed was 0.5%. The cytological analysis showed chromosomal aberration like stickiness, laggards and chromosome clumps. This signs of toxicosis may be attributed to the nature of chemicals inherent in the textile effluents.