Publisher: Chemical Society of Nigeria

Ecological Effects of Norust Cr 486 (CORROSION INHIBITOR) On Fresh and Brackish Water Cichlids: Tilapia Guineensis

D. F Ogeleka, L. I. N Ezemonye, F. E Okieimen.
KEYWORDS: Toxicity; Corrosion inhibitor; Fish; Tilapia guineensis

ABSTRACT:

Short-term toxic effects of uncontrolled release / discharge of Norust CR 486 into the Niger Delta environment of Nigeria were investigated using laboratory toxicity test. Tilapia guineensis (fish) were exposed to Norust CR 486 (corrosion inhibitor) concentrations of 6.25, 12.5, 25, 50 and 100 mg/l for 96 h. The mean % mortality obtained from the study resulted in adverse effects on most of the test organisms. The estimated lethal concentration (LC50) obtained using the Finney Probit analysis revealed that the test chemical was slightly toxic to the test organisms based on the Group of Expert on Scientific Aspect of Marine Pollution (GESAMP) rating. Although, the LC50 observed between the fresh and brackish water test were not significantly different, there was statistical significance between mortality in the Norust CR 486 experiment and the control treatments at levels of p < 0.05. The observed mortality effects in the test concentration are possible indications of early warning signs of water quality deterioration and ecological effects on these economically viable species. This effect could possibly lead to a high distortion and imbalance of the aquatic ecosystem


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