2024, Vol. 5, Issue 2, Part C
Ecotoxicity of the oil spill dispersant sea care on Nitrobacter vulgaris and Nitrosomonas halophila isolated in different aquatic environment
Author(s): Awortu RC, Wemedo SA, Douglas SI and Nrior RR
Abstract: Oil spills are a significant environmental concern, particularly due to the potential toxicity of the oil dispersants used for remediation. This study investigated the ecotoxicity of the oil spill dispersant Sea Care on Nitrobacter vulgaris and Nitrosomonas halophila which play key roles in the nitrogen cycle. The bacteria were isolated from water sample collected from the root of mangrove in the aquatic environment. Freshwater, estuarine water and marine water were collected from Adoni Local Government Area, Rivers State. The Sea Care dispersant was prepared in 5, 25, 50 and 75% concentrations with a control 0%. These concentrations were introduced into the labelled flasks containing the respective sterile water. One milillitre of the test isolates was introduced into the toxicants and these was monitored for 24 hours. The lethal concentration and % survival was determined using standard method. Results revealed a concentration-dependent inhibition of Nitrosomonas halophila and Nitrobacter vulgaris. There was no significant difference (p>0.05) of the dispersant on Nitrobacter vulgaris and N. halopila. The percentage survival of N. vulgaris in marine, estuarine and fresh water 74.32±11.30 to 100±0.0, 75.30±6.24 to 100±0.0 and 63.99±10.21 to 100.0±0.0%, respectively, while the percentage survival of N. vulgaris in marine, estuarine and fresh water was 62.24±18.7 to 100±0.0, 62.24±13.92 to 100±0.0 and 62.24±13.92 to 100±0.0%, respectively. There was a significant difference (p<0.05) on the different concentrations of the toxicant in the respective aquatic environment. The LC50 for N. vugaris range was 72.24-73.01, while for N. halophila it was 72.08-72.99. The Sea Care dispersant had high LC50 which implied that it could only be toxic in higher concentration.
Pages: 185-190 | Views: 162 | Downloads: 78
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How to cite this article:
Awortu RC, Wemedo SA, Douglas SI, Nrior RR. Ecotoxicity of the oil spill dispersant sea care on Nitrobacter vulgaris and Nitrosomonas halophila isolated in different aquatic environment. J Adv Microbiol Res 2024;5(2):185-190.
