Effect of Spent Lubricant on the Mortality rate of Earthworm (Lumbricus terrestris) in Obio/Akpor L.G.A, Rivers State
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Author(s)
Abstract
A 4- week toxicological study was conducted to ascertain the effect of spent lubricant on the mortality rate and physiological function of Earthworm (Lumbricus terrestris). A total of 50 Earthworms of weight ranging from 0.3g-0.7g each were collected and acclimated in a test soil for 2 weeks after which they were used for acute and sub-lethal bioassay. The experiment which consisted of five groups and four treatments were laid out in a randomized block design. An acute toxicity test at concentration of 0ml/kg (control); 50ml/kg; 100ml/kg; 200ml/kg and 400ml/kg with an exposure period of 96 hours was carried out. Similarly, sub-lethal toxicity test was also conducted for a period of 30 days at a concentration of 0ml/kg (control), 7ml/kg, 13ml/kg, 20ml/kg and 27ml/kg respectively. Results revealed that in both tests, Lumbricus terrestris were sensitive to varying concentrations of used lubricants but were able to survive for a few hours at concentrations higher than 100ml/kg. The study revealed that Earthworm survival could serve as suitable indices to assess engine oil pollution in soil.
Keywords
Earthworm, acute toxicity, sub-lethal toxicity, spent lubricant, concentrations
Cite this paper
Daniel, U.I, Otu, P.,
Effect of Spent Lubricant on the Mortality rate of Earthworm (Lumbricus terrestris) in Obio/Akpor L.G.A, Rivers State
, SCIREA Journal of Environment.
Volume 3, Issue 5, October 2019 | PP. 185-193.
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