Alex A Enuneku1
Lawrence I Ezemonye2
1Department of Animal and Environmental Biology, Faculty of Life Sciences;
2Ecotoxicology and Environmental Forensic Unit, National Centre for Energy and Environment, Energy Commission of Nigeria, University of Benin, Nigeria.
For correspondence:- Alex Enuneku
Published: 30 December 2014
Enuneku AA, Ezemonye LI, Ajieh M.
Histopathological Effects of Spent Oil Based Drilling Mud and Cuttings on the Earthworm, Aporrectodea longa. J Sci Pract Pharm 2014; 1(1):20-24
© 2014 The author(s).
This is an Open Access article that uses a funding model which does not charge readers or their institutions for access and distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0) and the Budapest Open Access Initiative (http://www.budapestopenaccessinitiative.org/read), which permit unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited..
Purpose: To evaluate the histopathological effects of spent oil based drilling mud and cuttings on Aporrectodea longa.
Methods: The earthworm, Aporrectodea longa, was exposed to different concentrations of suspended particle phase (SPP) of drilling mud and cutting, collected from an abandoned oil drilling site in Mpanak, Niger Delta Region, for 28 days. Toxicological effects on the annelid was evaluated using standard procedure.
Results: At the end of the exposure, bioaccumulation of the toxic chemical constituents of the drilling mud (heavy metals and total hydrocarbons) increased (p<0.05) in whole tissue of earthworm with increase drilling mud concentration. Histopathological changes in the crop, gizzard and intestine of earthworms were moderate necrosis in the lower concentrations and severe necrosis in the higher concentrations.
Conclusion: The results of this study have shown that drilling mud and cuttings could cause serious health risk to Aporrectodea longa. The discharge of drilling mud into the terrestrial ecosystems should be discouraged or adequate treatment options for detoxification should be employed prior to discharge
Drilling mud; Toxicology; Heavy metals; Hydrocarbons; Histology; Annelid