Journal
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
Volume 22, Issue 12, Pages 8890-8901Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s11356-014-3403-9
Keywords
Used motor oil; Water-accommodated fraction (WAF); Pseudokirchneriella subcapitata; Superoxide dismutase; Catalase; Peroxidase
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Funding
- Australian Government, University of South Australia through an IPRS scholarship
- CRC for Contamination Assessment and Remediation of the Environment
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Although used motor oil from automobiles is one of the major pollutants through storm water in urban environments leading to contamination of water bodies, very little information is available on its toxicity towards growth of microalgae. Also, to our knowledge, there are no data on the used motor oil-induced oxidative stress in microalgae. We therefore investigated the toxicity of used and fresh motor oil on growth and antioxidant enzymes of a microalga, Pseudokirchneriella subcapitata. In general, used oil was more toxic to the alga than fresh oil. Used oil at 0.20 % inhibited algal growth, measured in terms of chlorophyll a, by 44 % while fresh oil was nontoxic up to 2.8 %. Water-accommodated fraction (WAF) of the used oil at > 50 % concentration exhibited significant toxicity while WAF from fresh oil was nontoxic even up to 100 %. Used oil and its WAF, even at lower concentrations, increased the levels of antioxidant enzymes indicating algal response to the toxicity stress. When the alga was exposed to WAF from fresh motor oil, no alterations in the antioxidant enzyme levels were evident. The present investigation suggests that contamination of aquatic systems with used oil could potentially affect the ecosystem health via disruption of primary producers that are located at the base of the food chain.
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