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http://dx.doi.org/10.7837/kosomes.2016.22.5.490

Ecological Effects of Slag Extracts on the Initial Life Cycle of the Rotifer Brachionus plicatilis and Benthic Copepod Tigriopus japonicus  

Yoon, Sung-Jin (Ulleungdo.Dokdo Ocean Science Station, Korea Institute of Ocean Science & Technology)
Publication Information
Journal of the Korean Society of Marine Environment & Safety / v.22, no.5, 2016 , pp. 490-499 More about this Journal
Abstract
In this study, the marine ecological impacts of dephosphorized slag and steel slag on the initial life cycle of the rotifer Brachionus plicatilis and benthic copepod Tigriopus japonicus (in marine trophic structure as a first consumer) exposure to slag extracts have been considered using a marine ecotoxicological assessment. In the results of a screen test on slag extracts, the pH of an undiluted solution was measured to have high alkalinity (pH 8.89-12.16), but a toxic reaction to this undiluted solution before and after aging was divided according to test species. For non-aged slag, the toxic effect ($LC_{50}$) of neonate on B. plicatilis was seen to be severe with dephosphorized slag (20.8 %) than steel slag (63.8 %) with under pH-uncontrolled conditions. The toxic values of dephosphorized and steel slag were estimated to be 35.3 % and 36.0%, respectively, for nauplius with T. japonicus. However, the toxicity of slag extracts before and after aging were different for T. japonicus than for B. plicatilis based on the characteristics of the test materials, with pH-controlled conditions. In conclusion, the results of this study suggest that slag can be relatively stable after aging and may not be likely to influence marine environments, even given repetitive extracting under pH-uncontrolled conditions. This study confirms that a marine ecotoxicological assessment method applied to mechanically activated samples can give an idea of the resistance a marine environment has against the introduction of hazardous materials due to precipitation and weathering.
Keywords
Marine ecological impact; Slag extract; Initial life cycle; Marine ecotoxicological assessment; First consumer;
Citations & Related Records
Times Cited By KSCI : 7  (Citation Analysis)
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