Evaluation of phytotoxicity of contaminated soils and solid waste
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概要
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Recently, there are many problems on soil contamination by hazardous chemicals, such as PCBs (Poly chlorinated biphenyls) and heavy metals. For taking an effective countermeasure based on measurements of toxicities of contaminated soils, it is necessary to employ various bioassays. Terrestrial plant bioassays can directly determine the toxicity without any leaching test. In addition to evaluate the toxicity of contaminated soil against terrestrial plants, Lemna growth inhibition test and Algae growth inhibition test were applied to contaminated soil leaching test samples. Toxicities of PCBs contaminated soil, fly ash and bottom ash were observed within the concentration range tested by filter test (6.25-100vol.%). The results of toxicity tests using terrestrial plants, showed significant differences in sensitivity among the plant species, Oryza sativa, Raphanus sativus, and Lactuca sativa. The over-growth occurred in low concentration range on the assay of each plants. The results of pot test were not correlated with the results of filter test. Because liquid/solid (L/S) ratio of pot and filter tests was different and amount of leached lead was also different each other. The clarification of PCBs by isopropanol was observed by the evaluation using terrestrial plant assay. Lemna gibba and Pseudokirchneriella subcapitata NIES35 were more sensitive species than terrestrial plants to detect the ecotoxicity of eluates of fly and bottom ashes.
- 社団法人 環境科学会の論文
社団法人 環境科学会 | 論文
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