Development and application of a novel whole sediment toxicity test using immobilized sediment and Chlorella vulgaris
| Autor: | Ran Yu, Meng Zhang, Rou-Rou Xu, Liwei Sun, Jing Zhang, Zhou-Tao Pei, Li-Ling Zhang, Wen-Qian Wang, Wen-Qiang Wang, Han-Yang Liu |
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| Rok vydání: | 2019 |
| Předmět: |
Pollution
Geologic Sediments Alginates Health Toxicology and Mutagenesis media_common.quotation_subject Chlorella vulgaris 0211 other engineering and technologies 02 engineering and technology 010501 environmental sciences 01 natural sciences Calcium Chloride Algae Rivers Toxicity Tests Bioassay 0105 earth and related environmental sciences EC50 media_common Pollutant 021110 strategic defence & security studies biology Chemistry Public Health Environmental and Occupational Health Sediment General Medicine biology.organism_classification Environmental chemistry Diuron Toxicity Copper Water Pollutants Chemical |
| Zdroj: | Ecotoxicology and environmental safety. 189 |
| ISSN: | 1090-2414 |
| Popis: | The sediments of water bodies are not only pollutants sink but also sources of pollution. The assessment for the whole-sediment toxicity is still challenging research. Although the application of immobilized algal bead could overcome the practical difficulties in sediment toxicity assay, the weak growth and reduced sensitivity of algae inside the bead restricted its application. In this study, a sediment toxicity test was developed using immobilized sediment and Chlorella vulgaris. The immobilized sediment was prepared by mixing 2 g freeze-dried sediment and 15-mL 3% (w/v) alginate and hardened in a 4% (w/v) CaCl2 solution. Based on a C. vulgaris growth inhibition test and using the immobilized sediment, the median effective concentration value (EC50) of the spiked Cu and diuron was 506.23 and 2.37 mg/kg respectively, lower than that of using immobilized algae (719.62 and 3.12 mg/kg respectively). The Cu and diuron concentrations in the corresponding overlying water from the spiked immobilized and free sediment showed that sediment pollutants' diffusion capacity was not decreased after immobilization. By using the immobilized sediment in algae toxicity bioassay, the changes in the sediment toxicity of a polluted river before and after dredging was evaluated. The C. vulgaris growth inhibition in sediment A decreased from 81.94% to 8.43%; sediment B remained unchanged; sediment C stimulated the growth of C. vulgaris before dredging (−15.56%), but inhibited the algae growth after dredging (26.88%), and sediment D decreased growth inhibition from 32.66% to −12.60%. |
| Databáze: | OpenAIRE |
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