Laboratory Scale Microbial Food Chain To Study Bioaccumulation, Biomagnification, and Ecotoxicity of Cadmium Telluride Quantum Dots
| Autor: | Govind Sharan Gupta, Ashutosh Kumar, Violet Aileen Senapati, Alok K. Pandey, Alok Dhawan, Rishi Shanker |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Food Chain
Paramecium Biomagnification chemistry.chemical_element 02 engineering and technology 010501 environmental sciences medicine.disease_cause 01 natural sciences Quantum Dots Cadmium Compounds Escherichia coli medicine Environmental Chemistry 0105 earth and related environmental sciences Paramecia Cadmium biology General Chemistry 021001 nanoscience & nanotechnology biology.organism_classification Cadmium telluride photovoltaics Nanostructures chemistry Bioaccumulation Environmental chemistry Paramecium caudatum Tellurium Ecotoxicity 0210 nano-technology |
| Zdroj: | Environmental Science & Technology. 51:1695-1706 |
| ISSN: | 1520-5851 0013-936X |
| DOI: | 10.1021/acs.est.6b03950 |
| Popis: | The increasing applications of engineered nanomaterials (ENMs) in consumer products warrant a careful evaluation of their trophic transfer and consequent ecological impact. In the present study, a laboratory scale aquatic microbial food chain was established using bacteria (Escherichia coli (E. coli)) as a prey and ciliated protozoan (Paramecium caudatum) as a predator organism to determine the impact of cadmium telluride quantum dots (CdTe QDs). We observed that 29% of bacterivory potential of paramecium was lost, including an ∼12 h delay in doubling time on exposure to 25 mg/L CdTe QD (∼4 nm) as compared to control. The fluorescence based stoichiometric analysis revealed that 65% of the QDs bioaccumulated when paramecia were exposed to 25 mg/L QDs at 24 h. There was a significant (p0.05) increase in cellular cadmium (Cd) concentration at 24 h (306 ± 192 mg/L) as compared to 1 h (152 ± 50 mg/L). Moreover, the accumulation of Cd in E. coli (147 ± 25 mg/L) at 1 h of exposure to 25 mg/L QDs transferred 1.4 times higher Cd (207 ± 24 mg/L; biomagnification factor = 1.4) to its predator, paramecium. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|