Comparative investigation of toxicity and bioaccumulation of Cd-based quantum dots and Cd salt in freshwater plant Lemna minor L
Language English Country Netherlands Media print-electronic
Document type Comparative Study, Journal Article
PubMed
28858706
DOI
10.1016/j.ecoenv.2017.08.053
PII: S0147-6513(17)30552-3
Knihovny.cz E-resources
- Keywords
- Bioaccumulation, Cadmium, Laser-Induced Breakdown Spectroscopy, Lemna minor L., Quantum dots, Toxicity,
- MeSH
- Adsorption MeSH
- Araceae drug effects growth & development metabolism MeSH
- Biomass MeSH
- Water Pollutants, Chemical chemistry toxicity MeSH
- Cadmium Chloride metabolism toxicity MeSH
- Glutathione chemistry MeSH
- Quantum Dots metabolism toxicity MeSH
- 3-Mercaptopropionic Acid chemistry MeSH
- Environmental Monitoring methods MeSH
- Fresh Water chemistry MeSH
- Cadmium Compounds metabolism toxicity MeSH
- Tellurium metabolism toxicity MeSH
- Models, Theoretical MeSH
- Publication type
- Journal Article MeSH
- Comparative Study MeSH
- Names of Substances
- cadmium telluride MeSH Browser
- Water Pollutants, Chemical MeSH
- Cadmium Chloride MeSH
- Glutathione MeSH
- 3-Mercaptopropionic Acid MeSH
- Cadmium Compounds MeSH
- Tellurium MeSH
The purpose of this study was to determine the toxicity of two different sources of cadmium, i.e. CdCl2 and Cd-based Quantum Dots (QDs), for freshwater model plant Lemna minor L. Cadmium telluride QDs were capped with two coating ligands: glutathione (GSH) or 3-mercaptopropionic acid (MPA). Growth rate inhibition and final biomass inhibition of L. minor after 168-h exposure were monitored as toxicity endpoints. Dose-response curves for Cd toxicity and EC50168h values were statistically evaluated for all sources of Cd to uncover possible differences among the toxicities of tested compounds. Total Cd content and its bioaccumulation factors (BAFs) in L. minor after the exposure period were also determined to distinguish Cd bioaccumulation patterns with respect to different test compounds. Laser-Induced Breakdown Spectroscopy (LIBS) with lateral resolution of 200µm was employed in order to obtain two-dimensional maps of Cd spatial distribution in L. minor fronds. Our results show that GSH- and MPA-capped Cd-based QDs have similar toxicity for L. minor, but are significantly less toxic than CdCl2. However, both sources of Cd lead to similar patterns of Cd bioaccumulation and distribution in L. minor fronds. Our results are in line with previous reports that the main mediators of Cd toxicity and bioaccumulation in aquatic plants are Cd2+ ions dissolved from Cd-based QDs.
References provided by Crossref.org
Laser-induced breakdown spectroscopy as a novel readout method for nanoparticle-based immunoassays
Time-Dependent Growth of Silica Shells on CdTe Quantum Dots