Study on the effects of humic and fulvic acids on quantum dot nanoparticles using capillary electrophoresis with laser-induced fluorescence detection.

摘要: The increasing production and use of quantum dot (QD) nanoparticles have caused concerns on the possibility contaminating aquatic terrestrial ecosystems with wastes that may contain QDs. Therefore, studies behavior QDs upon interaction components natural environment become interest. This study investigated fluorescence electrophoretic mobility carboxylic or amine polyethylene glycol (PEG)-functionalized CdSe/ZnS in presence two humic substances (HS), Suwannee River fulvic acids, using capillary electrophoresis laser-induced detection. Results showed initial enhancement at onset HS, followed by quenching longer exposure HS (>30 min). It was also observed increases concentration suggesting an increase ratio charge to hydrodynamic size nanoparticles. To determine if degraded QD-HS mixtures were dialyzed separate free Cd2+ from intact QDs, analysis solutions inductively coupled plasma-mass spectrometry. suggested degradation did not occur within period incubation.