Multimethod quantification of Ag+ release from nanosilver
Madjid Hadioui1, Simon Leclerc, Kevin J Wilkinson
1Department of Chemistry, University of Montreal C.P. 6128, Succursale Centre-Ville Montreal, Canada.
Talanta
|April 20, 2013
Summary
Determining free silver ions (Ag+) released from silver nanoparticles (nAg) is crucial for understanding environmental and health impacts. Dilution significantly affects Ag+ release, highlighting the need for precise measurement conditions.
Area of Science:
- Environmental Science
- Nanotechnology
- Analytical Chemistry
Background:
- Nanomaterials, such as silver nanoparticles (nAg), raise concerns regarding environmental and human health effects.
- Toxicity of nAg may stem from the release of free silver ions (Ag+).
- Accurate quantification of free Ag+ in nAg suspensions is essential for risk assessment.
Purpose of the Study:
- To evaluate the ion-exchange technique (IET) for determining free Ag+ in nAg suspensions.
- To investigate the influence of sample dilution on Ag+ release from nAg.
- To establish precise measurement conditions for toxicological and environmental fate studies.
Main Methods:
- Ion-exchange technique (IET)
- Centrifugal ultrafiltration
- Single particle inductively coupled plasma mass spectrometry (SP ICP-MS)
- Analysis of commercial nAg suspensions
Main Results:
- The ion-exchange technique effectively distinguished free Ag+ from nAg.
- Low detection limits for Ag+ were achieved, suitable for natural samples.
- Sample dilution significantly increased the relative release of Ag+ from nAg.
Conclusions:
- Precise determination of free Ag+ is critical for accurate toxicological and environmental fate assessments.
- The ion-exchange technique is a promising method for quantifying free Ag+ in complex matrices.
- Understanding the impact of dilution on Ag+ release is vital for experimental design.
