Scientific Article
previous document  unige:43551  next document
add to browser collection
Title

Selective identification, characterization and determination of dissolved silver(i) and silver nanoparticles based on single particle detection by inductively coupled plasma mass spectrometry

Authors
Laborda, Francisco
Bolea, Eduardo
Castillo, Juan R.
Published in Journal of Analytical Atomic Spectrometry. 2011, vol. 26, no. 7, p. 1362-1371
Abstract The different behaviours of dissolved silver and silver nanoparticles under ICP-MS single particle detection conditions have been used to differentiate directly between both forms of silver in aqueous samples. Suspensions containing silver nanoparticles at number concentrations below 10^9 L-1 and/or dissolved Ag(I) are introduced into the ICP-MS by conventional pneumatic nebulization and measured with a time resolution of 5 ms. Each silver nanoparticle is converted in the ICP into a packet of ions, which are detected as a single pulse, whose intensity is proportional to the number of silver atoms in the nanoparticle, whereas dissolved silver produces pulses of averaged constant intensity. The frequency plots with respect to the intensity measured for each pulse show independent distributions for dissolved silver and silver nanoparticles, whose profiles are also different (Poisson and lognormal, respectively). Size limits of detection for pure Ag nanoparticles of 18 nm, equivalent to a silver mass of 32 ag, were obtained. Number concentration limits of detection of 1 X 10^4 L-1 can be achieved. A methodological approach for identification, characterization and determination of mass and number concentration of dissolved Ag(I) and silver nanoparticles at environmentally relevant concentrations is presented.
Identifiers
Full text
Article (Author postprint) (573 Kb) - document accessible for UNIGE members only Limited access to UNIGE
Other version: http://xlink.rsc.org/?DOI=c0ja00098a
Citation
(ISO format)
LABORDA, Francisco et al. Selective identification, characterization and determination of dissolved silver(i) and silver nanoparticles based on single particle detection by inductively coupled plasma mass spectrometry. In: Journal of Analytical Atomic Spectrometry, 2011, vol. 26, n° 7, p. 1362-1371. https://archive-ouverte.unige.ch/unige:43551

189 hits

0 download

Update

Deposited on : 2014-12-16

Export document
Format :
Citation style :