Silver nanoparticles have been used in several kinds of household water purification filters due to their antimicrobial properties. However, the release of silver nanoparticles can lead to undesirable health effects and filter deactivation over time. Developing an analytical method for monitoring the release of silver nanoparticle is important from both health and ecological risk perspective. Single particle inductively coupled plasma mass spectrometry (spICP-MS) is an emerging techniques which can provide information of particle size, size distribution, number concentration, and composition. However, the presence of dissolved ion can lead to inaccurate particle information. In this study, an on-line electrodialyzer-spICP-MS for accurate measurement of silver nanoparticle release from household water purification filters was developed. The electrodialyzer-spICP-MS not only can effectively remove the dissolved silver ion (concentration from 1- 5 ppb) and other metal ions (Na+, K+, Mg2+, and Ca2+), but also show almost 100 % transport efficiency when particle passed through electrodialyzer. Three brands of silver nanoparticle containing water filters were tested for release experiment. All three filters showed both silver ion and nanoparticle released. In addition, the electrodialyzer-spICP-MS for accurate measurement of silver nanoparticle was demonstrated.

On-line detection of Ag nanoparticles released from household water purification filters by electrodialyzer-single particle ICP-MS

256th National Meeting (2018)

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