Real-time monitoring of the dissolution of silver nanoparticles by using a solid-contact Ag+-selective electrode

Tanji Yin, Tingting Han, Changbai Li, Wei Qin, Johan Bobacka*

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

6 Citations (Scopus)
1 Downloads (Pure)

Abstract

The dissolution kinetics of silver nanoparticles (Ag NPs) to Ag + ions is a critical factor determining the toxicity of silver nanoparticles. In this work, a solid-contact Ag +-selective electrode (Ag +-ISE) is fabricated and used to monitor the dissolution of Ag NPs. Ordered mesoporous carbon is compared with disordered mesoporous carbon as the solid-contact material for the Ag +-ISE. The ordered mesoporous carbon based solid-contact Ag +-ISE shows a linear potential response in the range of 1.0 × 10 −6-1.0 × 10 −3 M AgNO 3 with the slope of 55.6 ± 0.8 mV/dec (n = 7) and the detection limit of 10 −6.8 M. The solid-contact Ag +-ISE is used to monitor the concentration changes of Ag + during spontaneous dissolution of Ag NPs in deionized water, and the dissolution kinetics of Ag NPs is consistent with that obtained by inductively coupled plasma-mass spectrometry (ICP-MS). Stimulated dissolution of Ag NPs induced by addition of H 2O 2 to the Ag NP solution is also investigated by the proposed solid-contact Ag +-ISE. This work provides a fast tool for charactering the dissolution of Ag NPs to Ag + in real time, which is important for studying the toxicology of nanoparticles.

Original languageEnglish
Pages (from-to)50-57
JournalAnalytica Chimica Acta
Volume1101
DOIs
Publication statusPublished - 8 Mar 2020
MoE publication typeA1 Journal article-refereed

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