Determination of Silver and Gold Nanoparticle Using Single Particle -Inductively Coupled Plasma-Mass Spectrometry in Environmental Water

• 1、Center for Environment and Water Resourses, School of Chemistry and Chemical Engineering , Central South University,Changsha 410083
• 2、 Shenzhen Graduate School, Central South University, Shenzhen 518057, China

Abstract：A method of determination silver nanoparticle (AgNPs) and gold nanoparticles (AuNPs ) size distribution in dilute aqueous solution was established using single particle-ICPMS. An iterative algorithm of five time standard deviation was applied to distinguished silver or gold nanoparticle and baseline signal. The optimal dwell time was 3 ms to minimum possibility that two or more particles enter into detector. Size distribution of eight commercial AgNPs dispersions and AuNPs was determined using SP-ICPMS. The result of SP-ICPMS is accurately similar to TEM, indicating that SP-ICPMS is able to size silver and gold nanoparticles. The method of SP-ICPMS was also used to monitor AgNPs and AuNPs in natural and waste water, results indicated that SP-ICPMS method was simple, fast and high sensitivity, which could be used to detect AgNPs and AuNPs at low number concentration in aqueous environment.

Keywords： Analytical chemistry ICP-MS Gold nanoparticle Silver nanoparticle Environmental Water