| Autor: |
Manard BT; Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA., Bradley VC; Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA., Quarles CD Jr; Elemental Scientific, Inc., Omaha, NE 68122, USA., Hendriks L; TOFWERK AG, 3645 Thun, Switzerland., Dunlap DR; Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA., Hexel CR; Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA., Sullivan P; Elemental Scientific, Inc., Omaha, NE 68122, USA., Andrews HB; Radioisotope Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA. |
| Abstrakt: |
The work described herein assesses the ability to characterize gold nanoparticles (Au NPs) of 50 and 100 nm, as well as 60 nm silver shelled gold core nanospheres (Au/Ag NPs), for their mass, respective size, and isotopic composition in an automated and unattended fashion. Here, an innovative autosampler was employed to mix and transport the blanks, standards, and samples into a high-efficiency single particle (SP) introduction system for subsequent analysis by inductively coupled plasma-time of flight-mass spectrometry (ICP-TOF-MS). Optimized NP transport efficiency into the ICP-TOF-MS was determined to be >80%. This combination, SP-ICP-TOF-MS, allowed for high-throughput sample analysis. Specifically, 50 total samples (including blanks/standards) were analyzed over 8 h, to provide an accurate characterization of the NPs. This methodology was implemented over the course of 5 days to assess its long-term reproducibility. Impressively, the in-run and day-to-day variation of sample transport is assessed to be 3.54 and 9.52% relative standard deviation (%RSD), respectively. The determination of Au NP size and concentration was of <5% relative difference from the certified values over these time periods. Isotopic characterization of the 107 Ag/ 109 Ag particles ( n = 132,630) over the course of the measurements was determined to be 1.0788 ± 0.0030 with high accuracy (0.23% relative difference) when compared to the multi-collector-ICP-MS determination. |
