Determination Of Silver In Nano-Plastic Food Packaging By Microwave Digestion Coupled With Inductively Coupled Plasma Atomic Emission Spectrometry Or Inductively Coupled Plasma Mass Spectrometry

摘要

The detection of silver in nano-plastic food packaging by microwave digestion coupled with either inductively coupled plasma atomic emission spectrometry (ICP-AES) or inductively coupled plasma mass spectrometry (ICP-MS) was investigated. Microwave digestion was optimised by trialling different acid mixtures. Both ICP-AES and ICP-MS showed good reproducibility, repeatability and recovery. For ICP-AES the limit of detection of the method (LOD_m) was 25.0ugg~(-1), the limit of detection of the instrument (LODi) was 30.0 ngml~(-1), the linear range was 0.10—10.0μgml~(-1). The average recoveries for blank samples spiked with silver at 100, 250 and 500μgg~(-1) ranged from 82.53% to 87.60%, and the relative standard deviations (RSDs) were from 1.79% to 8.30%. For ICP-MS analysis the LODm was 0.75 μgg~(-1), the LODi was 0.04ngml~(-1), the linear range was 0.20-500.0 ngml~(-1), the RSDs were 2.26-4.79%, and the recoveries were 78.09 92.72% (spiked concentrations of 2.5, 5.0 and 10.0μgg~(-1)). These results indicate that the proposed method could be employed to analyse silver in nano-plastic food packaging.