Journal Highlight: Determination of gold in e-waste dust samples and geological matrices by ICP-MS after extraction by an HClO4-HBr-HI-aqua regia mixture

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  • Published: Jul 4, 2016
  • Author: spectroscopyNOW
  • Channels: Atomic
thumbnail image: Journal Highlight: Determination of gold in e-waste dust samples and geological matrices by ICP-MS after extraction by an HClO<sub>4</sub>-HBr-HI-aqua regia mixture
Two methods are described for the direct extraction of gold Au by an inorganic acid mixture (HClO4-HBr-HI-aqua regia) from complex sample matrices for analysis by ICPMS.

Determination of gold in e-waste dust samples and geological matrices by ICP-MS after extraction by an HClO4-HBr-HI-aqua regia mixture

Geostandards and Geoanalytical Research, 2016, 40, 257-266
Ladislav Strnad, Ondřej Šebek, Marie Fayadová and Jan Vrba

Abstract: This study describes two methods (Procedures-1 and -2) for the direct extraction of Au by an inorganic acid mixture (HClO4-HBr-HI-aqua regia) from complex sample matrices. Standard PTFE jars at 200 °C were used to decompose test portions of 0.5–1 g, with subsequent precise and accurate analysis by ICP-MS without any other preconcentration or separation. Procedure-1 decomposed samples effectively without the necessity of leaching with HF and was developed for dust samples from e-waste (electronic waste) processing; however, testing on geological reference materials showed very good results. The analyses of replicate decompositions (n = 5) from both procedures yielded very good precision (< 5% RSD) for most of the reference materials. The accuracy achieved was better than ± 10%, with the exception of NIST SRM 2782 data from Procedure-1. Two unknown samples of dust from e-waste processing (P-1 and VM-1) exhibited elevated concentrations of Au (21.31–61.64 μg g−1) with precision better than 10% (n = 5). The proposed techniques are simple, sensitive and sparing in the use of chemicals, and are designed for a variety of e-waste dust samples. No significant influences were observed for the predicted spectral interferences on mass 197Au.

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