Determination of Gold in e-Waste Dust Samples and Geological Matrices by ICP-MS after Extraction by an HClO4-HBr-HI-Aqua RegiaMixture

作者: Ladislav Strnad , Ondřej Šebek , Marie Fayadová , Jan Vrba

DOI: 10.1111/J.1751-908X.2015.00368.X

关键词:

摘要: 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 0.5–1 g, with subsequent precise accurate analysis ICP-MS without any other preconcentration or separation. Procedure-1 decomposed samples effectively necessity leaching HF was developed dust e-waste (electronic waste) processing; however, testing on geological reference materials showed very good results. The analyses replicate decompositions (n = 5) both procedures yielded precision (< 5% RSD) most materials. accuracy achieved better than ± 10%, exception NIST SRM 2782 data Procedure-1. Two unknown processing (P-1 VM-1) exhibited elevated concentrations (21.31–61.64 μg g−1) 10% (n = 5). proposed techniques are simple, sensitive sparing in use chemicals, designed a variety samples. No significant influences observed predicted spectral interferences mass 197Au. La presente etude decrit deux methodes (Procedure-1 et pour l'extraction directe de l'Au par melange d'acide inorganique (HClO4-HBr-HI- eau regale) partir d'une matrice d’echantillon complexe dans un recipient standard 200 °C impliquant portion masse 0,5-1 g puis l'analyse exacte sans autre phase pre-concentration ou La procedure-1 efficacement les echantillons la necessite d'un l'acide fluorhydrique ete developpe poussieres provenant du traitement des « e-dechets » (dechets electroniques); Cependant, essais sur materiaux geologiques montrent que cette procedure peut donner d'excellents resultats. Les replicats (n = 5) produites ont donne une tres bonne plupart reference. L'exactitude obtenue est meilleure l'exception donnees procedure-1. Deux inconnus poussiere transformation dechets electroniques elevees d'Au (21,31 61,64 µg g−1) avec 5). proposees sont simples, sensibles, evitent l'utilisation produits chimiques concus variete d’echantillons electroniques. Aucune influence importante n'a observee spectrales predites Au197

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