Data for: DIRECT PRECISE DETERMINATION OF PD, PT AND RH IN SPENT AUTOMOBILE CATALYSTS SOLUTION BY HIGH-RESOLUTION CONTINUUM SOURCE GRAPHITE FURNACE ATOMIC ABSORPTION SPECTROMETRY

Published: 05-02-2020| Version 1 | DOI: 10.17632/8mxnnmh339.1
Contributors:
Vasilina Eskina,
Olga Dalnova,
Daria Filatova,
Yury Karpov,
Vasilisa Baranovskaya

Description

This work investigates the analytical possibilities of high-resolution continuum source graphite furnace atomic absorption spectrometry (HR CS GFAAS) for the direct determination of Pd, Pt and Rh (PGMs) in spent automobile catalysts. A novel approach for the microwave dissolution with the mixture of HCl and H2O2 (4:1) was developed for the further HR CS GFAAS. It was found that within 20 minutes at the temperature 210°C of the PGMs quantitatively and simultaneously transferred to solution. It did not show any matrix interferences in determining Pd and Rh, when using HR CS GFAAS for determining the PGMs. When determining Pt, the matrix effect can be expressly minimized by diluting the sample or applying a corrective model. Limits of quantification (μg L-1) by HR CS GFAAS achieved were 1 (Pd), 2 (Pt), and 0.5 (Rh). Correlation coefficients were 0.9973 (Pd), 0.9995 (Pt), and 0.9983 (Rh). The relative standards deviation for PGM determination by the developed procedure was not higher than 5 % in the concentration range 0.0005-0.5 % weight. Moreover, validation of the process of evaluation of metrological characteristics for the sample preparation method developed in this research, demonstrated that it is resistant to changes in the samples of spent automobile catalysts. The correctness of experimental results was assured by the optical emission with inductively coupled plasma method comparisons.

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