Determination of the Optimum NiS Fire Assay Parameters for Pt, Pd, and Rh in Automotive Exhaust Catalytic Converters

Mehmet Hakan Morcali*, Suleyman Akman, Onuralp Yucel

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)


This work investigates the performance of the nickel sulfide fire assay (NiS-FA) for the pyrometallurgical analysis of platinum group elements (PGEs) from mixtures of automotive exhaust catalytic converters (e.g., gasoline, diesel, and diesel particular filter) by assessing the effects of various flux materials and reaction parameters on platinum, palladium, and rhodium recovery. Inductively coupled plasma mass spectrometry and atomic absorption spectroscopy (AAS) are used for the analysis of the NiS-FA beads. We found that the optimum recovery (at least 99.0%) was achieved with reaction of 11.5 g of flux (0.53 w/w ratio, sodium tetraborate:sodium carbonate), 1 g nickel, and 0.84 g sulfur (1.2 w/w ratio, Ni:S) per gram of sample for 90 min at 975°C. Reference standards (NIST SRM 2557) were used to compare efficiencies and identify the optimum conditions. The results are consistent with certified values and PGEs could be recovered within the 95% confidence level. The precision (<4.0% RSD) of all measurements, expressed as percentage relative standard deviation (SD), ranged up to 3.0%.

Original languageEnglish
Pages (from-to)1145-1154
Number of pages10
JournalChemical Engineering Communications
Issue number9
Publication statusPublished - 2 Sept 2015

Bibliographical note

Publisher Copyright:
© 2015, Taylor & Francis Group, LLC.


The authors wish to thank TUBITAK for financial support under project 113Z499 and Istanbul Technical University for financial support under BAP project 37018.

FundersFunder number
British Association for Psychopharmacology37018
Istanbul Teknik Üniversitesi


    • Automotive exhaust catalytic converters
    • Extraction
    • Fire assay
    • Metallurgy
    • Nickel sulfide
    • Palladium
    • Platinum
    • Rhodium


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