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Issue 8, 2018
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Sample preparation strategies for petroleum coke digestion and further cerium and lanthanum determination by DSN-ICP-OES

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Abstract

The determination of cerium and lanthanum in petroleum coke samples by inductively coupled plasma optical emission spectrometry coupled to a desolvating nebulizer system (DSN-ICP-OES) is proposed for the first time after studying the following sample preparation methods: microwave-assisted digestion (MW-AD) in medium and high pressure systems and microwave-induced combustion (MIC). MW-AD in a medium pressure system was not suitable for digestion of petroleum coke even when using a low sample mass (up to 100 mg). Both MIC and MW-AD in a high pressure system were considered suitable for petroleum coke digestion, but MIC was preferable in view of the possibility of using diluted acid (2.5 mol L−1 HNO3) to digest 400 mg of sample and obtaining lower residual carbon content (RCC) values (below 0.1% instead of approximately 25% for MW-AD). The use of MW-AD required a dilution step (with a factor of four) to minimize the interference in analyte determination by DSN-ICP-OES. Accuracy was evaluated by comparing the results with those obtained by neutron activation analysis (an agreement of more than 94% was obtained) and also analyzing spiked samples (recoveries in the range of 88 to 102% were achieved).

Graphical abstract: Sample preparation strategies for petroleum coke digestion and further cerium and lanthanum determination by DSN-ICP-OES

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Publication details

The article was received on 07 Jun 2018, accepted on 29 Jun 2018 and first published on 19 Jul 2018


Article type: Technical Note
DOI: 10.1039/C8JA00192H
Citation: J. Anal. At. Spectrom., 2018,33, 1284-1291
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    Sample preparation strategies for petroleum coke digestion and further cerium and lanthanum determination by DSN-ICP-OES

    J. P. Souza, K. Kellermann, M. S. Camargo, D. P. Moraes, D. Pozebon and J. S. F. Pereira, J. Anal. At. Spectrom., 2018, 33, 1284
    DOI: 10.1039/C8JA00192H

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