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Direct elemental analysis of diluted petroleum heavy fractions by means of inductively coupled plasma optical emission spectrometry equipped with a high temperature torch integrated sample introduction system

Abstract

The present work describes and discusses the use of the high temperature sample introduction system, hTISIS, for the analysis of crude oil and heavy petroleum fractions by means of inductively coupled plasma optical emission spectrometry, ICP-OES. A conventional Cyclonic spray chamber operated at room temperature has been used for comparison purposes. The method has been based on the sample gentle heating, dilution and introduction into the spectrometer. A 5 L solution volume has been injected into an air carrier stream and driven to the sample introduction system. Therefore, a transient signal has been obtained. Meanwhile, the quantification strategy has consisted in an external calibration using a single set of multielemental standards prepared in xylene. The achieved results indicate that, for crude oil and its heavy cuts, the hTISIS operated at 400 ⁰C provides signal enhancements in terms of peak height from about 4 to 15 times with respect to the Cyclonic spray chamber. Furthermore, the repeatability is improved and the limits of detection lowered when working with the high temperature device. For xylene solutions, the signal improvement factor coincides with that in terms of limits of detection. The measured LODs for real samples have also been determined and it has been observed that the Cyclonic spray chamber affords figures from 2.5 to 50 times higher than the hTISIS at 400 ⁰C. Moreover, for the latter design, matrix effects have been compensated for and it has been possible to apply the concept of universal calibration in which a single set of xylene multielemental standards has been applied to the simultaneous accurate quantification of silicon, vanadium, iron, aluminum and nickel in crude oil, atmospheric residue, fuel, vacuum residue and vacuum distillate.

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Publication details

The article was received on 01 Oct 2018, accepted on 26 Nov 2018 and first published on 27 Nov 2018


Article type: Paper
DOI: 10.1039/C8JA00320C
Citation: J. Anal. At. Spectrom., 2018, Accepted Manuscript
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    Direct elemental analysis of diluted petroleum heavy fractions by means of inductively coupled plasma optical emission spectrometry equipped with a high temperature torch integrated sample introduction system

    R. Sánchez, J. Lefevre and J. Todoli Torro, J. Anal. At. Spectrom., 2018, Accepted Manuscript , DOI: 10.1039/C8JA00320C

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