Accurate determination of sulfur in gasoline and related fuel samples using isotope dilution ICP-MS with direct sample injection and microwave-assisted digestion

Analytical and Bioanalytical Chemistry
Jens HeilmannKlaus G Heumann

Abstract

Inductively coupled plasma isotope-dilution mass spectrometry (ICP-IDMS) with direct injection of isotope-diluted samples into the plasma, using a direct injection high-efficiency nebulizer (DIHEN), was applied for accurate sulfur determinations in sulfur-free premium gasoline, gas oil, diesel fuel, and heating oil. For direct injection a micro-emulsion consisting of the corresponding organic sample and an aqueous 34S-enriched spike solution with additions of tetrahydronaphthalene and Triton X-100, was prepared. The ICP-MS parameters were optimized with respect to high sulfur ion intensities, low mass-bias values, and high precision of 32S/34S ratio measurements. For validation of the DIHEN-ICP-IDMS method two certified gas oil reference materials (BCR 107 and BCR 672) were analyzed. For comparison a wet-chemical ICP-IDMS method was applied with microwave-assisted digestion using decomposition of samples in a closed quartz vessel inserted into a normal microwave system. The results from both ICP-IDMS methods agree well with the certified values of the reference materials and also with each other for analyses of other samples. However, the standard deviation of DIHEN-ICP-IDMS was about a factor of two higher (5-6% RSD at concent...Continue Reading

References

May 30, 2002·Analytical Chemistry·Dmitry R BanduraScott D Tanner
Jun 14, 2003·Proceedings. Biological Sciences·Molly E CummingsMichael J Ryan

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Citations

Jul 30, 2005·Analytical and Bioanalytical Chemistry·Sergei F BoulygaKlaus G Heumann
Sep 22, 2007·Analytical and Bioanalytical Chemistry·Saroj K PandaWolfgang Schrader
Oct 11, 2011·Analytical and Bioanalytical Chemistry·Jörg BettmerKlaus G Heumann
Jul 22, 2005·Journal of Mass Spectrometry : JMS
Nov 5, 2014·Journal of Proteome Research·Karina Taciana SilvaMilton Hércules Guerra Andrade

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