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Low-resolution mass spectrometric relative response factors (RRFs) and relative retention times (RRTs) on two common gas chromatographic stationary phases for 87 polychlorinated dibenzofurans.
Umeå University, Faculty of Science and Technology, Chemistry. Faculty of Social Sciences, Educational Measurement. Miljökemi.
Umeå University, Faculty of Science and Technology, Chemistry. Miljökemi.
Umeå University, Faculty of Science and Technology, Chemistry. Miljökemi.
2004 (English)In: Chemosphere, ISSN 0045-6535, Vol. 55, no 7, 983-95 p.Article in journal (Refereed) Published
Abstract [en]

All 87 tetra- to octa-chlorinated dibenzofurans (PCDFs) were analysed using high-resolution gas chromatography/low-resolution mass spectrometry (HRGC–LRMS). The mass spectrometer was operated in two different modes: electron ionisation (EI), and negative ion chemical ionisation (NCI) with methane as a reagent gas. Baseline separation and identification of all PCDF congeners was carried out using one non-polar (DB-5) and one polar (RT-2330) capillary GC column. Relative retention times (RRTs) on both columns, and relative response factors (RRFs) in both EI- and NCI-modes, were calculated for all 87 of the PCDFs. Comparison of the EI-RRFs and NCI-RRFs showed that the mass spectrometric NCI-responses varied to a higher degree than the EI-responses. The level of NCI-response was dependent on the substitution positions of the chlorine atoms on the dibenzofuran molecule skeleton. The ratio between the highest and lowest RRFs was 26 in the NCI-mode, but only 2.3 in the EI-mode. Thus, quantification of tetra- to octa-CDFs in environmental samples using the NCI-mode will result in incorrect estimates of PCDF concentrations unless 13C-labelled internal standards are used for each congener, or RRFs are taken into consideration. In contrast, the quantification of PCDFs in the EI-mode using a single internal 13C-labelled PCDF standard for each PCDF homologue is accurate according to the findings in this investigation. A flue gas sample from a municipal solid waste incinerator (MSWI) analysed in the NCI-mode was quantified with and without NCI-RRFs. When using NCI-RRFs the reported concentration of ∑PCDFs in the flue gas sample increased by 40%. Furthermore, TCDF analysis was compared using two mass spectrometers (a VG 12-250 and a Finnigan 4500) operating in EI-mode. These quadrupole instruments performed equally well, giving similar EI-RRFs for the tested compounds.

Author Keywords: Polychlorinated dibenzofurans (PCDFs); Relative response factors (RRFs); Relative retention times (RRTs); Electron ionisation (EI); Negative chemical ionisation (NCI)

Place, publisher, year, edition, pages
2004. Vol. 55, no 7, 983-95 p.
Keyword [en]
Benzofurans/*analysis/*chemistry, Carbon Isotopes, Comparative Study, Mass Fragmentography/*methods, Methane, Time Factors
URN: urn:nbn:se:umu:diva-5736DOI: doi:10.1016/j.chemosphere.2004.01.017PubMedID: 15051368OAI: diva2:145404
Available from: 2007-05-23 Created: 2007-05-23 Last updated: 2011-01-12Bibliographically approved

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