Quantification of Middle Distillates



Two-dimensional gas chromatography

Comprehensive two-dimensional gaschromatography (GCxGC) provides an enormously enhanced selectivity compared to conventional gaschromatography. By the hyphenation of capillary columns of different polarity, it is possible to separate complex mixtures into single components.
The heart of the two-dimensional separation is the so-called modulator, which is located between the first and second column. The function of the modulator is to accumulate eluents of the first column, which are then refocused in small “packages” and afterwards “injected” into the second column for further separation.
Thermal modulation is achieved by alternating freezing and releasing of compounds by Cold- and Hot-Jets. Alternatively, the carrier gas flow can be regulated periodically (flow modulation). Structure and functionality are displayed schematically in following figure.

Structure of a GCxGC gas chromatograph



We offer the complete quantification of middle distillates using the following methods
ASG 2253 GC×GC-TOFMS and
Details can be found in our info letter. Click here for download.

Example of a 2D chromatogram

The following figure shows a representative two-dimensional chromatogram of common diesel fuel according to EN 590, as well as the results of the data evaluation and quantification. The separation was achieved by the application of a so-called “reversed-phase” column combination, consisting of a 50% phenylsubstituted column as 1st dimension and a 100% polydimethylsiloxane column as 2nd dimension.

2D Chromatogram Diesel EN 590

2D Chromatogram Diesel EN 590

Quantification diesel fuel EN 590

Quantification of aromatics in HVO and GtL by ASG 2901 GCxGC-FID

HVO and XtL fuels are characterized especially by their low content of aromatic compounds compared to conventional middle distillates. The application of GCxGC-FID is particularly suitable for the analysis of these small amount with a limit of detection of 0.05% (m/m).

High-temperature GCxGC-FID and -MS

Additional methods are available in form of high-temperature GCxGC-FID and -MS, respectively (ASG 2501 and 2221), and are applied especially for samples that strongly diverge from common middle distillates, e.g. by a high boiling range.

Analysis of aromatics in HVO and XtL

We offer analysis of aromatics in HVO and XtL using GCxGC-FID
Details can be found in our info letter. Click here for download.

ASG Analytik Service AG

ASG Analytik-Service AG
Trentiner Ring 30
86356 Neusäss

Tel.: +49 (0)821 450 423 0
Fax: +49 (0)821 450 423 17


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