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Up to now the analytical methods ASTM D1319 (Fluorescence Absorption) and ASTM D6379 (HPLC-Refractive Index Detection) were available for the quantification of the aromatic content in Jet Fuel. Since June 2019 the new method ASTM D8267 is available and now also added to the specification standard ASTM D1655.
This method consists of a gaschromatographic separation in combination with Vacuum-Ultraviolet-Detection at a wavelength range between 125 – 240 nm (Vacuum-UV) and provides an innovative analytical technique for different applications. Highy energy short-wave UV-light induces electron transitions in excited states σσ* or ππ* in almost all chemical bonds and provides the possibility to record characteristic spectra. By this approach it is possible to assign compounds to different chemical classes.
The principle of the detection is depicted in the following figure.
Associate Scientist
Representation kindly provided by VUV Analytics.
The VUV-Detector consists of a Deuterium lamp, Flowcell and Photo-Detector. Depending on the chemical bonding, absorption takes place at different wavelengths and by this produces characteristic spectra, which are used for an explicit assignment to chemical compound classes and quantification according to the Lambert-Beer law.
The quantification of mono- and diaromatic contents in Jet Fuel is only one application of this technique.
The absorption of saturates at 125 – 160 nm is displayed in red, the absorption of aromatic compounds at 170 – 200 nm is displayed in green. The assignment of mono- and diaromatic compounds is based on their characteristic absorption ranges. Specific response factors are applied and by this detected absorptions can be converted directly proportional into mass and volume percent, respectively.
GC-VUV can also be applied for a PIONA analysis (ASTM D8071) and VHA analysis (WK 64297: verified hydrocarbon analysis comparable to DHA). Furthermore, there will be an analysis method for diesel fuel in due course!
We offer gas chromatography according to ASTM D8267.
Details can be found in our info letter. Click here for download.
Test parameter | Method |
---|---|
Acid number | ASTM D3242 |
Aromatics | ASTM D8267 |
Sulfur, mercaptan | ASTM D3227 |
Sulfur, total | ASTM D2622 |
Density at 15°C | ASTM D4052 |
Flash point | ASTM D93 |
Freezing point | ASTM D5972 |
Viscosity at -20 °C | ASTM D7042 |
Net heat of combustion | ASTM D4809 |
Smoke point | ASTM D1322 |
Naphthalenes | ASTM D1840 |
Corrosion, copper strip (2h at 100 °C) | ASTM D130 |
Thermal stability | ASTM D3241 |
Existent gum | ASTM D381 |
Microseparometer, Rating | ASTM D3948 |
Electrical conductivity | ASTM D2624 |
Distillation | ASTM D2887 |
Additional parameter | Method |
---|---|
GCxGC-TOF MS | ASG 2253 |
GCxGC-FID | ASG 2502 |
Metals (Al, Ba, Ca, Cr, Co, Cu, | ASTM D 7111 |
Lubricity | ASTM D5001 |
Halogens | ASTM D5379 |
Hydrocarbon composition | ASTM D2425 |
Elemental analysis C-H-N | ASTM D5291 |
Nitrogen content | ASTM D4629 |
Water content | ASTM D6304 |
With the analysis by GC-VUV (ASTM D8267) or GCxGC (ASG 2253 or ASG 2502) further methods are available. Additional information can be found in the section "Special analytics" or on request.
ASG Analytik-Service AG
Trentiner Ring 30
86356 Neusäss
Germany
Tel.: +49 (0)821 450 423 0
Fax: +49 (0)821 450 423 17
info@asg-analytik.de