For petroleum hydrocarbon analysis QROS uses a technique called Ultra Violet Fluorescence Spectroscopy (UVF). This is carried out using our own exclusive in house designed and manufactured analyser called the QED.
The QED's built in software rapidly generates characteristic fingerprints that easily identifies the type of hydrocarbon contamination present in the sample. This is a similar feature to a GC trace, however in the case of GC traces significant experience and training are required to even tentatively identify the hydrocarbon type, and laboratories are generally reluctant to pass this information on to their clients. Accordingly using QED the operator is able to easily identify if the hydrocarbon is predominantly diesel, fuel oil, creosote, coal tar, pyrogenic material or lubricating oil, and even give some indication as to how weathered the contaminant is. This identification of the proper contaminant type means that the most appropriate calibration type can be used to generate the most accurate results. This feature is a significant improvement on standard laboratory practise which simply uses typical standard fuel hydrocarbon calibrants (BTEX, DRO and a mineral oil).
The QED generates a sample fingerprint with every analysis. The example on the left shows the sample fingerprint (black line) compared to the library fingerprint for Diesel (red line). As each hydrocarbon type has a characteristically shaped fingerprint, the user is able to compare the sample fingerprint against the QED library of fingerprints and identify the hydrocarbon type. By correctly identifying the hydrocarbon, the most appropriate calibration can be selected to generate the most accurate results. This feature is unique to QED. Other petroleum hydrocarbon analysers require a guess to be made about which hydrocarbon may be present in the sample and therefore frequently apply an inaccurate calibration. This feature means that the QED’s correlation to laboratory methods is excellent. Correct identification of the hydrocarbon type can also be invaluable when tracking hydrocarbon plumes from different sources. An indication of the weathering and degradation of fuel based hydrocarbon is also possible, which can be used to monitor the effectiveness of bio-remediation.
The QED has a unique “Background Subtraction” facility that can be used to remove the effect of naturally occurring organics or other compounds not of interest to the analysis. This can be very useful when working with soils or water containing a high concentration of organic matter. The QED analyser is the only on site Petroleum Hydrocarbon analyser available that can identify and quantify the petroleum hydrocarbon in a single analysis.
Hydrocarbon Analysis with
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