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Sitelab's portable field analyzers use ultraviolet fluorescence technology; a very selective detection method useful for measuring many types of petroleum contaminants.  UVF spectrometry's principle of operation relies on the electronic configuration of the molecular structure of organic compounds.  Aromatic hydrocarbons, which include ring-shaped compounds such as benzene, naphthalene and many others, both excite and emit energy at specific wavelengths.  The fluorometer's response of each sample is measured by the instrument on a linear, multi-point calibration curve using certified standards sensitive to the wavelengths of interest.  Samples are extracted and analyzed in solvent using disposable test kits.  The concentration is displayed in only a few seconds.
    

 


Different petroleum products contain different types and quantities of aromatic hydrocarbons, which fluoresce differently from one another.  Many contaminated sites also contain weathered fuel products which have degraded and changed in composition over time.  Conventional laboratories use a variety of U.S. EPA or other state regulatory test methods using Gas Chromatography (GC) instrumentation.  GCs can separate "TPH" into gasoline range, diesel and oil range hydrocarbon fractions.  The UVF-TRILOGY is designed to mimic these methods using different UV modules available.

                       
   
Sitelab provides a variety of different calibration kits to choose from in order to best match the source of your spill and provide maximum performance when comparing your field results to the confirmatory lab.  Since our analyzers are calibrated using similar types of certified standards laboratories use for GC analysis and are fitted with high precision excitation and emission optics, test results generated directly correlate, providing very accurate and reliable results.

 
 
How do Sitelab Results Correlate
to Certified Laboratory Test Methods?

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Sitelab's GRO, EDRO and TPH-OIL calibration kits are specially formulated products which contain both aromatic and aliphatic hydrocarbons.  Samples contaminated with gasoline, jet fuel and many other types of petroleum contain mixtures of both aromatic and aliphatics.  The aliphatic compounds are inert; they do not fluoresce, but are accounted for when calibrating Sitelab's instruments.    
                   SEE CALIBRATION KITS AVAILABLE
   



Due to UVF's high sensitivity, minimum detection limits are in the low ppm or ppb range, capable of meeting or exceeding most regulatory clean up levels.

Detection limits vary depending on which analyzer and calibration kit is used.  Detection limits are dictated by the lowest calibrator included with each calibration kit and are the same for soil, sediment or water samples.  A solvent blank is used to 'zero' the instrument during the calibration process.  Sample readings between zero and the lowest calibrator are reported as non-detect (ND).

Learn more about Fluorescence... 

           

 
     Gasoline
     Jet Fuels
     Kerosene
     Diesel Fuel
     Heating Oils, No 2. Fuel Oil
     Heavy Fuel Oils, No. 6 Fuel Oil
     Motor Oils & Lubricating Oils
     Waste Oils
     Cutting Oils
     Transformer Oil
     Hydraulic Fluid
     Gas Condensates
     Drilling Muds
     Crude Oils
     Bitumen, Tar Sands, Asphalt
     Creosote, Coal Tars, Coal Ash
 

What Doesn't Fluoresce? 

Fluorescence is not sensitive to straight-chain, aliphatic hydrocarbons.  UVF cannot detect contaminants such as TCE, PCE or other chlorinated solvents.  This includes methanol or hexane solvents used for analysis.  


New UVF-TRILOGY analyzer





 

 

 

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