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  Case Studies Available:

  UVF-3100 Applications

  TD-500D Applications



















    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 for organic compounds.
    Aromatic hydrocarbons, which include ring-shaped compounds such as benzene, naphthalene, benzo[a]pyrene 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 in solvent using disposable test kits and then placed into the analyzer for analysis.  The concentration is displayed in only a few seconds.

    Different petroleum products contain different types and amounts 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.

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.

This method is recognized by regulatory agencies as a field screening device.  The UVF-3100 was evaluated by U.S. EPA for TPH in soil measurement and ranked highest compared to six other manufacturer's devices.  Sitelab Corporation was certified by New Jersey DEP beginning in 2009.  It has been used on sites all over the world since 1998.


 See schematic diagram


How do Sitelab Results Correlate
to Certified Laboratory Test Methods?


    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 aliphatics compounds are inert; they do not fluoresce, but they are accounted for when calibrating Sitelab's instruments.    

    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).  See instrument specification sheets below for more details:

Instrument Specifications: 


     Jet Fuels
     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 used for analysis. 





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