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UVF Technology» |
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Sitelab's hand-held, battery operated TD-500 analyzer uses a black
light LED for detection, which is highly sensitive to PAHs, crude
oils, waste oils, lubricating oils and other TPH... |
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Not sure
what type of petroleum you have? Use our UVF-3100D
analyzer to identify the type and age of your site's
contamination... |
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UVF Technology
Limitations? |
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1. Fluorescence can not
detect one compound from another. It only detects groups of
hydrocarbons. |
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2.
Petroleum contaminants that contain straight chain aliphatic
hydrocarbons with no aromatic content at all, are not detectable.
This includes TCE, PCE and other
chlorinated solvents, |
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3. This is a field
screening tool. Depending on your application, confirmatory
analysis with a certified lab may be required. |
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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 for each compound.
Aromatic hydrocarbons, which include carcinogenic compounds like benzene,
naphthalene, benzo[a]pyrene, etc., both excite and emit energy at specific
wavelengths. The fluorometer's response of each sample is measured by
the instrument on a linear, 5-point calibration curve using certified
standards sensitive to the wavelengths of interest. Samples are
extracted in methanol solvent using disposable test kits and then placed
into the analyzer for analysis, where the concentration is displayed in only
a few seconds. |
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Portable, versatile and simple to
operate...
»Click
for schematic diagram of UV fluorescence spectroscopy
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. In addition, most
conventional laboratories use a variety of U.S. EPA test methods
using Gas Chromatography (GC) instrumentation to separately report
gasoline range, diesel range and other specific hydrocarbon groups.
Fortunately,
Sitelab provides a variety of different types of UVF 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 specially developed optical
filters, test results generated directly correlate, providing very
accurate and reliable results at only a fraction of the cost and time.
Sitelab's
calibration kits are specially formulated...
Sitelab's TPH, DRO and GRO calibration standards do contain aliphatic
compounds. These compounds are inert, they do not fluoresce.
However, they are accounted for in the calibration. As
such, samples contaminated with both aromatic
and aliphatic hydrocarbons, which is the case with most petroleum
products, will be accounted for when measured by
Sitelab's UVF-3100 and TD-500 instruments.
»See
case study with aliphatic + aromatic DRO analysis |
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Types of Aromatic Hydrocarbons... 
Minimum Detection Limits? 
Method Detection Limit... 
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