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Save time and
money on your next project using Sitelab’s portable
UVF-3100D analyzer.
In less than 10 minutes, samples are extracted in solvent
and then accurately measured for Target PAHs using Sitelab’s
PAH calibration kit.
Detection limits are as low as 50 ppb.
Test results will directly correlate to the sum of
PAHs reported by EPA Method 8270.
When the optics are rotated, samples can also be
tested for Total PAHs (or EPH aromatics), and the ratios or
“signatures” exhibited provide helpful forensic
fingerprinting data.
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Total PAHs:
EPH C11-C22 Aromatic
Hydrocarbons
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Target PAHs:
Using UVF-3100
Slot D Optics
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vs. Sum of PAHs: Confirmatory Lab
EPA 8270 GC/MS
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Power
Plant - Coal Ash/Clinker Site:
Sitelab is used to test PAHs for
monitoring the progress of a bioremediation
project performed by an environmental
engineering firm. The site is a former power plant
located at a U.S. Air Force Base in Goldsboro, North
Carolina.
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Manufactured Gas Plant – Coal Tar Site:
A contractor used Sitelab during a
site assessment testing river sediments contaminated from a
former manufactured gas
plant in Colorado. Like many MGP sites throughout the
country, this site contains a subsurface plume of DNAPL oil,
comprised of old coal tar, leftover from long ago.
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Petroleum Tank Farm - Fuel Oil Site:
A consultant
used Sitelab during a site investigation testing
soil borings for PAHs on a tank farm located along
Boston
Harbor in Massachusetts. The subsurface soils were
contaminated by a large commingled plume of diesel
fuel and No. 6 fuel oil.
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Go to the bottom
of this page to learn how the different EPH to PAH ratios shown above are
used for hydrocarbon fingerprinting |
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Need to Test
Benzo[a]Pyrene?
A contractor performing work at a former military shooting range, sent samples to Sitelab to perform PAH
analysis. The soils were contaminated with lead shot and clay
pigeons. Clay pigeon targets are made with limestone mixed
with petroleum asphalt pitch (often coal tar based), which contain high levels of Benzo[a]Pyrene
and other PAH compounds as a result of the combustion process.
Although
Sitelab's UVF instruments cannot separately detect PAH compounds directly,
response factors can be used to estimate and report Benzo[a]Pyrene
or other problematic compounds accurately. The samples tested during this pilot study were blind,
well homogenized split samples previously tested by a certified lab
using EPA Method 8270 by GC/MS.
Since
the Sitelab Target PAH concentrations were close to the laboratory's total PAH concentrations,
and the proportion of Benzo[a]Pyrene to the other PAHs was
consistent, as reported by the lab, using a response factor to
adjust the Sitelab results in order to estimate Benzo[a]Pyrene
generated accurate and reliable data.
Sitelab's results can
then be used on-site to help with soil removal, remediation
and investigation efforts.
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PAH and
TPH Applications using Sitelab's TD-500D to Monitor DNAPL Coal Tar:
Sitelab’s hand-held TD-500D analyzer is also a
cost-effective field tool for delineating MGP and other PAH contaminated
sites.
The analyzer is very sensitive to the heavy 4 and 5-ring PAH
compounds common in coal tars, creosotes and coal ash.
If the site contains a coal tar plume of DNAPL (dense non aqueous
phase liquids), the oil can be used to calibrate the analyzer, allowing
accurate TPH measurement. Results
correlate well to laboratory TPH GC methods. |
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»
Click here
for more applications
using Sitelab's TD-500D |
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PAH
Fingerprinting for Hydrocarbon Identification |
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This time saving feature allows you to test samples for both PAH fractions at
once, by rotating the optics on the UVF-3100D analyzer from Slot
D to Slot A and
re-analyzing the sample. The instrument does not need
to be recalibrated. The PAH standards respond the
same. But the ratios, or proportions, of a sample’s
Total PAH and Target PAH concentration will vary,
depending on how old and what type of petroleum
contamination exists.
Example:
Soil below a fuel oil tank once containing heating oil is
1,000 ppm EPH and 40 ppm Target PAH.
The drop in concentration is 25 times lower,
indicating the spill is not fresh, but fairly weathered and
degraded (see chart to right).
The Target PAH optics are
an integral part of Sitelab’s fluorescence fingerprinting
method for hydrocarbon identification. PAHs can also
be analyzed using Sitelab's TD-500 analyzer, which is
sensitive to the 4 and 5-ring compounds and will yield
different PAH results compared to the EPH and PAHs tested by
the UVF-3100D. As a fourth test, GRO analysis can also
be performed using the UVF-3100D for GRO, requiring a separate calibration for testing
the volatile C6-C10 BTEX fraction. In all, the fluorescence
signatures exhibited provides additional forensic screening
data useful for delineating sites having unknown petroleum
sources.
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»Click here for
UVF
Fingerprinting
Applications |
