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Surficial sampling and analysis is used to assess the existence and/or
extent of oil contamination on various surfaces, rather than in
soil, sediment or water.
Applications
include testing wipe samples for residual oils coated on
aluminum, steel or other metal parts after the manufacturing
process. This includes
ventilation ducts, fans, AC coils and other metal working
processes to see how well the surfaces are washed off.
Testing concrete surfaces for TPH or PCBs is another such
application. In the food
and medical industries, testing metal parts or other components
for residual oils can also be performed for quality control, to
ensure the parts are clean and oil free prior to use.
Sample points should be carefully chosen and should be based on site
history, manufacturing processes, personal practices, obvious
contamination, migration pathways
and available surface area.
Once the sample location has been determined, it is
important to know the surface area in order to calculate the
final results.
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How it
Works...
A sample is collected by wiping off a surface using a gauze pad and
then extracting the pad in solvent.
The sample extract is then measured on the UVF analyzer,
which is
calibrated using the oil of interest.
A blank should always be collected and tested in order to
ensure the quality of the data.
The blank is used to set the detection limit and helps
identify background interferences caused by the gauze pad, gloves,
solvent and other materials used. For quality control, the sampling area can be wiped
again and retested to check for residual contamination.
For
maximum performance, be sure the calibration standards made from the oil
are
prepared properly. Alternatively, you can ship your oil sample
to Sitelab Corporation and we'll prepare certified calibration
standards specific for your project. |
Performance testing Cutting
Oils on Metal
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»Click
here to see how results are calculated |
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TPH Wipe Sampling
Procedure is Fast and Easy: |
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Measure Surface Area |
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Wipe Sample with Pad |
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Extract with Solvent |
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Test your Extract |
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Calculate Results |
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Calibration is Key! |
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Use a ruler and
tape to measure a 100x100 mm square area on your metal, concrete or
other surface area to be tested. Sitelab's TPH wipe sample
test kits are also available. |
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Wearing
protective gloves, wet the gauze pad with hexane solvent and wipe the
surface clean. Turn the pad over, unfold or add more
solvent if needed. Place the pad into a sample jar when
finished. |
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Using a test
tube, measure out 20 mL of solvent from the solvent dispenser bottle
and add to the jar containing the pad and then shake the jar for
several minutes. Be sure the pad is submerged in solvent. |
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Pour the sample
extract into the glass cuvette and place into the UVF instrument for
analysis. Record the concentration. If the readings are
too high, prepare and test a dilution using the extract if
necessary. |
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Sample results are then adjusted using surface dimensions in order to report concentrations in mg/sq-meter.
Contact Sitelab to see which analyzer is most suitable for your
application. |
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Cutting oils
(above) fluoresce differently from one another. Be sure to use
the proper instrument. Calibrate using the oil for accurate
measurement. If oil is not available, use Sitelab's
TPH-Oil calibration kit. |
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»Email
Sitelab for Wipe Sampling Products & Procedures |
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Testing Medical
Implant Parts for Oil Residue:
A
manufacturer in the medical industry coats it's stainless steel parts with
lubricating oil after the manufacturing process to prevent the parts
from corroding. The parts must be free of oil prior to use.
Sitelab helped the client develop a quick and reliable test method,
using the TD-500 for quality control purposes, by testing parts rinsed in solvent.
Many samples of different oils were sent to Sitelab to see which
oils fluoresced the most and which ones produced the lowest
detection limits.
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Applications
for Air & Oxygen Pump Devices:
A customer was required to test small components imported from a
foreign manufacturer for potential oil residues. The parts are
used to make oxygen pumps for hospitals for patients having
respiratory problems. Naturally, the parts must be free of any
oil prior to use. The type of oil was unknown and not
available. As such, Sitelab tested the samples using both the
UVF-3100 and TD-500 analyzers calibrated to it's TPH-Oil Calibration
Kit as a substitute. The TD-500 detected no hydrocarbons, but
the UVF-3100 did, illustrating the importance of choosing the right
instrument for these types of applications.
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