1. Weigh Sample
onto a digital scale and placed into a jar for extraction.
measured out and poured into a jar for
Oil on metal: wipe surface with gauze pad and add to jar
2. Add Solvent
Solvent is measured out with a test tube and then added to
the sample extraction jar. Jars are shaken by hand for several minutes,
giving the solvent ample time to dissolve/extract the
Use methanol for soils and sediments. Use hexane for
crude oil in water or oil on metal.
3. Filter Extract
A syringe is used to suck up the
extract, which is then passed through a specialized filter
to remove particulates and interferences.
Once the samples have been extracted in solvent, they can be
analyzed at any time. Extracts are reusable and can be
tested over and over again.
4. Dilute Extract
In order for the sample to be detected within the linear
range of the calibration curve, a dilution is usually
required for analysis. Dilutions are made using a high
precision pipette by diluting the extract into a second test
tube and adding more solvent.
5. Test Sample
poured into a glass cuvette and then placed into the analyzer
for analysis. After a few seconds, the sample's
concentration is displayed in
Final results are calculated by multiplying the
reading by the dilution factor.