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Separation of solvent
Processing time can be reduced by separating solvent with a high oil concentration from
solvent a low oil concentration before reclamation.
Keep solvent, which has been used for calibration and measurement in containers separate
from unused solvent, and further separate by use and/or oil concentration. For example, it is
recommended that zero calibration liquid, span calibration liquid, low concentration sample
liquid, and high concentration sample liquid are reclaimed separately.
Checking the oil concentration of reclaimed solvent
After performing calibration using new solvent as calibration zero liquid, measure the oil
concentration of the reclaimed solvent on the product. If the difference between the oil
concentrations of the reclaimed solvent and the new solvent is 5 mg/L or less, the reclaimed
solvent can be used.
Storing solvent
Use a glass container to store the solvent. Do not keep it in a plastic container or metal
container.
If a plastic container is used, there is a risk that plastic components from the container will
dissolve into the solvent. If a metal container is used, rusting may occur due to the minute
water content of the solvent and the rust will mix into the solvent.
Mix together reclaimed solvent and store in one container.
The oil concentration of reclaimed solvent will vary with each reclamation process.
Accurate measurement will not be possible if solvent conditions are changed during the
course of measurement. If a large amount of solvent is necessary because you are
measuring a large number of samples or otherwise, mix reclaimed solvent together in one
large container to obtain the necessary amount of solvent with a uniform oil concentration.
Disposing of solvent
The solvent itself is a very safe chemical substance, however, dispose of solvent properly in
accordance with your local and national laws.