Troubleshooting
110
Note
Even when the same solvent is used for calibration and measurement, minute water content
effects may cause the indicated value to be negative. If needed, remove water from the solvent
layer referring to "Examples of measurement by extraction outside the product" (page 48), and
then perform measurement.
If ultrasonic treatment or filtration under reduced pressure is performed in measurement such as
that of residual oil content, the state of the solvent may change and cause the indicated value to
be negative. Calibrate using solvent given the same treatment.
If solvents of differing lots or repeatability are used for calibration and measurement, you can
measure the solvent to be used for measurement and subtract this value from the measured
value of the sample liquid to learn the concentration of the oil content of the sample.
(Concentration of oil content of sample) = (Measured value of sample liquid) - (Measured value of
solvent used for measurement)