Reference
111
Reference
About this product
Measurement principle
As indicated in Fig. 121, oils have an absorption band in the vicinity of wavelengths 3.4
m to
3.5
m (2941 cm
-1
to 2857 cm
-1
) based the expansion and contraction of groups such as
(-CH
2
-) and (-CH
3
) that are particular to hydrocarbons.
This product calculates the concentration of oil content by measuring this infrared absorption.
Fig. 121 Infrared absorption spectrums of solvent S-316 and oil
The solvent S-316 that is used for extraction has the following characteristics.
Less absorption in the vicinity of wavelengths 3.4
m to 3.5
m (2941 cm
-1
to 2857 cm
-1
)
Does not blend with water
Large difference in specific gravity with water
Easily dissolves oil
These properties can be used to extract (dissolve) oil dispersed in water into solvent S-316
and then measure the concentration of the oil content of the sample water by means of the
changes in the amount of absorption of infrared light in the vicinity of wavelengths 3.4
m to
3.5
m of the extracted liquid.
