Measurement
49
Checking procedure
1.
Dispense 8 mL of solvent and 16 mL of sample water into the glass container with a
lid.
2.
Screw the lid closed and shake for 1 minute by hand.
Fig. 50 Mixing solvent and sample water by shaking
3.
Place on a flat surface, and check if the mixture completely separates into two
layers after 20 seconds to 30 seconds.
Fig. 51 Checking layer separation
If a boundary surface has formed between the solvent layer and water layer, it can be
concluded that the layers "have been separated".
The following cases show that the layers have not been separated.
Separation into two layers takes more than 40 seconds
A whitish cloudy layer forms between the two layers
Bubbles with a diameter of greater than 10 mm get formed in multiple places throughout
the liquid and a boundary surface cannot be identified
