Abstract
After examining some materials for collecting oil from evidential material at the scene of a fire, we reported that oil clear film (face oil remover) was the most suitable.
Since oil clear film catches the oil but repels water, we can obtain the oil alone even from evidence that contains water.
Oil can be extracted from the film using a small amount of solvent and analyzed by GC.
This time I made some experiments on contemplating the film performance of oil adsorption.
Each film adsorbed with gasoline, kerosene and diesel oil was extracted at proper time intervals and analyzed with gas chromatograph.
In this way I measured the decrease of adsorbed oil.
The film is capable of detecting kerosene up to 1hour after adsorption and diesel oil up to 1 day after adsorption.
Gasoline is volatile and needs to be contained in the gas barrier plastic bag within 3 minutes after adsorption.
Oil clear film contains something similar to lubricant oil made from petroleum.
Thus, in case of collecting oils containing motor oil like a mixed gasoline, we should use oil clear films after degreasing by solvent.
