with the technique also used for id

with the technique also used for identification of ignitable liquids from human skin [27]. The SPME method, compared with traditional LLE, limits loss of petroleum products during the sampling procedure since the process incorporates extraction, concentration and injection into a single step, which, in turn, makes it more time efficient. Additionally, the HS mode provides a lon- ger lifetime of the fiber and protects the fiber from any adverse effects that may occur due to non-volatile, high molecular weight substances in the real samples. This allows determination of petroleum products in low levels of concentrations with greater accuracy and precision.