Approximately 2 μL of unleaded petrol was
added to 4 mL glass vial. The vial was then filled with a volume of tap
water up to 2 mL, which contained 10% (w/v) of sodium chloride salt
and extracted under optimized conditions. Fig. 5 shows the chromatogram
obtained for the contaminated tap water sample by 0.1% (v/v) of
unleaded petrol using the HS-SPME–GC–FID.