4.1 Preparation of Furan Stock Standard (ca. 2.50 mg/mL): By using a volumetric pipet, place 20.0 mL methanol in a headspace vial and seal the vial. Weigh the sealed vial (W1) to the nearest 0.1 mg.

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A standard, approximately the target levels, was prepared by injecting 11 uL of the acrolein and 12 uL of the formaldehyde stock standards onto a single coated XAD-2 adsorbent portion. 3.3.5 Prepare a sufficient number of standards to generate the calibration curves. Analytical standard concentrations should bracket sample concentrations.

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