1/1/2020· The sample was filtered into a 7 mL glass vial using a 3 mL syringe fitted with a GHP 0.2 µM disk filter. Aliquots of 0.5 mL sample were transferred into separate GC and LC vials. To the GC vials, 1 mL of dichloromethane was added, and to the LC vials 1 mL of ultrahigh purity water was added.