Figure 2.

Effects of sample pH on the IT-SPME of sulfated steroid metabolites. Standard solution (40 µL) containing 1 ng mL⁻¹ each of PREGS, DHEAS, and CRTS and 5 ng mL⁻¹ of E2S were extracted by 25 draw/eject cycles on a Supel-Q PLOT capillary at a flow rate of 200 µL min⁻¹.