Figure 1.TOTAD interface with valves positioned both for LC separation and interface stabilization and for cleaning steps. Symbols: glass
wool (1), sorbent (Tenax TA) (2); needle valve (N); on-off valve (V); pressure regulator (PR); gas flow (nondotted arrows); liquid flow (dotted
arrows); TT stainless steel tubing to transfer from LC to GC; CT silica capillary tubing; ST stainless steel tubing to allow the exit of liquids and
gases; W waste).