WHEATON 0.1 ml PLASTIC AUTOSAMPLER VIALS With Glass Inner Cone Precision molded plastic vials with borosilicate glass inner cones •
A combination of advantages from a combination of materials
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Precision molded thermoplastic provides excellent dimensional tolerances for positive sealing and instrumentation use
ever, the advantage of CSE is that relatively large LC volumes (1-10 mL) can be directly transferred into GC columns equipped with only short RGs (1-5 m); no liquid actually enters the GC column. LC/GC interface designs An interface can be defined as a surface forming a common boundary between two regions and a place, or piece of equipment, where interaction occurs between two systems (9). All the LC/ GC interfaces described in the literature can be classified into three main categories: the autoinjector, eluent-
The borosilicate glass inner cone preserves the chemical integrity of the sample I Fits all standard autosamplers For more information call tollfree 1-800/225-1437 or write: Figure 4(a). Autoinjector interface.
WHEATON Manufacturers Since 1888 1000 N. Tenth Street Millville, NJ 08332, U.S.A. Call Toll-Free: 1-800/225-1437 Ext. 2768 Figure 4(b). Eluent-feed interface. CIRCLE 175 ON READER SERVICE CARD 688 A · ANALYTICAL CHEMISTRY, VOL, 60, NO. 1 1 , JUNE
1, 1988
feed (or on-column), and gas-transfer (or loop-type) interfaces. Autoinjector interface. The first commercially available LC/GC interface was introduced at the 1979 Pittsburgh Conference as a GC autosampler injector that had been modified with a flow-through side-arm syringe (10,11). The interface was positioned between a conventional 4-mm i.d. LC column and a capillary-column (or packed-column) GC. Figure 4(a) shows how the interface was adapted to on-line LC/GC. With this arrangement, LC eluent flows through the autosampler syringe to waste until a selected volume (0.1-
