Product

The Liquid Mode

Shimadzu's aim is to supply instruments that make chromatography sample processing simple and transparent. In line with today's laboratory equipment requirements for speed, flexibility and precision, we have enhanced the already proven reliability and productivity of our GC Headspace and Liquid Injection Systems. The AOC-5000 is designed to meet these requirements and it is the only GC sample injection system that combines liquid, large volume and headspace injection in one single instrument. This unique capability allows quick switching from one application to another on the same GC workstation. Whether your samples will be processed in headspace or liquid mode, or if your method requires split/splitless or on-column injection, your new instrument setup is ready in a few minutes. The AOC-5000 provides powerful working capabilities, an investment you can grow with.

In liquid injection mode, every single injection step, e.g. fill/inject speed, pre-and post injection delay times, pre-and post syringe cleaning, variable needle penetration depths, or standard addition, is individually controlled through the AOC-5000's advanced software package. LVI (Large Volume Injection) allows the injection of samples up to 500μL in a single stroke without the usual degradation in chromatographic performance. The capability to inject larger volumes eliminates the need to concentrate a sample through evaporation. This can translate into substantial time savings. For low-volume samples the fast injection speed minimizes needle discrimination and reduces background interferences, which means better results with less rework. The fast injection cycle time together with the nanoliter injection mode fits perfectly into the field of fast GC applications.

The Headspace Mode

With the syringe-only concept of the AOC-5000, a headspace technology has been introduced to eliminate the headaches commonly associated with conventional autosamplers. The robotic vial processing operation allows sample analysis in a straightforward and simple way. Sample vials are transported into the heated six-position incubator for preconditioning. After reaching the equilibration, a heated gastight syringe is moved over the incubator and the headspace sample is withdrawn. After sample injection the hot syringe is automatically cleaned by purging with inert gas. No complicated error prone operations, e.g. vial pressurization, valve switching, loop filling or heated transfer lines, are involved. For maximum throughput, the intelligently controlled vial transfer into the incubator oven ensures that a sample is always ready to be injected when the previous run is completed.

Besides the simple and transparent sample operation the AOC-5000 offers even more advantages over conventional headspace sampling:

• eliminates dead volume and adsorption effect in sample loops and transfer lines
• permits adjustable sample volumes without sample loop changes
• no sample dilution due to vial pressurization