What to consider when selecting the HPLC / GC vial insert?

Limited-volume inserts are an economical solution when sample sizes are limited and auto sample feeders are used. Most autosamplers have a set depth, and the sample needle can enter the vial without hitting the bottom. Even if the available sample size is very small, the micro insert increases the depth of the sample in the sample vials.

 

1. Insert Shape and Point Style

The type of HPLC/GC sample vial insert selected depends on the amount of sample available and the amount of residue after sampling.

 

The conical glass insert has a tapered bottom with a pull tip and can be carried with or without plastic polypropylene springs. The spring acts as a shock absorber during needle insertion and raises the insert above the bottom of the vial to increase sample recovery.

Flat-bottomed glass inserts have the largest capacity and are the most economical. These blades are cylindrical and have a flat bottom.

 

2. Solvent compatibility

Type I borosilicate glass plug-ins are most commonly used for trace analysis in chromatography.

Polypropylene plug-ins are cheaper than glass and are suitable for applications involving pH-sensitive samples.

 

3. Size of the autosampler vial

Selecting an incorrect size autosampler sample vial insert can result in poor reproducibility between sample injections, damage to the autosampler needle, and inadequate sealing between the spacer and the sample bottle.

 

 

The blade dimensions listed in the article refer to the outer diameter and length. The 5mm insert is used in the sample vials for the standard mouth and the 6mm insert is used for the wide-mouthed sample vial. The length of the insert should be flush with the neck of the vial to prevent the insert from causing the cushion to swell.

 

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