In some instances it might be better to increase the amount of silica wool when analyzing samples with large latent heats of vaporization, such as aqueous solutions. Conversely, it may be better in some cases to reduce the amount filled if the sample is highly adsorbent.

In some instances it may be better not to fill silica wool when using splitless injection or direct wide-bore injection (prevents adsorption, decomposition).

Generally, when filling a tapered bottom insert with silica wool, the reproducibility is improved by filling the wool in a position that is right by the tip of the syringe needle. However, the reproducibility and recovery rate may be improved by filling the wool in the bottom of the tapered insert when analyzing highly adsorbent or high matrix samples.

When analyzing high boiling point compounds, lowering the silica wool position by about 10mm to 20mm can sometimes improve the recovery rate.

The use of deactivated silica wool and inserts is recommended in order to prevent adsorption and decomposition inside the sample injection port.

221-48600 Deactivated silica wool

Go to Glass Insert Deactivation (DMCS) Procedure