Pesticide Analyzer Reference - writeframeofmind.biz

Configuring the GC/MS System for Pesticide Analysis
• The BEST PTV Backflush upgrade option for injection volumes < 10 μL inverts the direction of the carrier gas flow in the PTV inlet to vent dirty
matrices and high boilers from the split line. This feature prevents these compounds from entering the analytical column, which significantly reduces
analysis time and extends the life of the column. This option includes a 2 m pre-column.
• For injection volumes greater than 10 μL, the Large Volume Backflush upgrade option allows you to enhance PTV injector performance. This option
enables the solvent venting phase to occur through the backflush system, which allows for a significantly higher recovery of volatiles and makes it possible
for you to increase the injected volume. This option can also be used to eliminate the high boiling part of the sample. Preventing large quantities of
solvent from entering the analytical column and reaching the detector makes large volume PTV easily amenable to mass spectrometers. This option
includes a 10 m pre-column.
The injection parameters for PTV are described in the following tables.
Thermo Scientific Pesticide Analyzer Reference 31