The Benzene in Air application is based on an Agilent Technologies Gas Chromatograph configured with a sampling unit that uses a sampling pump, a mass flow controller and a multi-positioning valve. The multi positioning valve allows sampling direct from e.g. a Tedlar bag or taking sample directly from open air. Up to 8 samples or standards can be automatically selected and analyzed.

Collect the samples in Tedlar bags and use the stream selection valve to select either standards, samples and/or multiple samples for an automated analysis. The system’s PTV injection port is modified to contain a sorbent tube as injection port liner which ensures a rapid adsorption and desorption of Benzene.

Alternatively collect the sample on a sorbent trap using a programmable sampling pump. The sorbent trap is placed in the PTV inlet and automatically purged prior to thermal desorption and subsequent analysis.

The gas sampling unit automates the process of sampling, adsorbing and desorbing. After benzene has eluted from the precolumn to the polar column, the remainder of the matrix is backflushed to vent. The Benzene in Air analysis requires 25 minutes.