The 7032A and 7032A-L Automated MiniCan Autosamplers

Gas phase volatile organic compounds are quantified by GC or GCMS using measured sample volumes ranging from several hundred milliliters to just a few microliters depending on the sample concentration.

Low cost sampling into small, inert fused silica lined canisters, called “MiniCans” allows sampled VOC’s to be brought to the stationary or mobile lab for analysis with acceptable holding times of up to several weeks.

Automated introduction of sample into a GC helps to make this technique more reproducible while maximizing the level of QA and data reliability.

7032A-L Loop Autosampler

The 7032A-L Autosampler automates the introduction of up to 21 samples into a gas chromatograph for quantitative analysis. Fixed volume loops are used to measure and equilibrate sample volumes to atmospheric pressure before injection to the GC. Small sampling containers, called MiniCans, are used to collect the sample in the field using the self contained vacuum to pull a 400cc volume into the fused silica lined interior. The inert inner surface permits sample stability for days or even weeks. Vacuum rated mini-quick connects allow initial vacuums to be maintained in the MiniCan for months before sampling, and allows “tool-free” sampling in the field. The vacuum driven sampling eliminates the need for pumps or electrical power.

Variable Volume Injections

The 7032A-L uses an electronic splitter to adjust the actual volume of sample delivered to a GC. Using a single loop, the volume can be split as much as 100:1 allowing a greater range of sample concentrations to be analyzed without dilution. Variable injection volumes also allow calibration curves to be generated from a single calibrated standard cylinder. Constant internal standards can be added independent of sample or analytical standard volumes.

Surrogate Spiking

The 7032A-L can perform automated pressurization of MiniCans before attachment to the 21 position inlet. Two modes support either a targeted final pressure or a dilution factor of 1.5x, 2x, or 3x. By attaching a cylinder containing a surrogate standard to the pressurizing gas inlet, a known amount of surrogate can easily be added to each MiniCan. Quantifying the amount of surrogate recovered provides verification of proper recovery of sample, a feature that is unique to the 7032A-L.

Large Volume Preconcentration

The 7032A-L is also available without a loop injection valve (Model 7032A) for operation with the 7100A Preconcentrator. Instead of being limited to a maximum of 5cc, the 7100A/7032A Preconcentration system allows recovery of 10-1000cc, depending on the initial pressure of the 400cc MiniCan. This greatly enhances detection limits allowing the analysis of compounds in the 1-1000 ppb range.

Focusing Option

Applications Industrial Hygiene Stack Landfill Gas Product Environmental Chambers Mobile Laboratories Petroleum/Petrochemical Emergency Response Programs Gas Offgasing Breath Analysis Indoor Air Soil Gas Remote Head Space Ordering Information Description Part Number 21 Position Loop Injection Auto sampler 7032A-L 21 Position Autosampler for Operation with 7100A 7032A Electronic Splitter 7032-01 Focusing Option 7032-02 MiniCan Heater 09-70100 Silonite™ Lined 400cc MiniCan Canisters 29-MC400L

Applications