Monitoring ion contamination is extremely important in the Semiconductor and Power Industries. By monitoring and controlling ionic contamination corrosion can be managed, and reduced.
Preconcentration
Pre-concentration is used to achieve sub-µg/L measurements. The pre-concentration process involves pumping the sample through an ion exchange concentrator column which retains anions or cations of interest while the sample matrix goes to waste.
Unique for Trace Analysis
The AS-HV is the only High Volume Autosampler that provides the option to either Push or Pull sample into a loop or concentrator. Depending on the level of ionic contamination, this option is key to obtaining the best detection limits for sub-PPB analysis.
Sample "Pushing"
The PUSH mode uses a pump to literally “push” sample through a loop or concentrator. In this case the pump is located between the autosampler and the injection valve. This is a very common loading technique and one that is used with all Dionex autosamplers.
Sample "Pulling"
In the PULL mode, the sampling pump is located down-stream from the loop or concentrator. The sample pump pulls sample through the sample loop or the concentrator and then to waste. The major benefit of this technique is that the sample does not see the pumping device until after it has been loaded onto the loop or concentrator. This is the best way to ensure that sample contamination is kept to a minimum and that materials associated with the pump (like seals and check-valves) do not interfere with the detection of low level analytes of interest.
