Abstract
A new sample introduction system for inductively coupled plasma emission spectrometry is described. With this system, sample carrying cups can be sequentially and automatically inserted into an ICP discharge using a pneumatically activated transport system. The system carousel holds up to 24 cups (graphite or metal) and is located below a modified plasma torch that accommodates pneumatic injection of the entire sample carrying cup. The torch-insertion subassembly allows height programming of the final insertion and hence steps such as drying and ashing can be performed in situ. The system is applicable to the analysis of small volumes of liquids (10 μl) and small amounts (10 mg) of powders. The analytical characteristics will be presented including signal temporal behavior, detection limits and precision. Preliminary results indicate that the direct quantitative analysis of powdered botanicals and coal is feasible.
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