Solid
- Page ID
- 74973
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Selection of the most ideal analyte introduction method is critical. Other than having the device on hand and selecting the ideal atomic emission method to interface, state of matter plays a big role in determining which method can/will be used. Directly introducing a solid into an emission source without first dissolving it is desirable because there is no dilution of the sample with extraneous substances, no introduction of impurities, and (at least potentially) the entire sample matrix is nonselectively introduced. Some techniques to consider are direct insertion, electrothermal vaporization, and laser ablation.
- Electric current rapidly heats rod that contains the sample. Dependent on your sample (solid or aqueous), solvent and some matrix interferents can be removed in a drying (10 seconds, usually around 100 oC) and ashing (anywhere from 0-60 seconds, 300-600oC, and the temperature can be ramped) stage before the vaporization of the analyte (usually ~1 second, anywhere within the range of 1100-2400oC) occurs. The sample is then carried to an atomizer. This is not atomization!!!!!!!!!!!!
- Direct Insertion uses powder placed inside the flame, plasma, arc or spark atomizer (atomizer acts as vaporizer). Again, the sample is carried to the atomizer by a gas.
- Ablation uses the coating of electrodes in a discharge cell and sample is entrained in Ar or He gas. Laser ablation uses a laser to vaporize sample.