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What should a typical intensity peak look like?

Question asked by mdionne on Sep 20, 2019
Latest reply on Sep 23, 2019 by edgarvs

A bit of background information; analysis is for Au using typical fire assay methods to prepare the sample (so sample should be relatively free of interferences), as well as typical nitric/hydrochloric digestion. Calibration standards are certified Au only, 12.5% acid matrix.


Now to the question, what should a typical intensity peak look like? Sometimes I notice the peak is wide and round, sometimes the peak leans to the left or right, and sometimes the peak is narrow and pointed. Wavelength calibration has been done, torch is clean, lens is clean, and the same nebulizer flow/viewing position was used for each read. I've attached an example of what I've described. These are from a 5ppm Au standard.


Is a specific shape of intensity peak indicative of anything? Does it have any effect on the overall analysis?


I'd be very grateful for anyone's input!