Common spectral interference:

Another common spectral interference involves the formation of undesired species (e.g., ions, metal oxides). Some metals are extremely sensitive to small plasma fluctuations. This output within the changes in the relative amounts of neutral atom and the corresponding ions. You might note that the emission spectrum of an atom of a specific element (e.g., Fe) is quite different from that of its ions (e.g., Fe⁺, Fe⁺², etc.). Similarly, the formation of metal oxides or metal carbides, are also potential source of interference and need to be evaluated on an individual basis.

The background emission and stray light could usually be compensated for by subtracting the background emission determined by measurements adjacent to the analyte wavelength peak.