Physical Interferences:

These interferences are associated with the processes of sample nebulisation and transport. The differences in the physical properties of the sample and calibration solutions lead to variations in the aerosol droplet size. This may influence the efficiency of the nebuliser and the sample introduction. The changes in viscosity and surface tension of the solutions can also cause significant inaccuracies. These become especially important in samples containing high amounts of dissolved solids or high acid concentrations.  The physical interferences can be reduced by diluting the sample. The use of an internal standard also proves to be useful.