Chemical Interferences:
The chemical interferences arise out of the reaction among different interferents and the analyte. These are of various types. Some of these are given below.
Cation-anion interference
The presence of certain anions, like as oxalate, sulphate phosphate and aluminate, in a solution might affect the intensity of radiation emitted through an element, resulting within serious analytical error. For example, calcium inside the presence of phosphate ion forms a stable substance, as Ca3 (PO4)2 that does not decompose simply, resulting within the production of lesser atoms. Therefore, the calcium signal is depressed. Another same example is that of determination of barium in presence of sulphate creating insoluble BaSO4. This kind of interference could be removed either through extraction of the anion or by using calibration curves prepared from standard solutions containing similar concentrations of the anion as found in the sample.