Hydride-forming elements mutual interferences

Gas-phase Interferences. Virtually, all hydride forming elements interfere mutually. In some cases even very small concentrations of the interfering element cause severe signal depressions. The extent of the interference depends only on the concentration of the interfering element, not on the interferent-analyte ratio. After sufficient dilution of the sample solution these interferences do not appear. 

Chemical interferences in atomic absorption cells caused by the mutual interaction of the hydride-forming elements, are unlikely in various plasmas because of their high temperatures. However, in DCP severe interferences caused by other hydride-forming elements have been noted (Figure 137). 

Gas-phase interference effects have been noted due to the mutual interference from the presence of other hydride-forming elements. As above, the extent of the interference is only dependent on the concentration of the interferent and not on the analyte-to-in-terferent ratio. As atomization of the hydrides occurs by collisions with hydrogen radicals, a radical... 

The gas phase interferences are obviously limited to those species which can be transferred into the vapor phase under these conditions, i.e., the hydride-forming elements and mercury. And if tin(II) chloride is used for the determination of mercury, no other element is volatilized so that no such interferences can occur. The mumal interferences of hydride-forming elements, however, may be quite severe, particularly in batch systems [36]. FI systems have been shown one more time to be superior also in this case as these mutual interferences are one to two orders of magnitude less pronounced compared to batch systems [37]. They should therefore be no problem in the analysis of body fluids or tissues, even in the case of a severe intoxication. 

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