Use of Internal Standard s with ICP-OES

An additional problem is that known elements in the periodic table, e.g. boron (B), tungsten (W) and molybdenum (Mo) tend to stick in the transport fine, nebuliser, spray chamber and torch causing memory effects in atomic spectroscopy. Elements that stick cause problems with quantification, and detection Emits and it is important that methods of reducing these are rigorously applied in analysis of these elements. However, memory effects in ICP-OES are not as pronounced as they are with graphite furnaces for refractory elements but they are present to some extent, and must be reduced or removed. 

Teible 7.4 Results of intensities for B, W and Mo metal measured against Sc internal standard. (Note There is excellent constant reading for the Sc internal standard) 

Volume H3PO4 Mannitol H3PO4 + mannitol No additive 

Effect of mannitol on Intensity Effect 0 H3TO4 and mannitol 

A similar list of samples was prepared for high viscosity lubricating oil (Conostan 75), as shown in Table 7.6. 

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