Column Preconcentration Systems for Flame AA and ICP Emission Spectrometry

3 Column Preconcentration Systems for Flame AA and ICP Emission Spectrometry 

A specific feature of flame AA and ICP emission spectrometric detectors is that certain sample introduction rates are required to achieve optimum response (see Sec. 

In ICP spectrometry, optimum sample introduction rates are much lower than those for flame AAS. In a FI column preconcentration system the optimum conditions for elution are closer to the required sample introduction rates. Therefore, on-line elution flow-rates are quite similar to the normal sample introduction rates of 1-2 ml min for ICP spectrometric systems. 

5 Schemaiic figure ol a single-channel FI manifold for on-line preconceniraiion with flame AAS detection. S. sample injection valve E. eluent injection valve C. packed sorption column D. flame AAS detector W. waste CR. carrier 3.  

The manifold in Fig. 4.6 was modified by Xu et al. 8] by introducing small air segments at the sample/eluent interface to restrict mutual dispersion between the two zones (cf. Sec. 4.4.3). 

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