Features of methods based on hydride or cold mercury vapour generation

Features of methods based on hydride or cold mercury vapour generation 

Steady-state and kinetic methods of hydride and cold vapour generation 

When a preconcentration unit is placed behind the separator, the hydride-forming reaction usually develops to completion, which results in increased sensitivity — at the expense of throughput. 

Shortening the collection time is recommended when other hydride-forming elements present in the sample react more slowly than the analyte forming the volatile species. This fixed-time kinetic approach is less sensitive than its steady-state counterpart but provides better selectivity and shorter analysis times [32,33]. 

One salient advantage of fixed-time kinetic methods is significantly increased selectivity. Tolerated concentrations of interfering metal ions are often reported to be one to two orders of magnitude higher than in equilibrium methods. The increased tolerance to interferences of kinetic methods may be the result of the following facts  

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