These procedures are based on detection via atomic absorption spectrometry (AAS), that is, either flame-AAS, electrothermally heated AAS (ET-AAS), or hydride generation-AAS. Special emphasis is placed on designing on-line preconcentration techniques in order to reach the very low limits of detection required in modern environmental analyses and to obtain sufficient selectivity via separation of the measurand from interfering matrix constituents. The preconcentration techniques comprize the use of incorporated column reactors containing ion-exchangers, exploitation of on-line generation of non-polar complexes which subsequently are selectively extracted, or the use of filterless precipitation/coprecipitation, where the preconcentration in the latter instance is effected by adsorption on the inner wall of a knotted reactor and where the precipitate ensuingly is eluted by a discrete zone of eluent. The research activities in this field is currently (1999/2000) being supplemented with the acquisition of an Inductively Coupled Plasma Mass Spectrometry (ICP-MS) instrument, which promises to entail even lower limits of detection and enhanced selectivity of measurement.
|Effective start/end date||01/01/1985 → …|