4631369713

GENEROWANIE WODORKÓW DLA OZNACZEŃ METALOIDÓW 1165

ABSTRACT

The paper presents perspectives of development and application of determina-tions of arsenie, antimony and selenium by the methods based on hydride genera-tion [1, 2, 4-17]. This technique employed in spectrometric methods: absoiption atomie spectrometry (AAS), atomie fluorescence (AFS), microwave (MIP) or ic-ductively excited plasma (ICP) with emission or mass detection has become a very important tool in determination of environmental samples [3, 18], The paper presents the possibilities of current analytical methods available with the use of this technique. First of all the detection limit can be decreased by in-situ preconcentra-tion of volatile hydrides on the celi walls [19-36]. The possibility of speciation determinations based on the differences in the kinetics of hydride generation by different species present in the sample is discussed [79]. Speciation analysis brings important information on the real toxicity of migration pathways of the element studied [37-78]. The need for this kind of information has stimulated development of new analytical Solutions allowing separation of species in the chromatographic system or capillary electrophoresis, with selective spectrometric methods ICPMS, AAS or AFS in combination with hydride generation used for detection [79-115]. The progress in the hydride generation technique is closely related with recent attempts at direct analyses of solid samples [120-123], without the need to convert them into liquids, which facilitates the analytical process and permits simultaneous or almost simultaneous determination of yarious elements [124—126],