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Kierunki badań i możliwości analityczne w technice generowania wodorków dla oznaczeń arsenu, antymonu i selenu

Niedzielski P.

Wiadomości Chemiczne

2003

[Z] 57, 11-12

1163--1180

The paper presents perspectives of development and application of determinations of arsenic, antimony and selenium by the methods based on hydride generation [1,2, 4-17]. This technique employed in spectrometric methods: absorption atomic spectrometry (AAS), atomic fluorescence (AFS), microwave (MIP) or inductively 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 preconcentration of volatile hydrides on the cell 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 many elements [124-126].

Absorpcyjna spektrometria atomowa z generowaniem wodorkówi zatężaniem in situ w kuwecie grafitowej

Niedzielski P., Siepak M., Siepak J.

Chemia i Inżynieria Ekologiczna

2002

Vol. 9, nr 10

1167--1175

Omówiono połączenie absorpcyjnej spektrometrii atomowej z generowaniem wodorków i zatężaniem in situ. Scharakteryzowano etapy i układ analityczny wykorzystywany w procesie generowania wodorków i zatężaniu analitu na wewnętrznych ściankach kuwety grafitowej. Ponadto przedstawiono parametry metody analitycznej dla oznaczeń wybranych pierwiastków.

Coupling of the method of atomic absorption spectrometry wiith hyddride generation and in-situ preconcentration of hydride in graphite tube was described. Analytical procedure and analytical system used in hydride generation and analyt concentration on inside walls of graphite tube was characterized. Further more, analytical method's parameters for chosen elements were described.