Facultade de Fisioterapia

Evaluation of an automated thermospray interface for coupling electrothermal atomization-atomic absorption spectrometry and liquid chromatography

Authors: Carlos Bendicho

Journal: Analytical Chemistry, 66: 4375-4381, 12/1994

DOI: https://doi.org/10.1021/ac00095a040


Abstract

An automated thermospray interface is used to couple an electrothermal atomizer and a liquid chromatograph for speciation studies. The thermospray interface allows the periodical deposition in real time of the eluent from the chromatographic column into a graphite tube equipped with a curve-shaped platform. The time required between consecutive measurements is drastically reduced since the chromatographic eluent is dried on impact onto the preheated platform at 150 degrees C. A total thermal program time of 40 s is feasible (15 s for the furnace cycle plus 25 s for cooling down). This thermal program time is shorter when compared to that used for conventional sample introduction in a graphite atomizer (eg., 85 s). Relative standard deviation values of about 6% are reached for an arsenate solution when integrated absorbance measurements are used. The applicability of the interface is shown for speciation of arsenate, arsenite, and dimethylarsinate using reverse-phase isochratic separations.

Evaluation of an Automated Thermospray Interface for Coupling Electrothermal Atomization Atomic Absorption Spectrometry and Liquid Chromatography. Available from: https://www.researchgate.net/publication/231171387_Evaluation_of_an_Automated_Thermospray_Interface_for_Coupling_Electrothermal_Atomization_Atomic_Absorption_Spectrometry_and_Liquid_Chromatography [accessed Sep 11, 2017].