Spectrometric and morphological characterization of condensed phase zirconium species produced during electrothermal heating on a graphite platform

Abstract

The characterization of condensed phase zirconium species on a graphite platform was accomplished over the temperature range 200–2500 °C using surface analysis techniques. This resulting information will be of relevance for mechanistic studies using zirconium as a chemical modifier.

Spectrometric study of condensed phase species of thorium- and palladium-based modifiers in a complex matrix for electrothermal atomic absorption spectrometry

“…The operation of the CTF-188 atomiser and calibration of the temperature settings with an optical pyrometer have been described previously. 16,[20][21][22] Standard uncoated rectangular graphite tubes, and standard pyrolytic graphite coated graphite platforms and standard uncoated non-pyrolytic graphite platforms were used for atomization. The platform was inserted into the tube via a slot along the side of the tube, below the sample injection hole (Fig.…”

“…Similar experiments were conducted using palladium as the modifier. Characterization of the condensedphase species followed similar methodology to that described elsewere, 16 and involved analysis by scanning electron microscopy (SEM), energy dispersive (ED) X-ray spectrometry, Raman microanalysis and attenuated total reflectance (ATR) Fourier transform-infrared (FT-IR) spectrometry. Electron probe techniques have proved to be very powerful tools for morphological visualization and chemical identification of solid micro-particles on the surface of graphite platforms.…”

Determination of some refractory elements and Pb by fluorination assisted electrothermal vaporization inductively coupled plasma mass spectrometry with platform and wall vaporization

“…The vaporization of sample into a hotter gaseous environment minimizes vapor phase interferences. Platform atomization generally assists in the reduction of background absorption through the increased dissociation of molecular species at higher gaseous phase temperature achieved in the furnace prior to analyte vaporization [1][2][3][4].…”

Síntesis y caracterización de nanopartículas cerámicas con propiedades fotoluminiscentes. Aplicación a la retención de arsénico

“…ZrO2 (Barberis et al 1997, Castro et al 2005. Este pico, en el caso de las nanopartículas de ZrO2 dopadas con arsénico, se transforma en una banda, debido probablemente a la superposición de diversas señales de flexión del grupo As-O-As (Verweij 1979).…”

“…En este caso, también podrían tener una pequeña contribución del enlace O-O propio de la estructura monoclínica del ZrO2 (Kumari et al 2009). Para las nanopartículas dopadas con 4000 μg As/mL, aparece un pico muy débil a 321 cm -1 , que se ha asignado a la vibración de torsión del grupo O-As-O (Goldberg, Johnston 2001), aunque también podría deberse a la vibración del ZrO2 en fase tetragonal (Barberis et al 1997, Castro et al 2005.…”