Temperature programmed static secondary ion mass spectrometric study of phosphate chemical modifiers in electrothermal atomizers

Abstract

Temperature programmed static secondary ion mass spectrometry is used to investigate surface chemical reactions of phosphate chemical modifiers used for the determination of Cd and Ag in electrothermal atomic absorption spectrometry. Cadmium-xyphosphorus reactions are initiated on the surface at dry cycle temperatures, with further stabilizing reactions occurring on the surface in the char cycle temperature range. This leads to a delay in the atomization of Cd to a higher appearance temperature. However, for the determination of Ag, addition of phosphate results in an attenuation in the atomic absorption spectrometric signal intensity with no change in appearance temperature. Similar Ag-xyphosphorus surface reactions are not observed.

Kinetics and mechanism of solid decompositions — From basic discoveries by atomic absorption spectrometry and quadrupole mass spectroscopy to thorough thermogravimetric analysis

“…The appearance of PbO molecules in the thermal decomposition of lead nitrate was first reported by Sturgeon et al [8] and was subsequently confirmed by Bass and Holcombe [9]. Later, Holcombe and co-workers revealed the presence of NiO [10], CuO and Cu 2 O [11], CdO [12] and CrO and Cr 2 O 3 [13] molecules during the thermal decomposition of nickel, copper, cadmium and chromium nitrates. Ham and McAllister [14] detected CoO molecules during the thermal decomposition of cobalt nitrate.…”