Catalytic processes in graphite furnaces for electrothermal atomic absorption spectrometry

Atomic absorption spectrometric determination of the iridium content in tumor cells exposed to an iridium metallodrug

“…However, proper analysis of complex samples is often hampered by effects of the sample matrix. Besides optimisation of thermal sample pretreatment procedures the choice of appropriate additives plays an important role in ET-AAS method development [15,16]. …”

“…1), which may explain why the ascorbic acid modifier showed no beneficial effect for the iridium determinations. The effective background reduction by pyrolysis at 1400 • C expectedly also limited the influence of other modifiers such as palladium chloride and lanthanum nitrate, which act mainly by catalytic modes such as reduction of analyte oxides or interaction with the graphite surface [15,16].…”

Comparative efficiency of Pd, Rh and Ru modifiers in electrothermal atomic absorption spectrometry for the simultaneous determination of As, Se and In in a sodium sulfate matrix

“…Thus, we have to deal with poisoning of the modi®ers. 12,40,41 The probable mechanism of interference is competition between the analytes and sodium sulfate for the PGM modi®ers. The formation of Pd 4 Se from H 2 SeO 3 and prereduced palladium modi®er at about 200 ³C was observed experimentally by Lamoureux et al 42 According to thermodynamic calculations, the reduction of sodium sulfate in the presence of metallic Ru, Rh and Pd takes place at signi®cantly higher temperatures.…”

A screening method for the determination of toluene extractable organotins in water samples by electrothermal atomic absorption spectrometry and rhenium as chemical modifier

“…The role of refractory carbides as chemical modifiers appears to be the catalysis of the reduction of analyte oxides by the graphite atomizer. 37 Moreover, this is supported in that these compounds may promote the catalytic decomposition of organoelement compounds. 37 However, in the present study it was shown that W or Zr permanent modifiers were not as effective as the same modifiers added in solution.…”

“…37 Moreover, this is supported in that these compounds may promote the catalytic decomposition of organoelement compounds. 37 However, in the present study it was shown that W or Zr permanent modifiers were not as effective as the same modifiers added in solution. The reason for this difference could be the presence of oxygen in the latter case.…”