Effect of the silicon chemical form on the emission intensity in inductively coupled plasma atomic emission spectrometry for xylene matrices

• DOI: 10.1039/b806594m
• Publication Date: 2009-03-24T16:45:41Z
• Authors: Raquel Sánchez; José-Luis Todolí; Charles-Philippe ...; Jean-Michel Mermet
• Keywords: Silanes; Hexamethyldisiloxane; Atomic emission spectroscopy; Siloxane

Silicon is present in petrol products under very different chemical forms. The effect of the silicon form on sensitivity was studied by inductively coupled plasma atomic emission spectrometry (ICP-AES). Solutions containing sixteen organic compounds with same concentration were prepared xylene. were: six siloxanes, nine silanes and a silicate. Their boiling points ranged from 101 °C (hexamethyldisiloxane) to 310 (2,3,4-(epoxycyclohexyl)ethyltrimetoxysilane). results indicated that ICP-AES signal depended strongly compound. Thus, for commonly used sample introduction system consisting cross-flow pneumatic nebulizer Ryton double pass spray chamber, varied factor up 17, depending For most cases, some siloxanes yielded higher intensities than silanes. In addition, circumstances, hexylmethyldichlorosilane dimethyldodecylchlorosilane also produced signals other order elucidate possible mechanisms these changes, series experiments performed verify whether origin could be assigned either or system. Using Mg II/Mg I ratio, no significant change characteristics actually observed. As regards system, (i) primary aerosol, (ii) transport memory effects using continuous discrete modes, an alternative total consumption (the TISIS system), (iii) tertiary via impactor, studied. Additional carried out ultrasonic nebulizer. Si behaviour compared elements, such as Cu, Mg, Mn Zn. not related suggested fraction transported towards vapour when it hexamethyldisiloxane (i.e., compound lowest point among species studied). any case, variability induced forms less cyclonic observed specific elements did significantly form. consequence, internal standardization appropriate mitigating interferences petroleum analyzed.