Indentification of carbon spectral-based interferences on prominent emission lines in vacuum ultraviolet region
| Authors | |
|---|---|
| Year of publication | 2005 |
| Type | Article in Proceedings |
| Conference | European winter conference on plasma spectrochemistry 2005 |
| MU Faculty or unit | |
| Citation | |
| Field | Analytic chemistry |
| Keywords | spectral interferences; VUV region; ICP-OES |
| Description | There are several important and unique analytical lines in region below 200 nm in inductively coupled plasma optical emission spectrometry. Carbon-based spectral interferences in this part of spectra can be observed in case of analysis of samples rich in carbon. These interferences are not sufficiently described and/or identified in many cases. In this work spectral interferents were observed with high-resolution monochromator in analysis of different samples with high carbon content and were identified experimentally. Structured background in the vicinity of analytical lines (I 178.280 nm, S 180.731 nm, I 183.038 nm, Sn 189.991 nm and As 197.262 nm) complicates determination of low concentrations of mentioned elements. The shape of interferents corresponds to the structure of molecular emission bands. The behaviour of interfering peaks was investigated with different conditions (forwarded power, gas flow rates, composition of gaseous mixture) and compared to that of well-known emission bands of carbon-containing molecules. Experiments resulted in identification of interferents as a structure of CO emission band. |
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