Multivariate optimization of an axially-viewed inductively coupled plasma multichannel-based emission spectrometer for the analysis of environmental samples.
An experimental design procedure was applied to optimize the operating conditions of an axially-viewed inductively coupled plasma emission spectrometer instruments equipped with echelle optics with cross dispersion and charge transfer device. The multivariate effect of carrier gas flow rate and r.f. power on several analytical figures was investigated and discussed. Both ultrasonic and pneumatic nebulization were used. For the final choice of the optimum, different criteria were taken into account, mainly plasma robustness, instrumental precision, analyte and background net emission, detection limits and signal-to-background ratios. It was found that the use of moderate power (1100W) and mean carrier gas flow rate (0.75 L/min) allows to obtain sufficient plasma robustness, satisfactory precision, and excellent signal-to-background ratios and limits of detection, favorable for ultratrace element determinations in environmental matrices.
Grotti
Marco
M
Department of Chemistry and Industrial Chemistry, University of Genoa, Via Dodecaneso 31, 16146 Genoa, Italy. grotti@chimica.unige.it
Lagomarsino
Cristina
C
Soggia
Francesco
F
Frache
Roberto
R
D005618:Fresh Water / Q000032:analysis*; D016014:Linear Models; D015999:Multivariate Analysis; D012015:Reference Standards; D012680:Sensitivity and Specificity; D013054:Spectrophotometry, Atomic / Q000379:methods* / Q000592:standards