Analyse quantitative des hydrocarbures aromatiques polynucleaires par spectrofluorimetrie shpol'skii a 10 k: utilisation de la raie de mercure excitatrice diffusee par la matrice comme intensite lumineuse de reference

Abstract

( Quantitative analysis by Shpol'skii spectrofluorimetry of polynuclear aromatic hydrocarbons at 10 K with the mercury excitation line scattered by the matrix used as a standard intensity.) High-resolution Shpol'skii spectrometry in a matrix is particularly suitable for the determination of trace polynuclear aromatic hydrocarbons in complex mixtures. In the usual technique, the method of standard additions is backed up by internal calibration, which is tedious. A direct calibration technique is proposed in which the mercury excitation line, scattered by the polycrystalline matrix, serves as the standard intensity. Detection limits vary from 0.3 ng ml −1 for benzo(a)pyrene to 48 ng ml −1 for pyrene, with linear response over about 2 orders of magnitude. The dynamics and a statistical analysis of the confidence interval for the results are discussed.