Analysis of a coal-derived liquid using highpressure liquid chromatography and synchronous fluorescence spectrometry

Synchronous fluorimetric characterization of heavy intermediates of coal direct liquefaction

“…Compared to conventional fluorescence at fixed monitoring wavelength, SFL shows much higher spectral resolution of the complex mixtures by selecting the difference of wavelength according to the sample structure [9]. Despite the limitation of the method that some molecules give only weak peaks, Katoh et al thought that it was the potential usefulness of SFL as a method of analysis of complex mixtures as coal-derived liquids [10]. Kister et al determined quantitatively the polyaromatic hydrocarbons (PAHs) in extractables of coal by SFL, in which three main synchronous fluorescence spectral regions were fined according to the number of lineally condensed aromatic rings [11].…”

“…Synchronous fluorescence spectrometry (SFL) introduced by Lloyd has been widely used to determine complex mixtures, and provides fingerprints of complex samples, such as crude oils and extracts of coals [7][8][9][10]. By SFL characterization, it was found that the thermolysis products of hard coal consist of the aromatic compounds with 2-5 condensed aromatic rings [8].…”

“…Assignment of synchronous fluorescence spectral peaks of conventional aromatic compounds: Ã -data determined in present work, Dk = 17; data taken from Ref [10],. Synchronous fluorescence spectra of THF solvent and several aromatic hydrocarbons (wavelength difference 17 nm, concentration 5 mg/L in THF solvent).…”

Applications of phasors to in vitro time-resolved fluorescence measurements

“…In recent years the use of fluorescence in analytical applications has grown in importance and is commonly used to detect and characterize sample heterogeneity in many chemical, physical and biological systems. Examples of such applications in chemistry include analysis of dissolved organic matter (such as polycyclic aromatic hydrocarbons) in air particulates [1,2], in human hair [3], in oil and water sample [4], in foods [5] and in coal-derived extracts [6]. Fluorescence heterogeneity analysis has also been applied in studies of nanotechnology [7], surface chemistry [8] and bacteria identification [9], while in biological fields fluorescence heterogeneity analysis is important in many areas such as studies of intrinsic protein fluorescence [10,11], biological membranes [12,13], nucleic acids [14] and calcium gradients [15].…”

Application of Synchronous Fluorescence Spectrometry in Separation of Aromatics from Hydrotreated Naphthenic Oil

“…Synchronous fluorescence spectra of some model aromatic compounds are shown in Figure 2. Attachment of side chains and naphthene rings to aromatic rings shifted the excitation-emission bands to longer wavelengths, but the magnitude of shift was not large (McKay and Latham, 1972;Katoh et al, 1980). From Figure 2, it can be seen that the wavelength range corresponded to the aromatic ring numbers.…”