Solid-phase fluorescence spectroscopy to characterize organic wastes

Combining chemical sequential extractions with 3D fluorescence spectroscopy to characterize sludge organic matter

“…2a) showed two peaks at about 350 nm emission wavelength when excited at 220 and 280 nm. These peaks are well known to be characteristic of protein-like compounds (Muller et al, 2011). This fluorescence fingerprint was reported as fresh organic matter which is rather easily biodegradable (Reynolds and Ahmad, 1997).…”

“…Moreover, we can distinguish a shoulder below this main peak at excitation wavelength around 400 nm. We previously identified the main peak as lipofuscin-like products while fluorescence induced at 400 nm was rather recognised as a lignocellulosic marker (Olmstead and Gray, 1997;Muller et al, 2011). This fluorescence fingerprint could match humic-like material as well.…”

“…It was also possible to measure the fluorescence fingerprint of the NE for this sludge. Indeed, Muller et al (2011) showed that the 3D fluorescence applied to dark coloured sludge does not work properly. By removing layers of the sludge during CSE, the non-extracted part of some sludge, like sludge A, was less dark coloured and could be then measured by solid phase fluorescence analysis.…”

Fluorescence Characteristic Spectra of Domestic Fuel Products through Laser Induced Fluorescence Detection

“…In the early age, the use of a LIF instrument alone or combined with other optical measurement tools were applied to direct monitoring of gaseous pollutants, such as CO 2 , NO, NO 2 , N 2 O 5 , SO 2 , aerosol particle and aromatic hydrocarbons (Bessler et al, 2003;Miyazaki et al, 2008; Suzuki et al Matsumoto et al, 2005;Matsumi et al, 2005;Taketani et al, 2013;Sirignano et al, 2012). The successful application of LIF spectroscopy has expanded to the detection of chemicals in water, soil organic matter, solid organic waste, crude oil and soil contaminants (Uebel et al, 1996;Martins et al, 2011;Muller et al, 2011;Hegazi et al, 2005;Lemke et al, 2005). Based on fluorescence properties of aromatic hydrocarbons, LIF is considered as a non-destructive and fast detection tool of PAHs even at very low concentrations.…”

Caracterização do carbono associado a horizontes espódicos profundos de solos da floresta amazônica, visando sua estabilidade

“…Matthews et al (1996) encontrou λ ex/em em 455 / 510 nm e denominou este pico com pico-L, relacionando-o com a presença da Lignina em ácidos húmicos terrestres. Muller et al (2011) sugeriu que os compostos do tipolignina deveriam ser os responsáveis pela emissão em 520 nm em matriz de resíduos sólidos orgânicos. A presença deste fluoróforo já foi anteriormente discutida (MCKNIGHT et al, 2001;STEDMON et al, 2003) P4 (cm) COT mg/L P5 (cm) COT mg/L 0-25 276,6 ± 1,27 0-15 283,2 ± 0,14 60-90 10,8 ± 1,62 60- 85 8,5 ± 1,02 185-195 16,8 ± 0,51 100-105 486,7 ± 28,14 210-230 16,5 ± 0,45 170-190 81,8 ± 2,83 250-280 58,2 ± 0,51 275-330 69,3 ± 0,12 450-490 106,6 ± 2,62 340-380 11,4 ± 0,82 Figura 29 -Foto do aspecto visual dos ácidos fúlvicos após purificado.…”