Appraisal of polycyclic aromatic hydrocarbons (PAHs) in environmental matrices by analytical pyrolysis (Py–GC/MS)

González‐Pérez, José Antonío; Almendros, G.; Rosa, José M. de la; González-Vila, F.J.

doi:10.1016/j.jaap.2014.07.005

Cited by 75 publications

(43 citation statements)

References 59 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…As it is shown by the PCA diagram, the detected aromatic compounds were mainly composed of alkyl benzenes (e.g., toluene, xylenes), polycyclic aromatic hydrocarbons (PAHs: indene, naphthalene, phenanthrene, anthracene and biphenyl), and (methyl-) phenols. Previous studies (e.g., González-Pérez et al, 2014) suggested that such compounds can be formed by incomplete combustion during wildfires and are indicative for the presence of charcoal. Accordingly, the PAHs were more abundant, as well as, more diverse in the EB and SF-EB samples than in the EU samples (Appendix A).…”

Section: Organic Matter Composition In Topsoil and Eroded Sedimentsmentioning

confidence: 97%

Molecular characterization of wildfire impacts on organic matter in eroded sediments and topsoil in Mediterranean eucalypt stands

Faria

Rosa

Knicker

et al. 2015

CATENA

Self Cite

View full text Add to dashboard Cite

Section: Organic Matter Composition In Topsoil and Eroded Sedimentsmentioning

confidence: 97%

Molecular characterization of wildfire impacts on organic matter in eroded sediments and topsoil in Mediterranean eucalypt stands

Faria

Rosa

Knicker

et al. 2015

CATENA

Self Cite

View full text Add to dashboard Cite

“…Polyaromatics: Polyaromatics comprised about 14 quantified pyrolysis products. The presence of four and five-ring polyaromatics (PA11, PA12, PA13, PA14; Table 1) was unequivocal evidence for burnt material [61]. Retene (PA13) is a breakdown product of terpenes from coniferous trees [67].…”

Section: General Distribution and Origin Of Pyrolysis Products In Thementioning

confidence: 99%

“…A total of 92 identified pyrolytic compounds are presented in Table 1. They were classified into nine groups according to their source and chemical characterization [18], representing a mixture of compounds from plant biopolymers (n-alkane, n-alkene, phenol and lignin) [20,60], microbial material (N compounds and polysaccharides) [19], and black carbon (aromatics, benzofurans and PAH) [61]. The PCA analysis revealed a pronounced difference in molecular composition for each fraction by the first two principal components, which explained 89.8% of the total variation ( Figure 3).…”

Section: General Distribution and Origin Of Pyrolysis Products In Thementioning

confidence: 99%

Different Molecular Characterization of Soil Particulate Fractions under N Deposition in a Subtropical Forest

Geng

Cheng

Han

et al. 2019

Forests

View full text Add to dashboard Cite

Key Findings: Combining physical fractionation and pyrolysis–gas chromatography/mass spectrometry (py-GC/MS) technique can help better understand the dynamics of soil organic matter (SOM). Background and Objectives: SOM plays a critical role in the global carbon (C) cycle. However, its complexity remains a challenge in characterizing chemical molecular composition within SOM and under nitrogen (N) deposition. Materials and Methods: Three particulate organic matter (POM) fractions within SOM and under N treatments were studied from perspectives of distributions, C contents and chemical signatures in a subtropical forest. N addition experiment was conducted with two inorganic N forms (NH4Cl and NaNO3) applied at three rates of 0, 40, 120 kg N ha−1 yr−1. Three particle-size fractions (>250 μm, 53–250 μm and <53 μm) were separated by a wet-sieving method. Py-GC/MS technique was used to differentiate between chemical composition. Results: A progressive proportion transfer of mineral-associated organic matter (MAOM) to fine POM under N treatment was found. Only C content in fine POM was sensitive to N addition. Principal component analyses (PCA) showed that the coarse POM had the largest plant-derived markers (lignins, phenols, long-chain n-alkanes, and n-alkenes). Short-chain n-alkanes and n-alkenes, benzofurans, aromatics and polycyclic aromatic hydrocarbons mainly from black carbon prevailed in the fine POM. N compounds and polysaccharides from microbial products dominated in the MAOM. Factor analysis revealed that the degradation extent of three fractions was largely distinct. The difference in chemical structure among three particulate fractions within SOM was larger than treatments between control and N addition. In terms of N treatment impact, the MAOM fraction had fewer benzofurans compounds and was enriched in polysaccharides, indicating comparatively weaker mineralization and stronger stabilization of these substances. Conclusions: Our findings highlight the importance of chemical structure in SOM pools and help to understand the influence of N deposition on SOM transformation.

show abstract

“…In recent years, pyrolysis GC‐MS has been proved to be a powerful method for characterizing the composition of complex compounds such as polymeric materials, natural organic matter, etc. 38–40. Another advantage of this method is that the samples can be retrieved without any change of the composition due to instantaneous evaporation 41.…”

Section: Introductionmentioning

confidence: 99%

Composition of the Green Oil in Hydrogenation of Acetylene over a Commercial Pd‐Ag/Al₂O₃ Catalyst

et al. 2016

View full text Add to dashboard Cite

Selective acetylene hydrogenation over a commercial Pd-Ag/Al 2 O 3 catalyst was carried out under industrial operation conditions that correspond to the ''tailend'' process. Pyrolysis gas chromatography-mass spectrometry was used to analyze the composition of the green oil. C8-C30 linear hydrocarbons with even carbon-numbered chains were detected as the main components of the green oil. Its chain length increased with operating time, temperature, and hydrogen partial pressure, and decreased with acetylene partial pressure. The composition of the green oil deviates from the Anderson-Schulz-Flory distribution. Both couplinghydrogenation and hydrogenation-coupling mechanisms are involved in green oil formation.

show abstract

Appraisal of polycyclic aromatic hydrocarbons (PAHs) in environmental matrices by analytical pyrolysis (Py–GC/MS)

Cited by 75 publications

References 59 publications

Molecular characterization of wildfire impacts on organic matter in eroded sediments and topsoil in Mediterranean eucalypt stands

Molecular characterization of wildfire impacts on organic matter in eroded sediments and topsoil in Mediterranean eucalypt stands

Different Molecular Characterization of Soil Particulate Fractions under N Deposition in a Subtropical Forest

Composition of the Green Oil in Hydrogenation of Acetylene over a Commercial Pd‐Ag/Al₂O₃ Catalyst

Contact Info

Product

Resources

About

Appraisal of polycyclic aromatic hydrocarbons (PAHs) in environmental matrices by analytical pyrolysis (Py–GC/MS)

Cited by 75 publications

References 59 publications

Molecular characterization of wildfire impacts on organic matter in eroded sediments and topsoil in Mediterranean eucalypt stands

Molecular characterization of wildfire impacts on organic matter in eroded sediments and topsoil in Mediterranean eucalypt stands

Different Molecular Characterization of Soil Particulate Fractions under N Deposition in a Subtropical Forest

Composition of the Green Oil in Hydrogenation of Acetylene over a Commercial Pd‐Ag/Al2O3 Catalyst

Contact Info

Product

Resources

About

Composition of the Green Oil in Hydrogenation of Acetylene over a Commercial Pd‐Ag/Al₂O₃ Catalyst