Chemical diversity of pyrograms as a discriminating parameter in soil humus and plant residues

Alcañiz, Josep M.; Serés, Anna Astals; Comellas, L.; Cabeza, L.; Gassiot, M.

doi:10.1016/0048-9697(88)90375-0

Cited by 4 publications

(4 citation statements)

References 14 publications

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“…This, however, maybe unfortunately over-estimated by pyrolysis techniques, sugars under high temperature being able to lead to cyclization of their molecule [34]. This character appears with more or less importance in the riverine and lacustrine waters [1,3] which turns the interpretation of results more difficult.…”

Section: Particulate Fraction (C1)mentioning

confidence: 97%

“…Twenty three major peaks were selected on the pyrochromatograms and each selected compound was expressed as a percentage of the sum of the area of these 23 peaks [1]. Pyrolysis products were grouped into five main families, each of them including similar molecules or close chemical structures: aromatic hydrocarbons, nitrogenous compounds, sugars, phenols and amino sugars [12].…”

Section: Methodsmentioning

confidence: 99%

“…These compounds, benzene and toluene, which could also comprise phenol, have been related to long-term transformation of organic matter, such as a long pedologic transformation where organic matter forms the clayey-humic complex [1]. Furthermore, within colloidal or dissolved carbon in waters, the abundance of polyhydroxyaromatics is an indication of allochthonous organic material [4].…”

Section: Acetonitrile/pyrrolementioning

confidence: 99%

“…A number of characteristic ratios calculated after references [1,12], slightly modified, can give indications about the trends of transformation of the organic matter. They are generally used to compare organic matter composition to the supposed transformation processes in the course of humification, i.e.…”

Section: Agriculture and Environmentmentioning

confidence: 99%

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Biogeochemical characteristics of organic matter in the particulate and colloidal fractions downstream of the rio Negro and Solimoes rivers confluence

et al. 2000

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-The analysis of organic matter in the rio Negro, rio Solimões and rio Amazonas focused on total organic carbon (TOC), as determined at two main sizes, the particulate form (> 0.2 µm) and the colloidal form (0.2 µm to 5000 dalton). These fractions were obtained by tangential ultrafiltration carried out on 50 l water samples. The total polysaccharide contents were determined by a colorimetric method, the main classes of organic compounds by pyrolysis and gas chromatography coupled with mass spectrometry (Py-GC-MS), and the lignin or non-lignin phenols by cupric oxide alkaline oxidation and high performance liquid chromatography (HPLC) with photodiode array spectrophotometer detection. Upstream of the confluence of the rio Negro and rio Solimões, the rivers show characteristic differences. The rio Negro has low discharge, high levels of TOC% for the two fractions, high levels of polysaccharides, low levels of lignin phenols and high levels of hydroxybenzyl non-lignin phenols. The main classes of organic compounds also give a distribution different for the particulate (phenols associated to aromatic compounds) and the colloidal (aromatic compounds and sugars). For the rio Solimões, the compositional features are generally reversed. Downstream of the confluence, the colloidal fraction showed noteworthy levels of lignin-derived compounds associated with increasing levels of polysaccharides correlated to the distance from the confluence. biogeochemistry / organic matter / Py-GC-MS / HPLC / phenols / lignin / particulate / colloidalRésumé -Caractères biogéochimiques de la matière organique particulaire et colloïdale en aval de la confluence des rios Negro et Solimões. L'analyse de la matière organique dans les eaux du rio Negro, du rio Solimões et du rio Amazonas a porté sur la charge totale en suspension (TSM) ainsi que sur les fractions particulaire (> 0.2 µm) et colloï-dale (0.2 µm à 5000 dalton). Ces fractions ont été obtenues par ultrafiltration tangentielle exécutée sur des échantillons

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Section: Particulate Fraction (C1)mentioning

confidence: 97%

Section: Methodsmentioning

confidence: 99%