Thermal analysis (TG–DTA) and isotopic characterization (13C–15N) of humic acids from different origins

Francioso, Ornella; Montecchio, Daniela; Gioacchini, Paola; Ciavatta, Claudio

doi:10.1016/j.apgeochem.2004.10.003

Cited by 100 publications

(59 citation statements)

References 43 publications

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“…Seventynine percent of total SOM was decomposed and 49% of the overall weight losses were observed in this temperature range. The location of this peak ($300°C) exactly coincided with the first exothermic peaks observed by decomposition of humic acids extracted from different peats, lignites and leonardites (Francioso et al, 2005). This exothermic peak probably reflected thermal combustion of polysaccharides, decarboxylation of acidic groups and dehydration of hydroxylate aliphatic structures (Dell'Abate et al, 2002).…”

Section: Thermal Stabilitymentioning

confidence: 69%

“…Thermal analysis coupled with differential scanning calorimetry (TG-DSC) is widely applied in coal, charcoal, peat, compost and lignite studies (see references in Lopez-Capel et al, 2005 andin Francioso et al, 2005). It has also been used to evaluate the humification state of SOM (Grisi et al, 1998;Siewert, 2001Siewert, , 2004, the origin of humic acids (Francioso et al, 2005), and qualitative SOM alterations by various land uses (Plante et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

“…Isotopic analyses are often performed on SOM fractions including density fractions (John et al, 2005;Magid et al, 2002) and particle size fractionation (Jolivet et al, 2003;Ludwig et al, 2003) as well as sequential extractions separated by various methods (Ellerbrock and Kaiser, 2005). Another method that is suitable for SOM fractionation is based on the different thermal stability of various C fractions in soil (Francioso et al, 2005;Lopez-Capel et al, 2005;Plante et al, 2005;Siewert, 2001Siewert, , 2004. Thermal analysis coupled with differential scanning calorimetry (TG-DSC) is widely applied in coal, charcoal, peat, compost and lignite studies (see references in Lopez-Capel et al, 2005 andin Francioso et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

“…Another method that is suitable for SOM fractionation is based on the different thermal stability of various C fractions in soil (Francioso et al, 2005;Lopez-Capel et al, 2005;Plante et al, 2005;Siewert, 2001Siewert, , 2004. Thermal analysis coupled with differential scanning calorimetry (TG-DSC) is widely applied in coal, charcoal, peat, compost and lignite studies (see references in Lopez-Capel et al, 2005 andin Francioso et al, 2005). It has also been used to evaluate the humification state of SOM (Grisi et al, 1998;Siewert, 2001Siewert, , 2004, the origin of humic acids (Francioso et al, 2005), and qualitative SOM alterations by various land uses (Plante et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

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Effect of C3–C4 Vegetation Change on δ13C and δ15N Values of Soil Organic Matter Fractions Separated by Thermal Stability

2006

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Carbon isotopic composition of soils subjected to C 3 -C 4 vegetation change can be used to estimate C turnover in bulk soil and in soil organic matter (SOM) pools with fast and intermediate turnover rates. We hypothesized that the biological availability of SOM pools is inversely proportional to their thermal stability, so that thermogravimetry can be used to separate SOM pools with contrasting turnover rates. Soil samples from a field plot cultivated for 10.5 years with the perennial C 4 plant MiscanthusÂgigantheus were analyzed by thermogravimetry coupled with differential scanning calorimetry (DSC). Three SOM fractions were distinguished according to the differential weight losses and exothermic or endothermic reactions measured by DSC. The d 13 C and d 15 N values of these three fractions obtained by gradual soil heating were measured by IRMS. The weight losses up to 190°C mainly reflected water evaporation because no significant C and N losses were detected and d 13 C and d 15 N values of the residual SOM remained unchanged. The d 13 C values ()16.4&) of SOM fraction decomposed between 190 and 390°C (containing 79% of total soil C) were slightly closer to that of the Miscanthus plant tissues (d 13 C=)11.8&) compared to the d 13 C values ()16.8&) of SOM fraction decomposed above 390°C containing the residual 21% of SOM. Thus, the C turnover in the thermally labile fraction was faster than that in thermally stable fractions, but the differences were not very strong. Therefore, in this first study combining TG-DSC with isotopic analysis, we conclude that the thermal stability of SOM was not very strongly related to biological availability of SOM fractions. In contrast to d 13 C, the d 15 N values strongly differed between SOM fractions, suggesting that N turnover in the soil was different from C turnover. More detailed fractionation of SOM by thermal analysis with subsequent isotopic analysis may improve the resolution for d 13 C.

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Section: Thermal Stabilitymentioning

confidence: 69%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Effect of C3–C4 Vegetation Change on δ13C and δ15N Values of Soil Organic Matter Fractions Separated by Thermal Stability

2006

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“…The first significant temperature range for the transformation of organic matter is attributed to a range of 200 to 400°C and is related to the degradation of less thermally stable structures, generally characterized by a less condensed structure. The loss of mass in this temperature range is attributed to changes such as degradation of carbohydrates, dehydration of aliphatic structures, and decarboxylation of carboxylic groups (Francioso et al 2005;Pertusatti and Prado, 2007;Rotaru et al 2008;Klavins et al 2010;Sirbu et al, 2010). These changes in the DTA graph are reflected in the form of exothermic peaks at a temperature close to 300°C, especially sharp for samples of humic acids obtained using NaOH solutions.…”

Section: Resultsmentioning

confidence: 99%

Evaluation of the possibilities of using humic acids obtained from lignite in the production of commercial fertilizers

Huculak-Mączka

Hoffmann

2018

J Soils Sediments

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Purpose Technological progress and high market demand contributed to a significant interest in the production of fertilizers based on humic acids. The aim of this study was to evaluate the possibilities of using humic acids obtained from lignite in the production of new commercial products. For this purpose, it is necessary to determine the quality standard requirements for such material. Properties of humic acids depend on source of origin as well as method of its extraction. Materials and methods The humic acids were extracted from polish deposit of lignite-Sieniawa Lubuska by alkaline extraction using for this purpose six kinds of extractants: 0.1 M NaOH and 0.25 M NaOH, 0.1 M KOH and 0.25 M KOH, and 0.1 M Na 4 P 2 O 7 and 0.25 M Na 4 P 2 O 7 . The humic samples were used in solid powder form and characterized by UV-Vis spectroscopy, 13 C NMR spectroscopy, fluorescence spectroscopy, and thermal analysis. Results and discussion The determining factor influencing a degree of humic acids extraction from lignite and their structure is type of extractant. The largest efficiency of extraction (about 50%) was obtained with the use of NaOH solutions. All examined humic acids were generally characterized by simple and heterogeneous molecularly structure with low molecular weight and low aromatic polycondensation. Therefore, it can be concluded that humic acids extracted with NaOH and KOH solutions are less condensed than those extracted with Na 4 P 2 O 7 solutions. It can suggest that humic acids obtained from lignite using solutions of Na 4 P 2 O 7 are characterized by a low transformation degree and greater amount of carboxyl groups. Conclusions Low rank coal can be successfully used in agriculture as a rich source of humic acids. Reagent used in their extraction, apart from high efficiency should have a neutral impact on their structure. Studies on the physicochemical properties of humic acids can be helpful in predicting behaviors of such fertilizer components in the environment and in inventing new products taking the principles of sustainable development into consideration.

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What happens to soil organic carbon as coastal marsh ecosystems change in response to increasing salinity? An exploration using ramped pyrolysis

Williams

Rosenheim

2015

Geochem Geophys Geosyst

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Coastal wetlands store vast amounts of organic carbon, globally, and are becoming increasingly vulnerable to the effects of anthropogenic sea level rise. To understand the effect of sea level rise on organic carbon fate and preservation in this global sink, it is necessary to characterize differences in the biogeochemical stability of coastal wetland soil organic carbon (SOC). Here we use ramped pyrolysis/oxidation decomposition characteristics as proxies for SOC stability to understand the fate of carbon storage in coastal wetlands comprising the Mississippi River deltaic plain, undergoing rapid rates of local sea level rise. Soils from three wetland types (fresh, brackish, and salt marshes) along a salinity gradient were subjected to ramped pyrolysis analysis to evaluate decomposition characteristics related to thermochemical stability of SOC. At equivalent soil depths, we observed that fresh marsh SOC was more stable than brackish and salt marsh SOC. Depth, isotopic, elemental, and chemical compositions, bulk density, and water content of SOC all exhibited different relationships with SOC stability across the marsh salinity gradient, indicative of different controls on SOC stability within each marsh type. The differences in stability imply stronger preservation potential of fresh marsh soil carbon, compared to that of salt and brackish marshes. Considering projected marsh ecosystem responses to sea level rise, these observed stability differences are important in planning and implementing coastal wetland carbon-focused remediation and improving climate model feedbacks with the carbon cycle. Specifically, our results imply that ecosystem changes associated with sea level rise will initiate the accumulation of less stable carbon in coastal wetlands.

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Thermal analysis (TG–DTA) and isotopic characterization (13C–15N) of humic acids from different origins

Cited by 100 publications

References 43 publications

Effect of C3–C4 Vegetation Change on δ13C and δ15N Values of Soil Organic Matter Fractions Separated by Thermal Stability

Effect of C3–C4 Vegetation Change on δ13C and δ15N Values of Soil Organic Matter Fractions Separated by Thermal Stability

Evaluation of the possibilities of using humic acids obtained from lignite in the production of commercial fertilizers

What happens to soil organic carbon as coastal marsh ecosystems change in response to increasing salinity? An exploration using ramped pyrolysis

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