Stability and carbon isotope changes of soot and char materials during thermal oxidation: Implication for quantification and source appointment

Song, Jianzhong; Huang, Weilin; Peng, Ping’an

doi:10.1016/j.chemgeo.2012.08.003

Cited by 12 publications

(10 citation statements)

References 39 publications

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“…Several studies (e.g., Sharma et al, 2012;Han et al, 2007) show that most carbon black samples are somewhat more thermally refractory than diesel soot, which in turn seems to be more refractory than soot from wood burning, at least with respect to the thermal-chemical oxidation method (Song et al, 2012). Therefore, the carbon black experiments can give a reasonable estimate for the loss of more refractory types of soot, but it must be kept in mind that some types of soot or char can be less refractory than carbon black.…”

Section: Discussionmentioning

confidence: 99%

“…Premature loss of EC results in a lower yield of EC, which might make 14 C analysis difficult. Since soot from burning biomass seems to be slightly less refractory than soot from fossil fuel burning, it is more easily lost in step S2, which will affect the source apportionment of EC (e.g., Han et al, 2007;Song et al, 2012;Zhang et al, 2012).…”

Section: U Dusek Et Al: Evaluation Of a Two-step Thermal Methodsmentioning

confidence: 99%

“…However, the use of too harsh oxidation methods that allow only the most refractory part of EC to be recovered have the disadvantage that biomass burning EC is removed to a somewhat larger extent than fossil EC. Biomass burning soot is less refractory than soot from liquid fuels (e.g., Song et al, 2012;Zhang et al, 2012) and has been found to evolve together with chars during thermal treatments rather than with diesel soot. Preferential removal of biomass burning soot thus artificially decreases F 14 C (EC r ) which leads to an underestimate of the fraction modern of EC.…”

Section: Test Proceduresmentioning

confidence: 99%

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Evaluation of a two-step thermal method for separating organic and elemental carbon for radiocarbon analysis

et al. 2014

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Abstract. We thoroughly characterized a system for thermal separation of organic carbon (OC) and elemental carbon (EC) for subsequent radiocarbon analysis. Different organic compounds as well as ambient aerosol filter samples were introduced into an oven system and combusted to CO 2 in pure O 2 . The main objective was to test which combustion times and temperatures are best suited to separate OC and EC. The final separation step for OC was combustion at 360 • C for 15 min. Combustion at this temperature proved enough to remove several organic test substances from the filter (including high molecular weight humic acid) but did not remove substantial amounts of EC. For isolation of EC, OC first needs to be completely removed from the filter. This was achieved by water extraction of the filter, followed by combustion of the water insoluble OC at 360 • C and combustion at an intermediate temperature step of 2 min at 450 • C. This last step removed the most refractory OC together with some EC. Finally, the remaining EC was combusted to CO 2 at 650 • C. The recovery of black carbon after the intermediate 450 • C step was approximately 80 %. Several tests provided strong evidence that OC was removed efficiently during the intermediate temperature step: (i) brown carbon, indicative of refractory OC, was removed; (ii) the fraction modern of EC did not decrease significantly if the temperature of the intermediate step was further increased. Based on tests with various organic compounds, we estimated that charred organic carbon could contribute 4-8 % to an elemental carbon sample that was isolated according to our method.

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Section: Discussionmentioning

confidence: 99%

Section: U Dusek Et Al: Evaluation Of a Two-step Thermal Methodsmentioning

confidence: 99%

Section: Test Proceduresmentioning

confidence: 99%

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Evaluation of a two-step thermal method for separating organic and elemental carbon for radiocarbon analysis

et al. 2014

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“…However, the use of too harsh oxidation methods that allow only the most refractory part of RC to be recovered have the disadvantage that biomass burning soot is likely selectively lost. Biomass burning soot is less refractory than soot from liquid fuels (e.g., Song et al, 2012;Zhang et al, 2012) and has been found to evolve together with chars during thermal treatments rather than with diesel soot. Selective removal of biomass burning soot thus artificially decreases F 14 C (RC e ) which leads to an underestimate of the fraction modern of RC.…”

Section: Discussionmentioning

confidence: 99%

“…Premature loss of RC results in a lower yield of RC, which might make 14 C analysis difficult. Since soot from burning biomass seems to be slightly less refractory than soot from fossil fuel burning, it is more easily lost in step S2, which will affect the source apportionment of RC (e.g., Han et al, 2007;Song et al, 2012;Zhang et al, 2012). The goal of this research is to thoroughly evaluate a separation method for OC and EC based on the THEODORE method that was first proposed by Szidat et al (2004).…”

Section: Introductionmentioning

confidence: 99%

Evaluation of a 2-step thermal method for separating organic and elemental carbon for radiocarbon analysis

Dusek¹,

Monaco²,

Prokopiou³

et al. 2014

Preprint

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Abstract. We thoroughly characterized a system for thermal separation of organic carbon (OC) and elemental carbon (EC) for subsequent radiocarbon analysis. Different organic compounds as well as ambient aerosol filter samples were introduced into an oven system and combusted to CO2 in pure O2. The main objective was to test which combustion times and temperatures are best suited to separate OC and EC. The final separation step for OC was combustion at 360 °C for 15 min. Combustion at this temperature proved enough to remove several organic test substances from the filter (including high molecular weight humic acid) but did not remove substantial amounts of EC. For isolation of EC, OC first needs to be completely removed from the filter. This was achieved by water extraction of the filter, followed by combustion of the water insoluble OC at 360 °C and combustion at an intermediate temperature step of 2 min at 450 °C. This last step removed the most refractory OC together with some EC. Finally, the remaining EC was combusted to CO2 at 650 °C. The recovery of black carbon after the intermediate 450 °C step was approximately 80%. Several tests provided strong evidence that OC was removed efficiently during the intermediate temperature step: (i) brown carbon, indicative of refractory OC, was removed; (ii) the fraction modern of EC did not decrease significantly if the temperature of the intermediate step was further increased. Based on tests with various organic compounds, we estimated that charred organic carbon could contribute 4–8% to an elemental carbon sample that was isolated according to our method.

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Sources and burial fluxes of soot black carbon in sediments on the Mackenzie, Chukchi, and Bering Shelves

Yang

Guo

2018

Continental Shelf Research

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Stability and carbon isotope changes of soot and char materials during thermal oxidation: Implication for quantification and source appointment

Cited by 12 publications

References 39 publications

Evaluation of a two-step thermal method for separating organic and elemental carbon for radiocarbon analysis

Evaluation of a two-step thermal method for separating organic and elemental carbon for radiocarbon analysis

Evaluation of a 2-step thermal method for separating organic and elemental carbon for radiocarbon analysis

Sources and burial fluxes of soot black carbon in sediments on the Mackenzie, Chukchi, and Bering Shelves

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