Evidence for bias in C/N, δ13C and δ15N values of aquatic and terrestrial organic materials due to acid pre-treatment methods

Brodie, Christopher

doi:10.22498/pages.19.2.65

Cited by 2 publications

(1 citation statement)

References 4 publications

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“…Acidification of samples was necessary to analyze the organic material without inclusion of thermal decomposition of carbonate-carbon. It has been demonstrated that rinsing sediments and soils containing organic material after acid treatment can mobilize some of the organic matter, 59 however the resulting ambiguity of pyrolyzing samples containing carbonate minerals was considered a higher cost to our experimental approach. Thus, samples from Bay Jimmy were also acid treated after inspection for and removal of shell fragments, to ensure that all samples were treated equally for this experiment.…”

Section: Methodsmentioning

confidence: 99%

Varying Relative Degradation Rates of Oil in Different Forms and Environments Revealed by Ramped Pyrolysis

Pendergraft

Rosenheim

2014

Environ. Sci. Technol.

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Degradation of oil contamination yields stabilized products by removing and transforming reactive and volatile compounds. In contaminated coastal environments, the processes of degradation are influenced by shoreline energy, which increases the surface area of the oil as well as exchange between oil, water, sediments, microbes, oxygen, and nutrients. Here, a ramped pyrolysis carbon isotope technique is employed to investigate thermochemical and isotopic changes in organic material from coastal environments contaminated with oil from the 2010 BP Deepwater Horizon oil spill. Oiled beach sediment, tar ball, and marsh samples were collected from a barrier island and a brackish marsh in southeast Louisiana over a period of 881 days. Stable carbon (13C) and radiocarbon (14C) isotopic data demonstrate a predominance of oil-derived carbon in the organic material. Ramped pyrolysis profiles indicate that the organic material was transformed into more stable forms. Our data indicate relative rates of stabilization in the following order, from fastest to slowest: high energy beach sediments > low energy beach sediments > marsh > tar balls. Oil was transformed most rapidly where shoreline energy and the rates of oil dispersion and exchange with water, sediments, microbes, oxygen, and nutrients were greatest. Still, isotope data reveal persistence of oil.

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Section: Methodsmentioning

confidence: 99%

Varying Relative Degradation Rates of Oil in Different Forms and Environments Revealed by Ramped Pyrolysis

Pendergraft

Rosenheim

2014

Environ. Sci. Technol.

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Holocene and Recent Paleoclimate Investigations Using Carbon and Nitrogen Isotopes from Bulk Sediment of Two Subarctic Lakes, Central Northwest Territories

Griffith¹

2013

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Evidence for bias in C/N, δ13C and δ15N values of aquatic and terrestrial organic materials due to acid pre-treatment methods

Cited by 2 publications

References 4 publications

Varying Relative Degradation Rates of Oil in Different Forms and Environments Revealed by Ramped Pyrolysis

Varying Relative Degradation Rates of Oil in Different Forms and Environments Revealed by Ramped Pyrolysis

Holocene and Recent Paleoclimate Investigations Using Carbon and Nitrogen Isotopes from Bulk Sediment of Two Subarctic Lakes, Central Northwest Territories

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