Nitration Effect on the Yield and Chemical Composition of Humic Acids Obtained from South Brazil Coal Samples

Brocchi, E. A.; Dick, Deborah Pinheiro; Leite, Anderson José Barcellos

doi:10.1007/978-94-007-5634-2_209

Cited by 1 publication

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“…Carbon to nitrogen (C/N) ratios decreased from 72.8 to 17.1 for the SRFA and from 21.4 to 16.3 for the PFA. The N R /N 0 values compare to N R /N 0 ratios of 1.5 to 4.5 and 2.2 to 5.8 for low rank South Brazilian coals treated with 11% and 25% nitric acid, respectively [ 1 ]. Because the SRFA, SRNOM, and PFA dissolve into the nitric acid solution, whereas the bulk peat and coal do not, by necessity reaction conditions differ for the samples.…”

Section: Resultsmentioning

confidence: 99%

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Nitrosation and Nitration of Fulvic Acid, Peat and Coal with Nitric Acid

Thorn

Cox

2016

PLoS ONE

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Nitrohumic acids, produced from base extraction of coals and peats oxidized with nitric acid, have received considerable attention as soil ammendments in agriculture. The nitration chemistry however is incompletely understood. Moreover, there is a need to understand the reaction of nitric acid with natural organic matter (NOM) in general, in the context of a variety of environmental and biogeochemical processes. Suwannee River NOM, Suwannee River fulvic acid, and Pahokee Peat fulvic acid were treated with 15N-labeled nitric acid at concentrations ranging from 15% to 22% and analyzed by liquid and solid state 15N NMR spectroscopy. Bulk Pahokee peat and Illinois #6 coal were also treated with nitric acid, at 29% and 40% respectively, and analyzed by solid state 15N NMR spectroscopy. In addition to nitro groups from nitration of aromatic carbon, the 15N NMR spectra of all five samples exhibited peaks attributable to nitrosation reactions. These include nitrosophenol peaks in the peat fulvic acid and Suwannee River samples, from nitrosation of phenolic rings, and N-nitroso groups in the peat samples, from nitrosation of secondary amides or amines, the latter consistent with the peat samples having the highest naturally abundant nitrogen contents. Peaks attributable to Beckmann and secondary reactions of the initially formed oximes were present in all spectra, including primary amide, secondary amide, lactam, and nitrile nitrogens. The degree of secondary reaction product formation resulting from nitrosation reactions appeared to correlate inversely with the 13C aromaticities of the samples. The nitrosation reactions are most plausibly effected by nitrous acid formed from the reduction of nitric acid by oxidizable substrates in the NOM and coal samples.

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Section: Resultsmentioning

confidence: 99%

“…Nitrohumic acids have received considerable attention as potential soil amendments for nitrogen fertilization and numerous other applications, such as plant biostimulants and chelating agents for metals [ 1 – 4 ]. They are typically produced from basic extraction of coals that have been subjected to oxidation with nitric acid.…”

Section: Introductionmentioning

confidence: 99%

Nitrosation and Nitration of Fulvic Acid, Peat and Coal with Nitric Acid

Thorn

Cox

2016

PLoS ONE

View full text Add to dashboard Cite

show abstract

Nitration Effect on the Yield and Chemical Composition of Humic Acids Obtained from South Brazil Coal Samples

Cited by 1 publication

References 6 publications

Nitrosation and Nitration of Fulvic Acid, Peat and Coal with Nitric Acid

Nitrosation and Nitration of Fulvic Acid, Peat and Coal with Nitric Acid

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