Document Detail

Application of the 15N technique to determine the contributions of nitrification and denitrification to the flux of nitrous oxide from aerated pig slurry.
MedLine Citation:
PMID:  11456178     Owner:  NLM     Status:  MEDLINE    
In order to elucidate and quantify nitrogen transformations occurring during aerobic treatment of pig slurry, two laboratory experiments were carried out with contrasting levels of aeration, high level (experiment 1) and low level (experiment 2) of aeration. During these experiments, after reaching steady-state conditions, a single pulse of NO3(-)-15N tracer was added directly to the reactor. When nitrification conditions were prevailing (experiment 1), no transformation of added NO3(-)-15N occurred (98.7% 15N-recovery as nitrates in the liquid slurry). Moreover, the unlabelled nitrous oxide (N2O) measured (7.4% of the total nitrogen content of the raw slurry) strongly demonstrated that the source of N2O emitted was nitrification. During simultaneous nitrification and denitrification conditions (experiment 2), the added NO3(-)-15N was found in gaseous nitrogen forms (N2O-15N: 27%; N2-15N: 18%) and in the liquid (TN-15N: 54%). From this result, it was evident that N2O was mainly emitted by denitrification process. Using the decrease of the isotopic excess of the NO3(-)-15N we calculated that 92% of NO2(-)-N was directly denitrified (as gaseous forms) without any previous oxidation to nitrate.
F Beline; J Martinez; C Marol; G Guiraud
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Water research     Volume:  35     ISSN:  0043-1354     ISO Abbreviation:  Water Res.     Publication Date:  2001 Aug 
Date Detail:
Created Date:  2001-07-17     Completed Date:  2001-12-11     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0105072     Medline TA:  Water Res     Country:  England    
Other Details:
Languages:  eng     Pagination:  2774-8     Citation Subset:  IM    
Cemagref, Livestock and Municipal Waste Management Research Unit, Rennes, France.
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MeSH Terms
Environmental Monitoring / methods
Gases / metabolism
Industrial Waste / analysis
Nitrates / administration & dosage,  metabolism*
Nitrites / metabolism*
Nitrogen Radioisotopes
Nitrous Oxide / metabolism*
Oxygen / metabolism*
Sewage / analysis*,  chemistry
Reg. No./Substance:
0/Gases; 0/Industrial Waste; 0/Nitrates; 0/Nitrites; 0/Nitrogen Radioisotopes; 0/Sewage; 10024-97-2/Nitrous Oxide; 7782-44-7/Oxygen

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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