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Seasonal variations in the concentrations of methyl and ethyl nitrate in a shallow freshwater lake

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Author(s)

  • Claire Hughes
  • Anthony Kettle
  • Godwin Unazi
  • Keith Weston
  • Matthew Jones
  • Martin Johnson

Department/unit(s)

Publication details

JournalLIMNOLOGY AND OCEANOGRAPHY
DatePublished - Jan 2010
Issue number1
Volume55
Number of pages9
Pages (from-to)305-314
Original languageEnglish

Abstract

Between February and October 2007, a time series of alkyl nitrate concentrations in the water column of a shallow freshwater lake, University of East Anglia Broad, located in southeastern England was carried out to determine whether methyl and ethyl nitrate are present in freshwater systems and to improve understanding of alkyl nitrate production mechanisms in aquatic environments. Concentrations ranged from 4.7 (6 0.5) to 53.7 (64.36) pmol L21 methyl nitrate, and 2.5 (6 0.3) to 11.1 (6 0.4) pmol L21 ethyl nitrate and were within the range of those measured previously in seawater. Peaks in the concentrations of methyl and ethyl nitrate at 4 m were observed in 9 and 6 of the 18 depth profiles measured, respectively. Gradients in concentrations within the hypolimnion
suggest that the alkyl nitrates are produced in the bottom waters or sediments, are transported to the lake in groundwater, or both. Colored dissolved organic matter absorbance data suggests that the penetration of ultraviolet
light was limited in the lake, so the deep maxima must be due to a non-photochemical alkyl nitrate source.

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