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TitleSimultaneous analysis of nitrogen and triple oxygen isotopes in low-amount atmospheric samples on filters - How low can we go?
AuthorSmirnoff, A; Savard, M M; Vet, R; Marion, J; Simard, M C
SourceAdvances in Stable Isotope Techniques and Applications workshop (ASITA 2013), abstracts; 2013.
LinksOnline - En ligne (PPT)
Alt SeriesEarth Sciences Sector, Contribution Series 20130210
PublisherThe University of Calgary
PublisherIsotope Science Laboratories ( ISL)
MeetingAdvances in Stable Isotope Techniques and Applications workshop (ASITA 2013); Calgary; CA; 2013
Subjectsgeochemistry; oxygen isotopes; isotopes; isotopic studies; nitrogen; analytical methods
ProgramCoal & Oil Resources Environmental Sustainability, Environmental Geoscience
AbstractWe previously showed that the approach combining the cadmium reduction method with sodium azide reduction and subsequent on-line thermal decomposition and IRMS analysis can be successfully applied to a wide variety of samples including those with relatively low concentrations of nitrate (NO3-) and ammonium (NH4+). However, the method was initially used to treat samples with concentrations above 0.1mg N/L in both, NO3- and NH4+. Recently, we encountered a situation when we had to treat and analyze tiny amount of nitrogen-containing material collected by nylon and Teflon filters of active air samplers as well as by Maxxam active-passive samplers. This interesting challenge has brought us to test if the above approach can be further modified to accommodate such samples by reducing the target concentration during pre-analytical treatment. Here we present the results of these tests and discuss pros and cons of lowering sample concentrations.
Summary(Plain Language Summary, not published)
The new approach previously developed by the GSC team to analyze nitrogen-bearing atmospheric samples was designed to treat and analyze samples with moderate concentrations (higher than 0.1 mg/L).The GSC collaboration with Environment Canada characterizing Albertan emissions brought samples to be treated but with much lower nitrogen amounts. This challenging situation required our team to successfully modify the previously developed treatment and analytical approach to accommodate such samples.