The nitrogen isotopic ratio (¥ä15N) has been used extensively as an indicator of the source of nitrate in the hydrosphere and as a measure of the degree of isotopic fractionation caused by chemical transformations such as denitrification. The analysis of O-isotopic composition of nitrate has many potential applications in studies of environmental processes. Oxygen-isotope nitrate analysis requires samples free of other oxygen-containing compounds. Non-nitrate-oxygen compounds will bias O-isotopic data. Therefore, an efficient clean-up method was developed to isolate nitrate from natural water samples. In a multi-step clean-up procedure using adsorption onto water-insoluble polyvinylpyrrolidone, removal of almost all other oxygen-containing compounds, such as fulvic acids, and isolation of nitrate, was achieved. The method was applied to set of surface- and soil-water samples. Samples free of non-nitrate oxygen were obtained. Subsequent combustion to CO2 was conducted and the 18O/16O ratio values were determined.
|Titel||International Symposium on nuclear techniques in integrated plant nutrient, water and soil management|
|Publikationsstatus||Veröffentlicht - 2002|
|Veranstaltung||International Symposium on Nuclear Techniques in Integrated Plant Nutrient, Water and Soil Management - |
Dauer: 1 Jan. 2002 → …
|Konferenz||International Symposium on Nuclear Techniques in Integrated Plant Nutrient, Water and Soil Management|
|Zeitraum||1/01/02 → …|
- Nicht definiert