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  • On-line nitrate-delta(15)N extracted from groundwater determined by continuous-flow elemental analyzer/isotope ratio mass spectrometry.

On-line nitrate-delta(15)N extracted from groundwater determined by continuous-flow elemental analyzer/isotope ratio mass spectrometry.

Rapid communications in mass spectrometry : RCM (2000-08-05)
R D Stickrod, J D Marshall
ABSTRACT

Nitrate-delta(15)N from groundwater samples is determined on an inorganic nitrate derivative using automated, continuous-flow elemental analyzer/isotope ratio mass spectrometry (EA/IRMS). Nitrate is extracted and concentrated based on a recently published ion-exchange resin method. Freeze-dried AgNO(3) (0.5-1.5 mg) is packed in silver-foil cups and combusted within the reactor of an NC2500 elemental analyzer (CE Instruments, Milan, Italy) using its existing reaction scheme for nitrogen and carbon analysis. delta(15)N is determined using a Finnigan MAT DELTA(plus) isotope ratio mass spectrometer (Bremen, Germany). Results are drift-corrected to a AgNO(3) working standard that has been calibrated against known AgNO(3). Despite high concentrations of carbonate, the precision for all runs is better than 0.10 per thousand. The combination of this extraction procedure with commercially available delta(15)N analysis instrumentation offers a precise on-line alternative to existing methods, with considerable reduction in labor and analysis time.

MATERIALS
Product Number
Brand
Product Description

Silver, foil, not light tested, 150x150mm, thickness 0.025mm, as rolled, 99.95+%
Silver, foil, not light tested, 50x50mm, thickness 0.01mm, 99.95+%
Silver, foil, not light tested, 100x100mm, thickness 0.025mm, annealed, 99.95+%
Silver, foil, not light tested, 25x25mm, thickness 0.006mm, 99.97%
Silver, foil, not light tested, 50x50mm, thickness 0.005mm, 99.97%
Silver, foil, light tested, 50x50mm, thickness 0.015mm, 99.97%
Silver, foil, not light tested, 50x50mm, thickness 0.009mm, 99.97%
Silver, foil, not light tested, 50x50mm, thickness 0.015mm, 99.97%
Silver, foil, not light tested, 100x100mm, thickness 0.003mm, 99.9%
Silver, foil, 15mm disks, thickness 0.125mm, annealed, 99.95+%
Silver, foil, 25mm disks, thickness 0.25mm, as rolled, 99.95+%
Silver, foil, 4mm disks, thickness 0.007mm, 99.97%
Silver, foil, 15mm disks, thickness 0.015mm, 99.97%
Silver, foil, 2m coil, thickness 0.035mm, as rolled, 99.95+%
Silver, foil, 1m coil, thickness 0.035mm, as rolled, 99.95+%
Silver, foil, 2m coil, thickness 0.0125mm, 99.95+%
Silver, foil, 25mm disks, thickness 0.1mm, annealed, 99.95+%
Silver, foil, 25mm disks, thickness 0.5mm, as rolled, 99.95+%
Silver, foil, 2m coil, thickness 0.0125mm, coil width 9mm, 99.95+%
Silver, foil, 25mm disks, thickness 0.025mm, as rolled, 99.99+%
Silver, foil, 15mm disks, thickness 0.01mm, 99.95+%
Silver, foil, 4mm disks, thickness 0.1mm, as rolled, 99.95+%
Silver, foil, 1m coil, thickness 0.05mm, as rolled, 99.95+%
Silver, foil, 15mm disks, thickness 0.0125mm, 99.95+%
Silver, foil, 4mm disks, thickness 0.02mm, 99.97%
Silver, foil, 25mm disks, thickness 0.007mm, 99.97%
Silver, foil, 4mm disks, thickness 1.0mm, as rolled, 99.95+%
Silver, foil, 4mm disks, thickness 0.015mm, 99.97%
Silver, foil, 25mm disks, thickness 1.0mm, as rolled, 99.95+%
Silver, foil, 50mm disks, thickness 0.035mm, as rolled, 99.95+%