Isotope Ratio Lab

Instrumentation

 

Thermo Delta Plus Isotope Ratio Mass Spectrometer used extensively for the measurement of 2H/1H in water using a chromium reduction inlet.  This magnetic sector instrument is optimized for hydrogen isotope ratio analysis of water samples between 0.2 and 1 g, although analysis of samples as small as 1 uL can be performed. The precision of the d2H measurement is 0.5 permil or 0.08 ppm.

Thermo Delta V Isotope Ratio Mass Spectrometer used extensively for the measurement of 13C/12C, 15N/14N, 18O/16O.  The instrument is equipped with gas bench and elemental analyzer inlets.  The gas bench is used for measurement of 13C/12C in carbon dioxide, and 18O/16O in water by equilibration with carbon dioxide. Specimen size for carbon dioxide is 0.05 mL (STP) and water is 1 g. Precisions are d13C = 0.1 permil (1 ppm) and d18O = 0.1 permil (0.06 ppm).  The elemental analyzer is used for bulk sample analysis of 13C/12C and 15N/14N.  Sample size is 0.5 mg of organic material.  Precisions are d13C = 0.1 permil (1 ppm) and d15N= 0.2 permil (0.6 ppm).

Picarro L2140-i Cavity Ring-down Analyzer used for the analysis of 1H/2H, 18O/16O and 17O/16O in water.  Water specimens of 0.2 g are required, but smaller samples can be analyzed upon special request. Precisions are d2H = 0.1 permil (0.02 ppm) and d18O = 0.03 permil (.02 ppm).