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Ammonium Sulfate

Reference material IAEA-N-2 is aimed at δ15N calibrations.

The IAEA-N-2 is a relatively coarse grained dried salt of ammonium sulfate [(NH4)2 SO4] prepared by E. Salati, CENA (Centro de Energia Nuclear na Agricultura), Brazil, in the period of 1978 to 1983 [1, 2]. Its δ15N value is determined using data from several interlaboratory comparisons and assessments [2-5].


Stable Isotope RatioReference ValueStandard Uncertainy with k=1


  1. GONFIANTINI, R., Standards for stable isotope measurements in natural compounds, Nature 271 (1978) 534-536.
  2. GONFIANTINI, R., Advisory group meeting on stable isotope reference samples for geochemical and hydrochemical investigations, IAEA, Vienna, 19-21 September 1983. Report to the Director General. International Atomic Energy Agency, Vienna, Austria (1984).
  3. BÖHLKE, J.K., GWINN, C.J., COPLEN, T.B., New reference materials for nitrogen isotope ratio measurements, Geostandards Newsletter 17 1 (1993) 159-164.
  4. KENDALL, C., GRIM, E., Combustion tube method for measurement of nitrogen isotope ratios using calcium oxide for total removal of carbon dioxide and water, Anal. Chem. 62 (1990) 526-529.
  5. BÖHLKE, J.K., COPLEN, T.B., "Interlaboratory comparison of reference materials for nitrogen-isotope-ratio measurements", Proceedings of a consultants' meeting held in Vienna, 1 - 3. Dec. 1993, IAEA-TECDOC-825, IAEA, Vienna, Austria (1995) 51-66.
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