Materials with known ¹⁵N/¹⁴N isotopic composition

USGS25, Ammonium Sulfate

Unit Size: 0.5g
Price per Unit: 130 €
Report: IAEA-TECDOC-825
Date of Release: 1995

USGS25 is a dried salt of ammonium sulfate [(NH₄)₂ SO₄]) which was prepared in 1992 by J. K. Böhlke, U.S. Geological Survey [1]. The material was prepared from Fisher ammonium sulfate (A938-500, lot #915021) and Cambridge Isotopes ammonium sulfate (99.99% ¹⁴N; lot BI 1328) BI 1050) by dissolving and re-crystallising a mixture of normal reagent salt and ¹⁵N depleted salt. The δ¹⁵N value of this reference material is the result of the statistical evaluation of inter-comparison exercises [1,2].

Analyte	Value	Unit	SD	R/I/C
δ15N	-30.4	‰air N2	0.4	C

(R/I/C) Classification assigned to the property value for analyte (Recommended/Information/Certified)

References:

1. Böhlke, J. K., Gwinn, C. J., Coplen, T. B. (1993): New reference materials for nitrogen isotope ratio measurements. Geostandards Newsletter, vol. 17, No. 1, (April 1993), 159 164.
2. Böhlke, J.K., Coplen, T.B. (1995): 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, 51 66.