USGS32 , Potassium Nitrate

Inorganic , Pure Substance

  • International Chemical Safety Card (ICSC): ICSC_0184

USGS32 is a dried salt of potassium nitrate, KNO3 which was prepared in 1992 by J. K. Böhlke, U.S. Geological Survey [1] from Baker potassium nitrate (3190-01, lot #D40117 and 3190-05, lot #19162) and Cambridge Isotopes potassium nitrate (5% 15N, lot #F 2685). This salt material was prepared by dissolving and re-crystallizing a mixture of normal reagent salt and 15N enriched salts. Its δ15N value is determined using data from an interlaboratory comparison [2].

Analyte Value Unit SD R/I/C
δ15N +180 air N2 1 C
δ18O +25.7 VSMOW 0.4 R

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


  1. BÖHLKE, J.K., GWINN, C.J., COPLEN, T.B., New reference materials for nitrogen isotope ratio measurements, Geostandards Newsletter 17 1 (1993) 159-164.

  2. 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, INTERNATIONAL ATOMIC ENERGY AGENCY, Vienna, Austria (1995) 51-66.


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