Stability studies and purification procedure for nitrite solutions in view of the preparation of isotopic reference materials |
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| Authors: | Wolff J C Ornemark U Taylor P D De Bièvre P |
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| Affiliation: | Institute for Reference Materials and Measurements (IRMM), European Commission-JRC, B-2440 Geel, Belgium. |
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| Abstract: | The lack of reference materials, accurately certified for nitrite, is a problem in view of the importance of this species for environmental and medical reasons. This work outlines a plan for the preparation of nitrite isotopic reference materials (IRMs) in the form of high purity solutions, certified for their nitrite-nitrogen isotopic composition and nitrite concentration. To achieve the desired accuracy (expanded uncertainty U with a coverage factor k=2 of
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