Document Detail

Highly accurate nitrogen dioxide (NO2) in nitrogen standards based on permeation.
MedLine Citation:
PMID:  23148702     Owner:  NLM     Status:  Publisher    
The development and operation of a highly accurate primary gas facility for the dynamic production of mixtures of nitrogen dioxide in nitrogen based on continuous weighing of a permeation tube and accurate impurity quantification and correction of the gas mixtures using FT-IR is described. Nitrogen dioxide gas mixtures in the range of 5 μmol mol-1 to 15 μmol mol-1 with a standard relative uncertainty of 0.4 % can be produced with this facility. To achieve an uncertainty at this level, significant efforts were made to reduce, identify and quantify potential impurities present in the gas mixtures, such as nitric acid (HNO3). A complete uncertainty budget, based on the analysis of the performance of the facility, including the use of a Fourier Transformed InfraRed (FT-IR) spectrometer and a non-dispersive UV analyser as analytical techniques are presented in this work. The mixtures produced by this facility were validated and then selected to provide reference values for the international comparison CCQM-K741, which was designed to evaluate the consistency of primary nitrogen dioxide gas standards from 17 National Metrology Institutes.
Edgar Flores; Joele Viallon; Philippe Moussay; Faraz Idrees; Robert Ian Wielgosz
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-11-14
Journal Detail:
Title:  Analytical chemistry     Volume:  -     ISSN:  1520-6882     ISO Abbreviation:  Anal. Chem.     Publication Date:  2012 Nov 
Date Detail:
Created Date:  2012-11-14     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0370536     Medline TA:  Anal Chem     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
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