In routine chemical measurements traceability can be achieved by using analytical instruments calibrated against primary reference materials. In the present work the calibration of a CO2 nondispersive infrared (NDIR) analyzer with measuring range 0-2000 umol/mol of CO2 and a resolution of 5 umol/mol is reported. A procedure with working reference gas mixtures (WRMs) has been adopted, which requires seven calibration points. Primary reference gas mixtures (PRMs) are used to validate WRMs in a narrower range around the average atmospheric CO2 concentration value. In this range the relative uncertainty reached is of the order of some parts in 10(3) and the corrections are between 1 umol/mol and 5 umol/mol
Traceability in routine chemical measurements: an example of application in the determination of CO2 at atmospheric concentration / Sega, Michela; Plassa, M; AMICO DI MEANE, E.. - In: ACCREDITATION AND QUALITY ASSURANCE. - ISSN 0949-1775. - 6:7(2001), pp. 306-309. [10.1007/s007690100315]
Traceability in routine chemical measurements: an example of application in the determination of CO2 at atmospheric concentration
SEGA, MICHELA;
2001
Abstract
In routine chemical measurements traceability can be achieved by using analytical instruments calibrated against primary reference materials. In the present work the calibration of a CO2 nondispersive infrared (NDIR) analyzer with measuring range 0-2000 umol/mol of CO2 and a resolution of 5 umol/mol is reported. A procedure with working reference gas mixtures (WRMs) has been adopted, which requires seven calibration points. Primary reference gas mixtures (PRMs) are used to validate WRMs in a narrower range around the average atmospheric CO2 concentration value. In this range the relative uncertainty reached is of the order of some parts in 10(3) and the corrections are between 1 umol/mol and 5 umol/molI documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
