The Challenge of Developing Primary Standards Mixtures of Carbon Dioxide at Atmospheric Levels to Establish Traceability to GHG Monitoring Analysis

The Challenge of Developing Primary Standards Mixtures of Carbon Dioxide at Atmospheric Levels to Establish Traceability to GHG Monitoring Analysis

Andreia de Lima Fioravante, Cristiane Rodrigues Augusto, Valnei Smarçaro da Cunha, Luiz Antonio d'Avila
Copyright: © 2017 |Pages: 15
DOI: 10.4018/IJMTIE.2017070101
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Abstract

This article describes how in recent years the need for the quality control, reliability and traceability of analytical results has been strongly emphasised. The National Institute of Metrology, Quality and Technology, is involved in improving calibration and measurement capabilities to provide high confidence level in accordance with the latest regulation regarding greenhouse gases standards. This article describes the gravimetric production of certified gaseous reference materials of carbon dioxide in atmospheric synthetic air that are used to monitor its concentration in the atmosphere. Considering the contributions from gravimetry preparation and its verification analysis by cavity ringdown system (CRDS) the relative expanded uncertainty of the standard mixture of carbon dioxide was lower than 0.5% for the range studied from 370 to 550 μmol/mol, which is comparable to the average of 0,25% relative uncertainties presented on international standards mixtures.
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2. Primary Standard Gas Mixtures Of Ghg Reference Material

The use of reference mixtures/materials with matrix compositions and analytes concentrations similar to those found in environmental samples makes it possible to obtain reliable measurement results. Investigations of samples of different types of gas mixtures are being carried out on an ever greater scale, so there is an increasing need for new techniques in preparing primary standard gas mixtures (PSM).

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