The Challenge of Developing Primary Standards Mixtures of Carbon Dioxide at Atmospheric Levels: Establishing Traceability to Ghg Monitoring Analysis

The Challenge of Developing Primary Standards Mixtures of Carbon Dioxide at Atmospheric Levels: Establishing Traceability to Ghg Monitoring Analysis

Andreia de Lima Fioravante (National Institute of Metrology Standardization and Industrial Quality, Brazil), Cristiane Rodrigues Augusto (National Institute of Metrology Standardization and Industrial Quality, Brazil), Claudia Cipriano Ribeiro (National Institute of Metrology Standardization and Industrial Quality, Brazil), Valnei Smarçaro da Cunha (National Institute of Metrology Standardization and Industrial Quality, Brazil), Luiz Antônio d'Avila (Universidade Federal do Rio de Janeiro, Brazil) and Thays Silva Ximenes (National Institute of Metrology Standardization and Industrial Quality, Brazil)
DOI: 10.4018/978-1-5225-5406-6.ch008

Abstract

In recent years, the need for the quality control, reliability, and traceability of analytical results has been strongly emphasized. The National Metrology Institute – Inmetro is involved in improving measurement capabilities to provide confidence level regarding greenhouse gases standards. The chapter describes the development of certified 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 spectroscopy (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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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).

Primary Reference Materials (PRM) are prepared gravimetrically as Primary Standard Gas mixtures (PSM) by National Metrology Institutes (NMI) using guideline ISO 6142:2015 - “Gas analysis – Preparation of calibration gas mixtures – Weighing methods”. The accuracy level of PRM is the highest commercially available mixture, and therefore, not mended for direct use as working standard calibrating gas analysers, but more as reference standard to which working standards are traceable to.

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