The Challenge of Developing Primary Standards Mixtures of Carbon Dioxide at Atmospheric Levels

2019 ◽  
pp. 140-165
Author(s):  
Andreia de Lima Fioravante ◽  
Cristiane Rodrigues Augusto ◽  
Claudia Cipriano Ribeiro ◽  
Valnei Smarçaro da Cunha ◽  
Luiz Antônio d'Avila ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Quality Control ◽  
Confidence Level ◽  
Certified Reference Materials ◽  
International Standards ◽  
National Metrology Institute ◽  
Cavity Ringdown Spectroscopy ◽  
Cavity Ringdown ◽  
Primary Standards ◽  
Measurement Capabilities

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.

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

2017 ◽  
Vol 6 (2) ◽  
pp. 1-15 ◽  
Author(s):  
Andreia de Lima Fioravante ◽  
Cristiane Rodrigues Augusto ◽  
Valnei Smarçaro da Cunha ◽  
Luiz Antonio d'Avila
Keyword(s):  
Carbon Dioxide ◽  
International Standards ◽  
Expanded Uncertainty ◽  
High Confidence ◽  
Standard Mixture ◽  
Cavity Ringdown ◽  
Calibration And Measurement Capabilities ◽  
Primary Standards ◽  
High Confidence Level ◽  
Measurement Capabilities

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.

CW-cavity ringdown spectroscopy of carbon dioxide isotopologues near 1.5μm

2006 ◽  
Vol 238 (2) ◽  
pp. 241-255 ◽  
Author(s):  
B.V. Perevalov ◽  
S. Kassi ◽  
D. Romanini ◽  
V.I. Perevalov ◽  
S.A. Tashkun ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Cavity Ringdown Spectroscopy ◽  
Cavity Ringdown

scholarly journals Interlaboratory comparison results of vibration transducers between TÜBITAK UME and Roketsan

ACTA IMEKO ◽  
2020 ◽  
Vol 9 (5) ◽  
pp. 401
Author(s):  
S. Ön Aktan ◽  
E. Bilgiç ◽  
I. Ahmet Yüksel ◽  
K. Berk Sönmez ◽  
T. Kutay Veziroglu ◽  
...  
Keyword(s):  
Proficiency Test ◽  
Interlaboratory Comparison ◽  
International Standards ◽  
National Metrology Institute ◽  
Validity Of Results ◽  
Iso 17025 ◽  
Root Cause ◽  
Comparison Results ◽  
Improve Measurement ◽  
Measurement Capabilities

This paper presents an interlaboratory comparison on vibration metrology field which can be used as a powerful method of checking the validity of results and measurement capabilities according to ISO 17025. In this standard it is advised to participate in an interlaboratory comparison or a proficiency test in order to prove measurement capabilities of calibration providers. In this study it is aimed to statistically evaluate the measurements results in the scope of sinusoidal acceleration between TÜBITAK UME (National Metrology Institute of Turkey) and Roketsan as per related International Standards. After statistical evaluation, for unsatisfactory results, root cause analyses and corrections to improve measurement quality are presented and conceptually explained.

Development and Certification of Formononetin Reference Material for Quality Control of Functional Foods and Botanical Supplements

2019 ◽  
Vol 15 (5) ◽  
pp. 553-559
Author(s):  
Ningbo Gong ◽  
Baoxi Zhang ◽  
Kun Hu ◽  
Zhaolin Gao ◽  
Guanhua Du ◽  
...  
Keyword(s):  
Quality Control ◽  
Reference Material ◽  
Functional Foods ◽  
Certified Reference Materials ◽  
Coulometric Titration ◽  
Pharmaceutical Formulations ◽  
Uncertainty Estimation ◽  
Expanded Uncertainty ◽  
Scanning Calorimetry ◽  
Botanical Supplements

Background: Formononetin is a common soy isoflavonoid that can be found abundantly in many natural plants. Previous studies have shown that formononetin possesses a variety of activities which can be applied for various medicinal purposes. Certified Reference Materials (CRMs) play a fundamental role in the food, traditional medicine and dietary supplement fields, and can be used for method validation, uncertainty estimation, as well as quality control. Methods: The purity of formononetin was determined by Differential Scanning Calorimetry (DSC), Coulometric Titration (CT) and Mass Balance (MB) methods. Results: This paper reports the sample preparation methodology, homogeneity and stability studies, value assignment, and uncertainty estimation of a new certified reference material of formononetin. DSC, CT and MB methods proved to be sufficiently reliable and accurate for the certification purpose. The purity of the formononetin CRM was therefore found to be 99.40% ± 0.24 % (k = 2) based on the combined value assignments and the expanded uncertainty. Conclusion: This CRM will be a reliable standard for the validation of the analytical methods and for quality assurance/quality control of formononetin and formononetin-related traditional herbs, food products, dietary supplements and pharmaceutical formulations.

scholarly journals Challenges in meeting patient assessment international standards in ambulatory tuberculosis services

2020 ◽  
Vol 30 (Supplement_5) ◽  
Author(s):  
L A Aslanyan ◽  
N T Truzyan
Keyword(s):  
Quality Control ◽  
Radiation Safety ◽  
Safety Management ◽  
Management Program ◽  
International Standards ◽  
Capital City ◽  
Diagnostic Tools ◽  
Patient Assessment ◽  
Safety Program ◽  
Environmental Controls

Abstract Background Limitations of tuberculosis (TB) diagnostic tools and measures restrict proper TB control in places with high drug-resistant TB prevalence. This study aimed to explore gaps in the primary health care (PHC) TB services in Armenia compared to international standards on Assessment of Patients (AOP). Methods We applied mixed methods to assess the AOP standards in 30 outpatient TB centers using observational and documents/medical records review's standardized checklists, in-depth interviews, and focus group discussions. Evaluation was conducted in all 10 regions of Armenia and the capital city Yerevan. Joint Commission International Standards for Ambulatory Care, International Standards for TB Care, and WHO framework, served as a guideline for this assessment. Results PHC physicians are qualified for a set of examinations to diagnose TB. Planned reassessments are conducted continuously, though defined writings for the scope and content of reassessments administered by each clinical discipline is absent. Laboratory departments provide high quality services to the TB patients with the defined timeframes for reporting the results. Laboratory and radiology services staff is qualified and experienced. The biosafety rules are compliant with local and international standards. However, the location and conditions of the laboratory departments are mostly non-compliant with the standards. Lack of modern equipment restricts maintaining proper environmental controls, including ventilation systems. Laboratory technicians have little knowledge of the organization's safety management program and its relation to the laboratory safety program. The facilities have neither formal quality control programs regulated by documents and policies nor an identified radiation safety program protocol. Conclusions On the level of AOP standards, the PHC TB services in Armenia have satisfactory performance. However, assessed standards for this function required certain improvements. Key messages In Armenia, the tuberculosis care in PHC facilities presents high level of compliance for patient assessment international standards. To fully meet the standards, facilities need to reconstructed/renovated laboratories and establish the radiology and diagnostic equipment management, quality control and radiation safety programs.

Infrared cavity ringdown spectroscopy of water clusters: O–D stretching bands

1998 ◽  
Vol 109 (23) ◽  
pp. 10201-10206 ◽  
Author(s):  
J. B. Paul ◽  
R. A. Provencal ◽  
C. Chapo ◽  
A. Petterson ◽  
R. J. Saykally
Keyword(s):  
Water Clusters ◽  
Cavity Ringdown Spectroscopy ◽  
Cavity Ringdown
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