Long-term stability test of elemental content in new environmental certified reference material candidates using ICP OES and ICP-SFMS

Toxin Reviews ◽  
2019 ◽  
pp. 1-9 ◽  
Author(s):  
Abubakr M. Idris ◽  
Ahmed O. Alnajjar ◽  
Turki S. Alkhuraiji ◽  
Khaled F. Fawy
Keyword(s):  
Reference Material ◽  
Certified Reference Material ◽  
Stability Test ◽  
Elemental Content ◽  
Icp Oes ◽  
Term Stability ◽  
Long Term Stability

scholarly journals Development of a Water Matrix Certified Reference Material for Volatile Organic Compounds Analysis in Water

Molecules ◽  
2021 ◽  
Vol 26 (14) ◽  
pp. 4370
Author(s):  
Liping Fang ◽  
Linyan Huang ◽  
Gang Yang ◽  
Yang Jiang ◽  
Haiping Liu ◽  
...  
Keyword(s):  
Volatile Organic Compounds ◽  
Reference Material ◽  
Organic Compounds ◽  
Certified Reference Material ◽  
Pure Water ◽  
Term Stability ◽  
Long Term Stability ◽  
Water Matrix ◽  
Volatile Organic

Water matrix certified reference material (MCRM) of volatile organic compounds (VOCs) is used to provide quality assurance and quality control (QA/QC) during the analysis of VOCs in water. In this research, a water MCRM of 28 VOCs was developed using a “reconstitution” approach by adding VOCs spiking, methanol solution into pure water immediately prior to analysis. The VOCs spiking solution was prepared gravimetrically by dividing 28 VOCs into seven groups, then based on ISO Guide 35, using gas chromatography-mass spectrometry (GC-MS) to investigate the homogeneity and long-term stability. The studies of homogeneity and long-term stability indicated that the batch of VOCs spiking solution was homogeneous and stable at room temperature for at least 15 months. Moreover, the water MCRM of 28 VOCs was certified by a network of nine competent laboratories, and the certified values and expanded uncertainties of 28 VOCs ranged from 6.2 to 17 μg/L and 0.5 to 5.3 μg/L, respectively.

Experience with Certified Reference Material Proficiency Testing for Quality Control of Wheat

1998 ◽  
Vol 6 (A) ◽  
pp. A53-A61
Author(s):  
Judit Budai ◽  
Judit Fükó
Keyword(s):  
Quality Control ◽  
Reference Material ◽  
Proficiency Testing ◽  
Reference Materials ◽  
Certified Reference Material ◽  
Certified Reference Materials ◽  
Long Term Stability ◽  
Determining Factors ◽  
Chemical Section

The Chemical Section of OMH1,2 embarked on the preparation of a series of wheat samples as Certified Reference Materials (CRMs) in 1992. The certification processes were carried out according to the recommendations of ISO. Since then we have developed a series of flour samples as well. The investigations of the long-term stability and the application of wheat and flour CRMs are continuous. Wheat is one of the most widely grown crops in Hungary and it is one of the major determining factors of the economy. Its uniform and objective qualification is of great importance. There are well-equipped laboratories available with sufficient experience but, as the proficiency testing regularly showed, certified samples need to be used to achieve exact and uniform measuring results.

Long Term Stability Test of Biogas Production from Cattle Manure Using Rumen Fluid as Inoculum

2018 ◽  
Vol 24 (12) ◽  
pp. 9559-9562
Author(s):  
Budiyono ◽  
Siswo Sumardiono ◽  
I. Nyoman Widiasa ◽  
Hashfi Hawali Abdul Matin
Keyword(s):  
Biogas Production ◽  
Rumen Fluid ◽  
Cattle Manure ◽  
Stability Test ◽  
Term Stability ◽  
Long Term Stability

scholarly journals Development studies of captopril certified reference material

2011 ◽  
Vol 47 (2) ◽  
pp. 339-350 ◽  
Author(s):  
Raquel Nogueira ◽  
Eliane Cristina Pires do Rego ◽  
Marcus Vinicius Barreto Sousa ◽  
Wagner Wollinger ◽  
Thaís Elias da Silva ◽  
...  
Keyword(s):  
Reference Material ◽  
Certified Reference Material ◽  
Active Pharmaceutical Ingredient ◽  
Stability Studies ◽  
Long Term Stability ◽  
Short And Long Term ◽  
Determination Of Impurities ◽  
Mass Balance Approach

This paper describes the studies performed with the candidate Certified Reference Material (CRM) of captopril, the first CRM of an active pharmaceutical ingredient (API) in Brazil, including determination of impurities (organic, inorganic and volatiles), homogeneity testing, short- and long-term stability studies, calculation of captopril content using the mass balance approach, and estimation of the associated measurement uncertainty.

Feasibility study of a reference material for water chemistry: Long term stability of triazine and phenylurea residues stored in vials or on polymeric sorbents

2006 ◽  
Vol 1123 (1) ◽  
pp. 31-37 ◽  
Author(s):  
Jérôme Deplagne ◽  
Jérôme Vial ◽  
Valérie Pichon ◽  
Béatrice Lalere ◽  
Gilles Hervouet ◽  
...  
Keyword(s):  
Reference Material ◽  
Water Chemistry ◽  
Feasibility Study ◽  
Term Stability ◽  
Long Term Stability ◽  
Polymeric Sorbents

scholarly journals Long-term stability of measurements of the elemental composition of steel using a vacuum atomic emission spectrometer «Grand-Expert»

2019 ◽  
Vol 85 (1II)) ◽  
pp. 135-138
Author(s):  
I. N. Kuropyatnik
Keyword(s):  
Standard Sample ◽  
Atomic Emission ◽  
Elemental Content ◽  
Expanded Uncertainty ◽  
Term Stability ◽  
Relative Expanded Uncertainty ◽  
Long Term Stability ◽  
Atomic Emission Spectrometer

A study of the repeatability and long-term stability of elemental content measurements in a UG20 standard sample using a vacuum atomic emission spectrometer «Grand-Expert» was carried out on time scales of 10 min and 1 h. The values of standard and expanded uncertainty of the results of carbon, chromium, manganese, nickel and silicon determination which characterize the repeatability and long-term stability of measurements were calculated. It has been shown that a vacuum atomic emission spectrometer «Grand-Expert» provides determination of the content of alloying elements in steel with a relative expanded uncertainty of 1 – 2% whereas measurements of carbon content are characterized by higher relative expanded uncertainty of about 3%.

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