Stability Monitoring of Electrolytic Conductivity Reference Materials Under Repeated Use Conditions by the Primary Measurement Method

Author(s)

Cunha, Kleiton da Cruz ^[1] ; Pardellas, Leonardo da Silva ^[1] ; Gonzaga, Fabiano Barbieri ^[1]

Affiliation

^[1] Natl Inst Metrol Qual & Technol INMETRO, Ave Nossa Senhora das Gracas 50, BR-25250020 Duque De Caxias, RJ - Brazil

• Document type: Journal article
• Source: JOURNAL OF SOLUTION CHEMISTRY; v. 49, n. 3 MAR 2020.
• Web of Science Citations: 0

Abstract

This work presents the results from stability studies for several electrolytic conductivity (EC) reference materials submitted to repeated use conditions, as required by the last version of the ISO 17034 standard. Eight batches of reference materials, composed of water or water/n-propanol and HCl or KCl (at different concentrations), were studied, with nominal EC values ranging from 5 to 12,825 mu S center dot cm(-1). The materials were submitted to a simulation of repeated use, with the manipulation of bottles once a week and their storage under refrigeration with air gaps inside them. They were then analyzed once a month by the EC primary measurement method. The measurement results were evaluated to check for deviations from conventional long-term stability monitoring and for variation trends using normalized error and linear regression statistical tests. The results indicated that the repeated use simulation caused deviations in the EC for the 100 and 500 mu S center dot cm(-1) reference materials and variation trends in the EC for the 5000 and 12,825 mu S center dot cm(-1) reference materials. From the results, the uncertainty related to stability monitoring under repeated use conditions was calculated for each reference material. (AU)

• FAPESP's process: 08/57808-1 - National Institute of Advanced Analytical Science and Technology
• Grantee: Celio Pasquini
• Support Opportunities: Research Projects - Thematic Grants