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Please use this identifier to cite or link to this item: http://hdl.handle.net/10204/834

Title: Preparation, assay and certification of aqueous ethanol reference solutions
Authors: Archer, M
De Vos, BJ
Visser, MS
Keywords: Ethanol
Certified reference materials
Traceability
Titrimetry
Gravimetry
Primary methods
Issue Date: Apr-2007
Publisher: Springer
Citation: Archer, M, De Vos, BJ and Visser, MS. 2007. Preparation, assay and certification of aqueous ethanol reference solutions. Accreditation and Quality Assurance, Vol. 12(3-4), pp 188-193
Abstract: Internationally, certified ethanol reference materials are required to calibrate breathalysers and blood-alcohol measurement instruments. The CSIR National Metrology Laboratory of South Africa provides certified aqueous ethanol solutions with traceability to the SI. Ethanol solutions in the concentration range 10 mg/100 g to 20 g/100 g are prepared gravimetrically by mixing ethanol and reagent quality water. To verify the concentration of the ethanol it is oxidized to acetic acid with potassium dichromate in the presence of sulphuric acid. The unreacted potassium dichromate is back-titrated with sodium thiosulphate. The method utilizes gravimetry and titrimetry, which are both primary methods. This paper addresses aspects of ethanol-certified reference materials that have not been previously published: traceability, stability of unpreserved ethanol solutions, homogeneity, quality control measures and the effect of reproducibility on the measurement uncertainty
Description: http://www.springerlink.com/content/k61xlj60250h328p/?p=b7ac90323ec2460985dfcd591f22e41e&pi=11
URI: http://hdl.handle.net/10204/834
ISSN: 0949-1775
Appears in Collections:Metrology
General science, engineering & technology

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