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Comments on temperature calibration and uncertainty estimate of the vibrating tube densimeter operated at atmospheric pressure
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SYSNO ASEP 0558885 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Comments on temperature calibration and uncertainty estimate of the vibrating tube densimeter operated at atmospheric pressure Tvůrce(i) Prokopová, Olga (UT-L)
Blahut, Aleš (UT-L) RID, ORCID
Čenský, Miroslav (UT-L)
Součková, Monika (UT-L) RID, ORCID
Vinš, Václav (UT-L) RID, ORCIDCelkový počet autorů 5 Číslo článku 106855 Zdroj.dok. Journal of Chemical Thermodynamics. - : Elsevier - ISSN 0021-9614
Roč. 173, October (2022)Poč.str. 11 s. Forma vydání Tištěná - P Jazyk dok. eng - angličtina Země vyd. GB - Velká Británie Klíč. slova calibration ; density ; uncertainty estimate ; vibrating tube densimeter ; viscosity effect Vědní obor RIV BJ - Termodynamika Obor OECD Thermodynamics CEP GA19-05696S GA ČR - Grantová agentura ČR GA22-03380S GA ČR - Grantová agentura ČR Způsob publikování Omezený přístup Institucionální podpora UT-L - RVO:61388998 UT WOS 000829297100001 EID SCOPUS 85133551850 DOI 10.1016/j.jct.2022.106855 Anotace Vibrating tube densimeter (VTD) is a popular instrument providing a quick and accurate measurement of density for large variety of liquids and gases. Sensitive commercial instruments have resolution of down to 0.001kg⋅m3 and their accuracy is declared to reach 0.007kg⋅m3 under ideal conditions at temperatures close to ambient.However, the uncertainty of the obtained data can be significantly higher when it comes to measurements over wider temperature range. We present calibration procedure for a commercial borosilicate glass VTD (namely Anton Paar DMA 5000 M) over the temperature range from 275 to 363K together with an uncertainty analysis.The approach is similar to that of Fritz et al. [J. Phys. Chem. B 104 (2000) 3463] when the density can be obtained from the relative oscillation period PQ, damping difference ΔD0 and calibration parameters A, B,V1, and V2 as ρ = A(1 + V1ΔD0 + V2ΔD20 )PQ2B. Temperature dependencies of the calibration parameters A and B were determined from a series of precise measurements with ultrapure water and dry air correlated to the densities calculated from the IAPWS-95 equation of state for water and the IAPWS G8-10 guideline for humid air. The calibration procedure was verified on measurements with toluene, ethanol, ethylene glycol, and glycerol. A detailed analysis of the uncertainty budget resulted in the standard uncertainty around 0.030kg⋅m3 for typical low-viscosity samples. In case of highly viscous liquids such as low-temperature ethylene glycol or glycerol, the uncertainty can reach 0.060kg⋅m3 or even 0.14kg⋅m3, respectively, at the dynamic viscosity exceeding 50mPa⋅s. Other influences are also discussed, such as the relation between fluid viscosity and damping, the isotopic composition of the calibration water, the measurement procedure covering VTD cleaning and filling, and the effect of water contained in samples. Pracoviště Ústav termomechaniky Kontakt Marie Kajprová, kajprova@it.cas.cz, Tel.: 266 053 154 ; Jana Lahovská, jaja@it.cas.cz, Tel.: 266 053 823 Rok sběru 2023 Elektronická adresa https://doi.org/10.1016/j.jct.2022.106855
Počet záznamů: 1