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Accurate calibration of mercury vapour measurements.

Brown, R J C; Brown, A S (2008) Accurate calibration of mercury vapour measurements. Analyst, 133 (11). pp. 1611-1618.

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Almost all measurements of mercury vapour, for example those to determine mass concentration in air, are currently ultimately traceable to the vapour pressure of mercury, usually via a bell-jar calibration apparatus. This allows a saturated concentration of mercury vapour in air to develop in a confined space in equilibrium with ambient conditions, from which a known mass of mercury can be removed for calibration purposes. Setting aside the uncertainty in the vapour pressure of mercury at a given temperature, the accuracy of vapour phase mercury determinations depends critically on fully understanding the operation and sensitivities of the mercury bell-jar apparatus. This paper discusses the thermodynamic and kinetic considerations that must be taken into account when using the bell-jar apparatus, provides the theoretical basis for understanding the operation of the bell-jar, and presents experimental data demonstrating the systematic biases which may be obtained when the bell-jar is used incorrectly. Best practice solutions for mercury vapour calibrations using the bell-jar are proposed.

Item Type: Article
Keywords: Mercury vapour, calibration, ambient air, uncertainty, bell-jar
Subjects: Analytical Science
Analytical Science > Trace Analysis and Electrochemistry
Last Modified: 23 Jul 2018 13:19
URI: http://eprintspublications.npl.co.uk/id/eprint/4241

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