Brown, R J C; Milton, M J T; Brewer, P*; Wielgosz, R I (2001) High accuracy titrimetry with application to HCl. NPL Report. COAM 5

Text COAM5.pdf Download (5MB)

Abstract

Three independent methods of potentiometric titration using tris (hydroxymethyl) methylamine, potassium hydroxide and silver nitrate have been developed with full uncertainty budgets. We estimate the uncertainty of each of these methods to be approximately 0.1% (relative to value) (k=2). These methods have been used for the accurate determination of the molality of HCl in solution as part of the international comparison CCQM-P19. The report also highlights the limitation imposed on the potentiometric titration method by the 'dilution effect' which is particularly significant for volumetric methods operating at low concentrations.

Item Type:	Report/Guide (NPL Report)
NPL Report No.:	COAM 5
Keywords:	potentiometric, titration, solution chemistry
Subjects:	Analytical Science
Last Modified:	02 Feb 2018 13:17
URI:	https://eprintspublications.npl.co.uk/id/eprint/2129