Use of redundant data to reduce estimation errors in geochemical speciation

View/Open
Cita com:
hdl:2117/27879
Document typeArticle
Defense date2015-04
Rights accessOpen Access
All rights reserved. This work is protected by the corresponding intellectual and industrial
property rights. Without prejudice to any existing legal exemptions, reproduction, distribution, public
communication or transformation of this work are prohibited without permission of the copyright holder
Abstract
Speciation is the process of evaluating the concentrations of all the species in a chemical system from equilibrium conditions and measured data such as total concentrations of components, electrical conductivity, pH, redox potential or gas partial pressure. It is essential for analyzing geochemical data and defining the chemical composition of waters for geochemical modeling problems like evaluating the chemical composition of evaporating, diluting, mixing waters or reactive transport. We present an algorithm that reduces estimation errors in chemical speciation calculations by means of the use of redundant data. Redundant data are measurements and assumptions that exceed the minimum required, and therefore are not strictly necessary, to speciate a water sample. The proposed method was compared with the classical speciation algorithm on two synthetic examples. Our results show that using redundant data improves speciation results reducing the estimation error between computations and measurements. In fact, the larger the amount of redundant data, the better the speciation in terms of errors of the estimated concentrations. (C) 2014 Elsevier Ltd. All rights reserved.
CitationDe Gaspari, F. [et al.]. Use of redundant data to reduce estimation errors in geochemical speciation. "Applied geochemistry", Abril 2015, vol. 55, p. 184-191.
ISSN0883-2927
Publisher versionhttp://www.sciencedirect.com/science/article/pii/S0883292714003047
Files | Description | Size | Format | View |
---|---|---|---|---|
15596147.pdf | 1,339Mb | View/Open |