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Soluciones quimiométricas para optimizar el análisis de parámetros químicos en aguas

by Tortajada Genaro, Luís Antonio

Abstract (Summary)
SUMARY

This thesis project "Chemometric solutions for optimising the analysis of chemical parameters in waters" was performed with the general aim of proposing some analytical solutions in water quality analysis. The variability of samples is wastewater, groundwater, drinking, tap, river, ditch water, coastal, estuarine and harbour water. The areas evaluated will be Valencia city area (Spain) and Tamar Estuary (Plymouth, UK). The selection of analytes was within the framework of the law, environmental context of studied areas, toxicity criteria, biological and analytical needs. The proposed methods have been based on the improvement of accuracy, precision and/or selectivity using different strategies. Different chemometric tools have been described in order to optimise the analysis of water chemical parameters. This tools have included statistical test, classification methods or calibration methods, different models, approaches, data pre-treatment or variable selection criteria. The analysis of phenols involves the use of preconcentration cartridge and generalised H-point standard addition method (GHPSAM) and spectrophotometry methods (with or without derivatization). The analysis of amines was based in the o-phthaldehyde-N-cysteine derivatization. Some procedures for the formation and kinetic study, stabilisation of derivative and for the determination in sample were proposed. The analysis of chromium (VI) was achieved by direct spectrophotometry using GHPSAM. This strategy allows the modelling of the system, the determination of CrO42- and HCrO4- or the determination of total Cr. The univariate analysis of chromium involves a chemiluminescence method. The influence of storage protocol, reaction conditions an prereduction step and the design of a new detection cell were studied. The multivariate analysis of Cr was to obtain the calibration model and the conditions of standardisation in the linear and non-linear interval. The simultaneous analysis of Cr and Co involves a multicommutational flow system using a switching manifold design and the use of chemometric tools. The analysis of phosphate was based in a sequential injection manifold and the reaction of molybdate-tin (II) chloride-phosphate. Different sampling campaigns were also compared. A summary of interested subjects, the used chemometric strategies and advantages of proposed methods was evaluated. This European thesis was written in Spanish and English. Luis Antonio Tortajada Genaro

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Bibliographical Information:

Advisor:Campings Falcó, Pilar; Bosch Reig, Francisco

School:Universitat de València

School Location:Spain

Source Type:Master's Thesis

Keywords:química analítica

ISBN:

Date of Publication:12/11/2002

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