Entwicklung und Anwendung eines neuartigen Analysenverfahrens zur Bestimmung von Quecksilber(II) mit Hilfe der FI-CVAAS

In the instrumental atomic absorption spectrometry (Cold Vapour AAS), the conventional use of sodium hydroxide for the quantitative determination of mercury was limited to its function as a stabilizing reagent for the hydrid forming reductant sodium tetrahydroborate. An unique property of hydroxyl ligands is the ability to coordinate divalent mercury (Hg2+) applying a synergetic effect of analyte specific selection and pH respectively pCl dependent speciation being capable to increase the sensitivity of the analytical procedure regardless of the inhibiting influence of a complexe matrix after solid phase extraction. Aim of the work is to demonstrate the decisive conditional improvement of an analytical standard setup by optimizing the physical and chemical parameters, creating an advanced systematic architecture concerning flow injection cold vapour systems and by combining the integrated parts of a reliable analytical routine with a new chemical substituting technique (Buffering and Donator Substituting Reagent, BDSR). The obtained results allow the quantification of Hg2+ in mineral matrices with organic components at ultra trace levels increasing the absolute sensitivity of the method from 220 pg to 26 pg, simultaneously reducing the amount of harmful process elements (toxic solutions) and realizing the determination of the natural background concentration (< 100 ng*g-1) of mercury in mineral solid specimens (soils, rocks). The evaluation of the developed analytical routine ensues by means of soil samples deriving from the southern planning region 10 (Bavaria). Apart from a pure quantification of the obtained analytical results of mercury(II) in terrestrial and semi-terrestrial soils, an analysis of the vertical distribution of the analyte in the soil profile and its spatial extension in the examinated area will be carried out.

Level thesis:degree_level

thesis.doctoral

Grantor dc:publisher

Ludwig-Maximilians-Universität

Year

2003

Author dc:creator

• Bohla, Andreas

Repository record source_url

https://edoc.ub.uni-muenchen.de/1719/

OAI identifier oai:identifier

oai:edoc.ub.uni-muenchen.de:1719