title: Solution to quality assurance challenge 2.
authors.affiliation: Friedrich-Schiller-University, Institute of Inorganic and Analytical Chemistry, Lessingstrasse 8, 07743, Jena, Germany. juergen.einax@uni-jena.de
authors.forename: Jürgen W
authors.initials: JW
authors.lastname: Einax
authors.forename: Manfred
authors.initials: M
authors.lastname: Reichenbächer