title: Quality assurance challenge 3.
authors.affiliation: Institute of Inorganic and Analytical Chemistry, Friedrich Schiller University, Lessingstrabe 8, 07743, Jena, Germany. c7rema@uni-jena.de
authors.forename: Manfred
authors.initials: M
authors.lastname: Reichenbächer
authors.forename: Jürgen W
authors.initials: JW
authors.lastname: Einax