1. Analytical Lab Essen, Evonik Goldschmidt, 1987, Inductively Coupled Plasma Analysis (ICP) Traces%: As 0.015, Bi 0.026, Pb 0.013, Cu 0.019, Sb 0.009, Fe 0.009, Ni 0.001.
2. Analytical Lab Essen, Evonik Goldschmidt, 2003/5, GC/MS Analysis after trimethylsilylation.
3. Analytical Lab Essen, Evonik Goldschmidt, 2004, Disintegration: HCl/ HF; ICP Analysis.
4. Analytical Lab Essen, Evonik Goldschmidt, 2005, ICP Analysis.