1. Total digestion of silicate containing matrices (plant, soil, sludges) using a pressure ashing device with PFA-vessels;Schramel;Fresenius J. Anal. Chem.,1996
2. Voltammetric Determination of Cd, Cu, Co, Ni and Pb in Milkpowder and Other Biological Materials with Special Regard to the Ashing Method;Hasse;Mikrochimica Acta,1983
3. Destruction of organic materials by pressurized microwave digestion;Schramel;Fresenius J. Anal. Chem.,1993
4. Anwendung voltammetrischer Verfahren zur Spurenelementbestimmung in klinischen Proben: „Eine kritische Bewertung der Möglichkeiten und Grenzen”;Schramel;Lab.med.,1993