Total digestion system

With this system the complete digestion of geological samples is possible by means of HF / HClO4. By ICP-MS and ICP-OES, respectively the element concentrations in the digestion solutions can be determined.

Equipment

Sample preparation

Details

Equipment

Total digestion system DAS (PicoTrace, Bovenden, Germany) for the simultaneous digestion of up to 32 samples. Vessels made from PTFE-TFM are available for the addition of up to 10 mL of acids.

Sample preparation

For total digestion samples must be dried and ground (minimum mass: 500 mg; if less material is available please discuss in advance). We suggest to ground larger masses to guarantee highest possible representativity of the sample.

Details

(modified from Grawunder et al., 2014):

100-150 mg of each ground sample were digested in a pressure digestion system (DAS, PicoTrace). The ground material was put in TFM vessels and 2 mL 65% HNO3 (subboiled), 3 mL 40% HF and 3 mL 70% HClO4 (both suprapur, Merck) were added. This mixture was then heated up to 180°C within 6 h. After maintaining the temperature for 12 h the samples were cooled down. For evaporating the acids, the system was heated up again to 180 °C for 4-5 h in a special evaporating hood maintaining the temperature again for 14 h. The remaining solids were dissolved again after adding 2 mL HNO3 (p.A. Merck, subboiled), 0.6 mL HCl (suprapur, Roth) and 7 mL pure water (GenPure UV-TOC, Thermo Fisher Scientific) at 150°C within 8 h. The cooled samples were transferred to calibrated 25 mL flasks (PMP, Vitlab) and replenished to 25 mL by addition of pure water.

Contact

Dirk Merten (Head of lab)

Telephone: +49 3641 / 948616
E-Mail: dirk.merten@uni-jena.de

Ines Kamp

Telephone:
+49 3641 / 948649, +49 3641 / 948653
E-Mail: ines.kamp@uni-jena.de