Extraction method | Mass sediments, g | Mass reference materials, g | Volume solvent, mL |
Na2CO3-NaOH/Hotplate | 2.5 | 0.2 | 50 |
EDTA/Microwave | 2.5 | 0.1 | 50 |
EDTA/ThermoMixer | 0.5 | 0.02 | 4.5 |