Matter
- Name
- Na-exchanged montmorillonite SCa-3 size-fraction <1 µm
- Family
- mineral
- Database
- Experimentalists
- Parent matter
- Montmorillonite SCa-3
- Origins
- natural terrestrial
- Provider
- CML laboratory
- Local reference code
- NaSCa3_LSD
- Body name
- Earth
- Preparation
- extracted components
- Method
- Monominerallic sample extracted by removal of carbonates, organics, and Fe-(oxy-)hydroxides by a sequence of acetic acetate buffer, hydrogen peroxide, and buffered sodium dithionite treatments, followed by washing in deionized water, size separation by centrifugation, and subsequent dialysis in deionized water and drying at 60C. Sample was stored at room temperature and relative humidity
- Phase type
- solid
- Component type (group)
- mineral (silicate mineral)
- Texture
- aggregated grains
- Type of porosity
- particulate
- Texture
- clay-like
- Grain sizes
-
Grains Size min Size max Size median Size width Size mass fraction Grain shape #1 1.0 ${\mu}m$ 1.0 $\pm$ 0.05 platy - Size method
- Size-fraction was separated in a centrifuge (Stoke's Law) but not verified
- Title
- Purification, size separation, and cation exchange
- Matters
- Materials
- Matter
- Na-exchanged montmorillonite SCa-3 size-fraction <1 µm (this matter)
- Processing steps
-
Step Date Type Process Changes #1 2013-03-01 mechanical Dry sieving at 400µm mesh Removal of coarse fraction (above 0.4 mm #2 2013-03-01 chemical Reaction of 30 g of a sample with 150 ml of hydrogen peroxide for 30 min at 40C. Repeated 3 times. Removal of organic matter #3 2013-03-02 chemical Reaction with 200 ml of Na-acetate buffer (ph 4.5 to 5.5) at 90C for 30 min Removal of carbonates #4 2013-03-03 chemical Reaction with 2g sodium dithionite in 200 ml of sodium citrate - sodium bicarbonate solution at 75C Removal of free Fe(hydro)oxides #5 2013-03-04 fluid physical Washing with deionized water Removal of excess adsorbed cations and anions #6 2013-03-05 mechanical centrifugagion in deionized water Separation of <1 micron fraction according to Stoke's Law #7 2013-03-06 fluid physical Dialysis in deionized water. Water was changed until conductivity of water dropped below 1 microsiemens Removal of excess adsorbed cations and anions #8 2013-03-10 thermal Drying in an oven at 60C Drying of a sample #9 2013-03-12 mechanical Crushing in an agate mortar Disintegration of a sample in order to create powder