Modern modifications of gravimetric analysis use advanced techniques and instruments to make the process faster, more accurate, and easier compared to classical methods. Some of these are:
- Filtration using membranes or microfilters:
- Instead of traditional filter paper, fine membrane filters help separate precipitates more efficiently.
- Centrifugation:
- Precipitates are separated using a centrifuge, which is faster and reduces loss of material.
- Electrogravimetry:
- The substance is deposited on an electrode by electrolysis and weighed.
- Example: Determining silver or copper.
- Thermogravimetry (TGA):
- Measures weight changes on heating to study decomposition, moisture, or oxidation.
- Precipitation with co-precipitation methods:
- Uses carrier ions to improve the collection of very fine precipitates.
- Automated gravimetric analyzers:
- Instruments automate weighing, separation, and drying, reducing human error.
In short:
Modern gravimetric analysis uses filters, centrifuges, electrolysis, heating, or automation to make the method faster, precise, and more efficient.