Preparation of Sample- Oven dry the soil sample between 75 ºC and 80 ºC.
- Sieve the sample using a 2 mm mesh sieve, crush particles other than stone to pass through the sieve.
- Divide this material to obtain a representative sample of around 60 grams.
- Place this sample in a porcelain mortar and grind using a pestle until the material passes through a 0.425 mm sieve.
- Oven dry the soil sample between 75 ºC and 80 ºC and store in a dessicator to cool.
- Weight out approximately 50 grams of this material, noting its weight to two decimal places.
- Pour this sample into a shaker bottle, add 100 ml of distilled water and stopper tightly.
- Place the bottle on the bottle roller and run the machine for 16 hours.
- Filter the soil suspension into a clean dry flask through a suitable filter papaer ( e.g. Whatman No .5) on the Buchner funnel.
- Using a pipette, draw off 25ml of this solution and place in a suitable beaker.
- Add distilled water to the beaker to make up to 100ml.
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