BS ISO 11464:2006 pdf download.Soil quality —Pretreatment of samples for physico-chemical analysis.
Ills recommended that pretreatment of soil matenal always be performed in a room used only for this pixpose and remote from locations where analytical measurements are made.
NOTE If the sample has a dust-like consistency, part of it may be lost, and this niey alter its physico.chemical properties.
5.2 Sample descrtplion
Examine me sample as recerved and record the description includwig details of extraneous matter, remains of vegetation, and other noticeable or relevant features.
5.3 Drying
53.1 General
Dry the complete sample in air or in a ventilated drying oven from which the moist air is removed or in a freeze dryer. Depending on the chosen method of drywig, follow the procedure set out in 5.32,5.3-3 or 5.3.4. Dry until the loss in mass of the soil sample is not larger than 5% (mass fraction) per 24 h. After the drying process has been completed, determine and record the total mass of the dried sample.
To accelerate the drying process. break down the size of larger aggregates (larger than 15 mm) during the process. When samples are dried In air, crush them lightly by hand usrg a wooden hammer or a mortar and pestle, taking great care to avoid contanlwiation. When samples are dried in an oven, remove them temporarily from the oven and treat them I, the same way. This procedure also makes it easier to separate the particles larger than 2 nv’n.
Freeze-drying has the advantage that the sample to be dried rarely dries Into clods: it usually breaks up Into parts,
The drying time depends on the type of material the thickness of the layer, the initial moisture content of the material and of the air, and on the rate of ventilation. In a drying oven, the drying time for sandy soils is usually not more than 24 h and for clay soils more than 48 h. For soils containing a large proportion of fresh organic matter (e.g plant roots, etc.), 72 h to 96 h may be required.
NOTE If the sample has a dust-like consistency, part of it may be lost, and this niey alter its physico.chemical properties.
5.2 Sample descrtplion
Examine me sample as recerved and record the description includwig details of extraneous matter, remains of vegetation, and other noticeable or relevant features.
5.3 Drying
53.1 General
Dry the complete sample in air or in a ventilated drying oven from which the moist air is removed or in a freeze dryer. Depending on the chosen method of drywig, follow the procedure set out in 5.32,5.3-3 or 5.3.4. Dry until the loss in mass of the soil sample is not larger than 5% (mass fraction) per 24 h. After the drying process has been completed, determine and record the total mass of the dried sample.
To accelerate the drying process. break down the size of larger aggregates (larger than 15 mm) during the process. When samples are dried In air, crush them lightly by hand usrg a wooden hammer or a mortar and pestle, taking great care to avoid contanlwiation. When samples are dried in an oven, remove them temporarily from the oven and treat them I, the same way. This procedure also makes it easier to separate the particles larger than 2 nv’n.
Freeze-drying has the advantage that the sample to be dried rarely dries Into clods: it usually breaks up Into parts,
The drying time depends on the type of material the thickness of the layer, the initial moisture content of the material and of the air, and on the rate of ventilation. In a drying oven, the drying time for sandy soils is usually not more than 24 h and for clay soils more than 48 h. For soils containing a large proportion of fresh organic matter (e.g plant roots, etc.), 72 h to 96 h may be required.
