Division 3

The complete sample is to be homogenised (the addition of a known amount of water is optional). Depending upon the size of the blender/macerator/chopper used, one or more individual units may be combined for homogenisation purposes. Blending may be aided by freezing and chopping the units before homogenisation is carried out. It must be demonstrated that the homogenisation process used achieves complete homogenisation. Thorough homogenisation is essential for maximum extraction and recovery of nitrate. Samples shall be treated identically in this way irrespective of whether they have been obtained from the field or from retail.