Loss on drying
Loss on drying (LOD): The moisture in a solid can be expressed on a wet-weight or dry-weight
basis.
On a wet-weight basis, the moisture content of a
material is calculated as a percentage of the weight of the wet solid whereas
on the dry-weight basis, the moisture content is expressed as a percentage of
the weight of the dry solid.
The
term ‘loss on drying’ commonly referred to as ‘LOD’ is an expression of
moisture content on a wet-weight basis, which is calculated as follows—
%
LOD = 
´ 100
´ 100
Moisture content: The moisture in a wet-solid is calculated on a
dry-wt. basis. This value is referred to as moisture content (MC)—
%
MC = 
´ 100
´ 100
Example: If exactly 5gm of moist solid is brought to
a constant dry-weight of 3gm.
\ MC = 
´ 100 = 66.7%
´ 100 = 66.7%
Whereas,
LOD = 
´ 100 = 40%
´ 100 = 40%
LOD values can vary in any solid-fluid mixture from
slightly above 0% to slightly below 100%, but the MC values can change from
slightly above 0% and approach in infinity.
5% moisture means a compound with 100gm (bone dry
comp) contain 5gm moisture.
Bone drying --> completely free from moisture.
Loss on drying
Reviewed by M H Islam
on
8:26 AM
Rating:
Reviewed by M H Islam
on
8:26 AM
Rating:
