Ash/Moisture Content Determination ~ Instant Motivation Hub (IMH)


Wednesday, 12 April 2017

Ash/Moisture Content Determination

Ash content determination
Ash content of material represents inorganic residue remaining after destruction of organic matter, which is generally considered equivalent to the mineral content. However, high ash content in some cases suggest the presence of adulterants.


Procedure

  • The weight of the empty crucible is weighed with lid and recorded and then 2g of the sample is turned into the crucible.
  • The sample is heated until it turns to ashes. The weight of the ash content in the crucible is taken again and then subtracted from the initial weight.


Moisture content determination
Procedure

  • The weight of the empty crucible is weighed with lid and recorded and then 2g of the sample is turned into the crucible.
  • The sample is heated in an oven until it is dried and the weight of the ash content in the crucible is taken again and then subtracted from the initial weight.


Fibre content determination in plant
It is the organic residue comprising largely cellulose together with a little lignin, which remains after a sequential digestion of the sample with dilute HCl and NaOH under standardized conditions.

Procedure
Acid Digest

  • 100ml of the HCl is turned on the pretreated sample in a filter paper and the filtrate is discarded.
  • 100ml of hot distilled water is used to filter the residue.


Basic Digest

  • 100ml of the NaOH is turned on the same sample in the filter paper and the filtrate is discarded.
  • 100ml of hot distilled is used to filter the residue.


Using methanol

  • 100ml of the methanol is turned on the same sample in the filter paper and the filtrate is discarded.
  • The residue is turned into a crucible
  • The weight of the crucible plus lid to be used for heating is taken
  • The residue in a crucible is heated until it turns to ashes.
  • The weight of the crucible containing the fibre content is taken and then subtracted from the initial weight


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