General Test Procedure Limit Test Iron

 

1. Purpose
   1. This procedure is applicable to all incoming Raw materials.
2. Apparatus
   1. Nessler Cylinder
3. Reagents
   1. 20%w/v citric acid solution
   2. Thioglycollic acid AR
   3. Ammonia solution
   4. Iron Standard Solution (20ppm Fe): Dissolve 346mg of ferrous ammonium sulphate in 10ml of 1M sulphuric acid and dilute to 100ml with water. Dilute 10ml of the solution to 100ml with water. Each ml of the resulting solution contains 20ppm of Iron
4. Procedure
   1. Test Preparation:
      1. Dissolve the specified quantity of substance in sufficient water and transfer to 50ml nessler cylinder. Add 2ml of 20%w/v citric acid solution, 0.1ml of Thioglycollic, mix and make alkaline with ammonia solution, and dilute to 50ml with water. Stir with glass rod and allow to stand for 5 minutes.
   2. Standard Preparation
      1. Take 2ml of Iron standard solution (20ppm Fe) in a 50ml nessler cylinder. Add 2ml of 20%w/v citric acid solution, 0.1ml of Thioglycollic acid, mix and make alkaline with ammonia solution and dilute to 50ml with water. Stir with glass rod and allow to stand for 5 minutes.
   3. Observation
      1. The opalescence produced in test solution is not more intense than that obtained in standard solution.
5. Reference
   1. None
6. Revision History

Revision No.	Details of Changes	Reason for change
00	New GTP	NA

End of Document

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