STP FOR THE DETERMINATION OF LOSS ON DRYING BY OVEN DRYING METHOD IN CHOORNA/KVATHA CHOORNA

1.0 SCOPE

This standard testing procedure is suitable for the determination of Loss on drying by oven drying method.

2.0 PURPOSE

The purpose of the document is to establish a method for determination of Loss on drying by Oven drying method.

3.0 RESPONSIBILITY

The expert and trained chemist are responsible for following this procedure. The technical manager is responsible for implementing this procedure.

4.0 REQUIREMENTS

4.1 Apparatus

4.1.1 Analytical Balance.

4.1.2 Hot air oven.

4.2 Glassware

4.2.1 Petri dish.

4.3 Reagen. N.A.

5.0 PROCEDURE

5.1 Dry the evaporating dish for 30 minutes under the same conditions to be employed in the determination.

5.2 Place about 5 to 10 g of the sample accurately weighed in a tared evaporating dish.

5.3 Put the sample in a hot air oven previously maintained at 1050C for 3 hours.

5.4 Take the sample out of the oven and put it in the desiccators with the lid on.

5.5 Continue the drying, cooling, and weighing at half an hour intervals until the difference between two successive weighings corresponds to not more than 0.25 percent.

5.6 Record the lower mass obtained and calculate the loss on drying.

6.0 CALCULATION                                                                    

                                  M₁-M₂                           

                           Loss on drying, %(w/w) = --------------×100

                                                                         M₁-M                        

               Where,

                              M = Weight of Empty dish

                              M₁= Weight of dish + sample

                              M₂=  Weight of the dish with sample after drying

6.1. ATTACHMENTS

Appendix-1: Flow low chart for loss on drying by Oven Drying Method.



7.0 REFERENCES

API Part 1; Volume VIII, first Edition-2011.

 END OF THE DOCUMENT

You may like to read these links: 

1. List of All SOPs and Documents for the Chemistry Laboratory

2. List of All SOPs and Documents for Quality Control

3. List of All SOPs and Documents For Quality Assurance Dept.

4. List of SOPs and Documents Required to Achieve NABL Accreditation 

5. List of All SOPs and Documents for Laboratory Instruments and Equipment

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