SOP FOR GLASSWARE CLEANING

I.                   PURPOSE

To describe the procedure for cleaning the glassware in the Quality control lab.

II.                SCOPE

This procedure is applicable to glassware in Quality Control department, , Unit-V.

III.             RESPONSIBILITY

Assistant, Executive – Quality Control

IV.             ACCOUNTABILITY

Incharge – Quality Control

V.                PROCEDURE

1.0         After completion of the analysis, QC chemist should set aside the used glassware 

             and inform for washing.

2.0         While transferring and cleaning, proper care should be taken to avoid breakage.

3.0         Collect the glassware which is to be cleaned, in a plastic tub and transfer to washing    

             area.

4.0         Clean the used glassware with tap water.

5.0         Soak the glassware in 1% neutral pH soap solution for 10 to 15 minutes.

6.0         To remove persistent impurities, use suitable solvent.

7.0         Rinse with tap water, if glassware is not clean repeat step 5.0 and 6.0.

8.0         Finally, rinse the glassware with purified water.

9.0         Drain the water and keep the glassware for drying in the oven below 70°C (avoid drying   

             in the oven for a longer time).

10.0          After drying, remove the glassware from oven and store in respective areas (do not            use the glassware until it reaches the room temperature).

11.0          Gooch crucible

11.1           Fill the Gooch crucible with 10% Nitric acid and soak for sufficient period of    

             time.

11.2           Rinse with plenty of tap water.

11.3          Apply vacuum and wash the crucible with tap water.

11.4          Rinse 3 to 4 times with purified water and keep it in drier.

12.0         Silica and platinum crucible

12.1          Rinse the crucible with 10% nitric acid and then with tap water.

12.2          Again, rinse three to four times with purified water.

12.3          Ignite the crucible at 700°C temperature in a muffle furnace.

12.4          Switch off the muffle furnace.

12.5          Before taking out the crucible from muffle furnace, ensure that the temperature   

            is below 100° C. 

12.6          Take out the crucible and place it in the desiccator immediately.

VI.       REVISION SUMMARY

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