Determination of Effect of Material on Water Quality ( Method of Extraction )

Test Specimen

You must get three test specimens of pipe. Each test specimen must taken from different pipes randomly. Each test specimen must contain approximately 500mm in length.

Procedure

• First of all you must wash every test specimen using tap water for a period of 6 hours. 
• The pH value of water must be 7-8. 
• Fit a stopper at one end of the each test specimen. 
• Each stopper must contain with a Glass Stop-cock. 
• Then stand the specimen in a vertical position and stop-cock at the bottom opened to give  the desired flow of the water through the specimen. 
• Make sure stoppers and other materials used for sealing are not contain materials which may cause contamination. 
• The water shall be passed through the specimen at approximately 50mm/s. 
• Because the specimen must kept fully filled with water. 
• You must add sufficient water to overflow at all times.

• After washing, you must fill each specimen with the fresh solution of the distilled water acidified to a pH value of  4.5 - 4.6 by bubbling a current of CO2 through it. 
• To fill that solution seal a one end with a material that doesn't contain any toxic substances. 
• After fill the solution, seal other end using above material.

• After that you have to maintaining the specimen at room temperature for 48 hours.
• The solution should decant into a suitable container for analysis as the First Extraction.
• Then you must repeat the procedure for second and third time.
• Then retain these sample for the determinations of the amounts of metal and other toxic substances as second and third extractions.

After all of that you can analyse First and Third Extraction for Lead.

And also you can analyse The Third Extraction for Dialkyl Tin as Tin ( C4 and above ).

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