testingmethodsop

  SOP For Total Hardness in Water and waste water EDTA Titrimetric method Purpose: The purpose of this protocol is to provide guidelines for analysis of Total Hardness in Water. Principle of method: EDTA and it's sodium salts from a chelated solution complex when added to a solution of certain metal actions, if a small amount of dye such as Eriochrome Black T is added to an aqoeous solution containing calcium and magnesium ions at a pH of 10+0.1 to 10-0.1, the solution becomes winr red. When titrated with EDTA , the magnesium and calcium will be complexed, and when all of the  and  has been complexed the solution turns from wine red to Blue.      To   Instrument/Equipment: The following items are necessary to perform the analysis of Total Hardness in Water; pH Meter Burette – 50 ml capacity Glass Wares Reagents/Chemicals: All the chemicals should be of Analytical Reagent Grade. Distilled Water Buffer Solution – Dissolve 16.9 g of Ammonium Chloride...