How to check caustic Alkalinity of water sample.

How to check caustic Alkalinity for boiler water sample.

Method

\ Firstly 10ml water sample take.

\ Then add 1.5ml {10%} barium caloride solution (bacl).

\ Then shake it well

\ Then add white PPTS (pyridinium p toluenesulfonate) 

\ Then add phenophlene indicator

\ Then Triturate it against 0.1N HCL solution

Formula 

ML used ×500.  = caustic Alkalinity ppm