Phosphate Test Kit - RXSOL-62-5520-001




Phosphates are water softening chemicals. Phosphate dosing is one of the way of avoiding corrosion in boiler. They react with the alkalinity of boiler water forming an insoluble substance or sludges which can be disposed by blow down continuously or periodically through the bottom of the boiler.

Depending on soft and hardwater Phosphates should be added to maintain a residual of 30 - 60 ppm in boiler water. Phosphate testing of a boiler sample is done by filtering out the phosphate precipitate already formed. To assure that the calcium + phosphate reaction goes to completion, there must be at least 20 ppm excess phosphate in the boiler. If phosphate rises over 60 ppm, it can contribute to boiler carryover.

To a small extent, phosphate also helps prevent boiler corrosion by forming a protective iron phosphate coating on the boiler metal.

Testing Procedure :

A Quantitative method to determine the amount of phosphate present in samples such as boiler feed water is as follows:

  • Rinse a clean test tube with water being tested.

  • FilI the test tube with 2.5 ml of water to be tested (to the line on the tube).

  • Holding the bottle vertically, add 20 drops from Rxsol TK LP1 solution. Cap the test tube and shake vigorously for 5 seconds.

  • Flow, holding the bottle vertically, add 5 drops from Rxsol TK LP2 Test Solution . Note: Rxsol Tic LP2 contains a very thick solution and may require increased pressure to release drops.

  • Cap and shake the test tube vigorously for 5 seconds.

  • Wait 3 minutes for color to develop. Rinse the 10 ml glass jar with above solution & fill it up to 10 ml mark.

  • Place the glass test jar on colour card & match with various shade of colour .

  • Read the test results by comparing the color of the solution to the appropriate Phosphate Color Card (choose either Freshwater or Saltwater). The tube should be viewed in a well light area against the white area of the card. The closest match indicates the ppm (mg:L) of total phosphate (PO43-) in the water sample. Rinse the test tube with clean water after use.

Tech Spec


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