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Alkalinity Test Kit

ALKALINITY TEST KIT has been engineered to detect CaCO 3 salt content, expressed in parts per million (ppm), in boiler water systems. The test results obtained enable us to determine the necessary quantity of ALKALINITY CONTROL, required to regulate the water properties, as these must be adjusted sometimes, to maintain the boiler’s efficient and effective operation.

Test Kit Contents

A. Accessories

  • One piece of 1 ml graduated plastic syringe with a tip.
  • One piece of 5 ml graduated plastic syringe with a tip.
  • One piece of 5 ml marked plastic vial.

B. Reagents

  • Two pieces of 85 ml bottles Reagent 1 solution.
  • One piece of 24 ml bottle Reagent 2 solution.
  • One piece of 24 ml bottle Reagent 3 solution.
Order № Unit (in set) Container
700101 1 Plastic Case


A. Pre-treatment

Before testing, samples must be cooled to 25°C by passing them through a cooler.

B. Instructions

For positive p-value

  • Use the 5 ml plastic syringe to fill the marked plastic vial with 5 ml of the water sample.
  • Add two drops of reagent 2 and shake lightly until the solution turns reddish rose. If it remains colorless, determine the positive m-value according to the following positive p-value test instructions.
  • If the solution has turned reddish rose, fill the 1 ml plastic syringe by drawing 1 ml from Reagent 1 solution up until the lower edge of the syringe levels with scale graduation mark 1.0.
  • Lightly shake the sample solution and drop-wise add reagent 1, with the filled syringe, until the color changes to colorless.
  • Read off the level of Reagent 1 used in the syringe and convert to ppm using the Test Results Evaluation Table below.

For positive m-value

  • Keep the water sample from the second step of the positive p-value test. Add 2 drops of Reagent 3 and shake lightly. The solution should turn blue. If it turns orange, there is no acid capacity in the water. Alkaline capacity can be determined.
  • Titrate as described in the positive p-value test, until the color changes to gray and then to orange.
  • Read off the level of Reagent 1 used in the syringe. Calculate the m-value alkalinity as ppm CaCO 3 = (ml Reagent 1 from test 1 + ml Reagent 1 from test 2) X 600.

C. Additional information

In order to be able to measure erratic changes of the pH values, which do not occur at the point of neutrality (pH 7), suitable indicators have to be used for the pH intervals 0-7 and 7-14. The use of such indicators explains the use of the positive m and p value tests.

A positive m-alkalinity value should be lower than twice the positive p-alkalinity value. If not, add 1 liter of ALKALINITY CONTROL and repeat the test after three hours.

Test Results Evaluation Chart

ml of Reagent 1 0-0,05 0,06-0,12 0,13-0,15 0,16-0.25 Over 0.25
ppm as CaCO 3 0-30 40-70 80-90 100-150 Over 150
Dosage per ton of Water 0,15 lt 0,10 lt 0,05 lt Satisfactory Blowdown


  • For samples less than 100 ppm as CaCO 3 , supply the system with the prescribed dosage of ALKALINITY CONTROL as in the chart above.
  • For samples greater than 150 ppm as CaCO 3, perform blowdown and supply the system with the initial dosage of ALKALINITY CONTROL prescribed below.

Initial Dosage

ALKALINITY CONTROL: 150 ml/ton of fresh water

After initial dosage is introduced into the system, perform the test twice between every 3-6 hour interval; afterwards test daily, until stabilization of system has been achieved. Thereafter, tests may be conducted in intervals of two to three days or so.

Test Results Follow Up

Once the test results are obtained, they must be recorded in the MARICHEM BOILING WATER TREATMENT LOG BOOK. Note that, at the end of every month, the vessel’s headengineer must submit these Log Books to the owner company, who in turn should submit Log Books to MARICHEM MARIGASES Worldwide Services for further evaluation and technical instructions.