Dissolved Ozone Test Kit

Ozone is used for the disinfection of swimming pool water, and in many other water treatment systems. In swimming pool water treatment ozone is normally introduced into the circulation system and then removed prior to the re-entry of the water to the pool. In other water treatment systems an ozone residual may be maintained in the water. In all cases accurate measurement of ozone residual is essential for the control of the system or to ensure that the ozone has been removed.

The DPD Ozone method provides a simple means of measuring ozone residuals up to a level of 1 mg/l. Other disinfectants such as chlorine and bromine are frequently used in conjunction with ozone. Supplementary procedures are therefore provided for the separate determination of these residuals.

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1. Rinse a square test tube with sample leaving two to three drops of sample in the tube.
2. Add one DPD No 4 tablet, crush tablet and then fill the test tube with sample to the 10 ml mark. Mix to dissolve tablet.
3. Place the test tube in the KIT-OZ-01 and match immediately against the disc in the usual manner (see KIT-OZ-01 instructions).
4. The disc reading (Reading A) represents the ozone residual as milligrams per litre O₃.

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1.  
   1. Rinse a square test tube with sample leaving two to three drops of sample in the tube.
   2. Add one DPD No 4 tablet, crush tablet and then fill the test tube with sample to the 10 ml mark. Mix to dissolve tablet.
   3. Place the test tube in the Comparator and match immediately against the disc in the usual manner (see Comparator instructions).
   4. The disc reading (Reading A) represents the ozone residual as milligrams per litre O₃.