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Chlorine with liquid reagent

0.02 - 3 mg/l Cl2 a) Mark as favourite

Chlorine is the most popular and widely used of the disinfectants. The chlorination of water supplies, swimming pools and cooling tower waters are but a few of the everyday applications.

Free Chlorine (hypochlorous acid) reacts with Ammonia and certain Nitrogenous compounds to form Combined Chlorine. With Ammonia, the reaction produces chloramines which have very little disinfecting power, thus it is important to be able to determine the various fractions of Chlorine present at any one time.

DPD (NN Diethyl p Phenylene Diamine Sulphate) is the preferred reagent for the determination of Free, Combined and Total Chlorine. It is available in Tablet, Liquid and Powder form. A list of compatible instrumentation and test kits can be found below.

Total Chlorine can also be measured using a Potassium Iodide reagent. This can measure concentrations of up to 300 mg/l chlorine and is widely used in food manufacturing and industrial water treatment.


  • Boiler Water
  • Cooling Water
  • Disinfection Control
  • Drinking Water Treatment
  • Pool Water Control
  • Pool Water Treatment
  • Raw Water Treatment
  • Waste Water Treatment
Product finder
Title Packaging Unit Part Number Mark as favourite
DPD 1 Buffer Solution, Blue Bottle 15 ml 471010
DPD 1 Buffer Solution 100 ml 471011
DPD 1 Buffer Solution 1 pc. 471016
DPD 1 Reagent Solution, Green Bottle 15 ml 471020
DPD 1 Reagent Solution 100 ml 471021
DPD 1 Reagent Solution 1 pc. 471026
DPD 3 Solution, Red Bottle 15 ml 471030
DPD 3 Solution 100 ml 471031
DPD 3 Solution 1 pc. 471036
DPD Reagent Set 1 pc. 471056
Title Online Download Type Format Language Direct Download
Instruction Manual Single Method Chlorine L Instruction Manual PDF (2.39 MB)
Title Part Number SDS Country Direct Download
DPD 1 Buffer solution 424442
DPD 1 Reagent Solution 424443
DPD 3 Reagent Solution 424444