Pool Line Hypochlorite (as Cl₂), Range: (50-150 g/L) Method: titration, approx. 100 tests

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HI38434 Pool Line Bleach Test Kit is used to determine the concentration of sodium hypochlorite (bleach) that is added to swimming pools, hot tubs and spas. This test kit can measure from 50 g/L (5%) to 150 g/L (15%)

  • Supplied with enough reagents to measure up to 100 tests on average
  • Wide range up to 150 g/L (15%) Chlorine (Cl2)
  • Iodometric drop type titration method
Sodium hypochlorite (bleach) is a commonly used disinfectant for swimming pools, spas and hot tubs. Bleach purchased for disinfection will usually contain 100 to 150 g/L (10 to 15%) of chlorine. The concentration of bleach will degrade and lose its strength during storage. For bodies of water that are continuously monitored and controlled with process instrumentation this change in concentration can cause issues with instrument settings. Control parameters are set based on the strength of the chemical being dosed. For this reason it is important to monitor the concentration of chlorine that is being purchased for the automatic dosing into the swimming pool, hot tub or spa. Available chlorine refers to chlorine liberated by the action of dilute acids on hypochlorite: OCl-  Cl-  2H  = Cl2  H2O HI38434 uses an iodometric titration method. First, the hypochlorite solution is treated with potassium iodide and acidified with a strong acid. The amount of iodine generated is equivalent to the chlorine in the sample. The next step is to determine the concentration of iodine by the titration with thiosulfate to reduce the iodine back to iodide ions. The amount of thiosulfate added is then used to calculate the amount of chlorine that was in the original sample.


Hypochlorite Measurement Type chemical test kit
Hypochlorite Range 50 to 150 g/L (5 to 15%) Chlorine (Cl2)
Hypochlorite Resolution 5 g/L (0.5%) as Chlorine (Cl2)
Hypochlorite Method iodometric titration method
Hypochlorite Number of Tests 100 (average)
Weight 485 g (17.1 oz.)
Dimensions 235 x 175 x 115 mm (9.2 x 6.9 x 4.5”)
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