Converting sodium hypochlorite concentration between g/L and weight percent

Trial design and interpretation

In this example, a density of 1.20 kg/L and available chlorine of 120 g/L at the same temperature give an available chlorine mass fraction of 120 ÷ 1,200 = 10%. For delivery acceptance, use the actual lot density and test time.

Recording Available chlorine

Available chlorine: use the agreed method. When converting units, include test temperature and density. Free alkali (as NaOH) (Mass fraction): ENVO published industrial solution 0.1–1.0%. Check the available-chlorine grade ordered and the time of testing.

How do we compare available chlorine in g/L and mass percent?

Use the density of the same sample at a stated temperature, then compare analytical dates and methods. Liquids for industrial water treatment: Use the approved site method to compare available chlorine on arrival and during storage. Check free alkali separately.

What to record

• Available chlorine (g/L)
• Density and temperature
• Mass fraction
• Time tested

Technical references

• ENVO public product information · Verify against the ordered grade and lot ↗

Products and processes