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Important Terms to Know
- Free chlorine: combination of Cl2, HOCl, and OCl-
- Combined chlorine: formed when ammonia is added to free chlorine,
yielding chloramines: mono-, di-, tri-, organic
- Total chlorine: combination of free and combined chlorine in solution
Which Measurement Should You Use?
- For applications that contain no ammonia, a free chlorine measurement is appropriate.
- For applications where ammonia or chloramines might be present, such as wastewater and drinking water, a total chlorine measurement is appropriate.
What Makes The Measurements Different?
- The main difference is which probe you will use.
- The Kuntze Zirkon® DIS is for free chlorine measurement, and measures the presence of only HOCl.
- The Kuntze Zirkon® DIS Total measures the presence of both HOCl and OCl-, which allows the analyzer to give a total chlorine measurement.
Important Things to Keep in Mind
- Be sure your reference measurement is configured to measure the correct parameter, and that you have purchased the correct reagents to do so.
- The free chlorine measurement works best below pH 8.5, while the total chlorine measurement is capable of going up to pH 10.
- If you have any further questions, please contact a Kuntze representative.
