Is a sample containing chlorine above 20 mg/L all in the free chlorine form?

Document ID

Document ID TE214

Published Date

Published Date 27/05/2017
Question
Is a sample containing chlorine above 20 mg/L all in the free chlorine form?
Summary
Form of chlorine present when concentrations are over 20 mg/L
Answer
Although this is true in most cases, this is not true in all sample matrices. For example, a sample that is high in chloramines would cause a high total reading but there would be no free chlorine in the sample.