What is the purpose of the blank procedure listed in Ultra Low Range Chlorine methods 10014 and 8370 and how often should they be performed?

Document ID

Document ID TE7062

Published Date

Published Date 27/05/2017
Question
What is the purpose of the blank procedure listed in Ultra Low Range Chlorine methods 10014 and 8370 and how often should they be performed?
Summary
Blank procedure in Ultra Low Range Chlorine methods 10014 and 8370.
 
Answer
In general, the sample is used to zero the instrument when performing Ultra Low Range Chlorine methods 10014 and 8370.

There is an extra procedure to determine the reagent blank which can be subtracted from chlorine measurements to increase accuracy.

For combined lot numbers of indicator and buffer reagent solutions, it is recommended to perform a new reagent blank value at least once per day.