Can the Chlorine DPD powder pillow be added to the sample cell or viewing tube, prior to adding the sample?

Document ID

Document ID TE221

Version

Version 5.0

Status

Status Published

Published Date

Published Date 05/19/2019
Question
Can the Chlorine DPD powder pillow be added to the sample cell or viewing tube, prior to adding the sample?
Summary
Inaccuracy when adding sample to DPD chlorine chemistry
Answer
Experiments have shown that adding the sample to the powder (instead of how the procedure is written) could cause inconsistent results. The most common cause for inconsistency is poor rinsing of the cell which could result in carry over between tests.

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