What is the correct DPD reagent to use with the Pocket Colorimeter™ II for pH and Chlorine?

Document ID

Document ID TE489

Published Date

Published Date 27/05/2017
Question
What is the correct DPD reagent to use with the Pocket Colorimeter™ II for pH and Chlorine?
Summary
Reagents for the Chlorine/pH Pocket Colorimeter™ II
Answer
The Chlorine, Free and Total, High Range, DPD Method 10069 (free)/10070 (total), Powder Pillows, Pocket Colorimeter II procedure explains to add 5 mL sample to the plastic 1 cm/10 mL sample cell, and add the DPD reagent for 25 mL of sample, this is not a mistake.

The DPD reagent was originally formulated to measure a lower range of chlorine. The ratio of 25 mL DPD reagent to 5-mL sample allows the range on this instrument to extend to 10.0 mg/L Cl 2.The reagent inside a 5 mL and a 25 mL DPD powder pillow differs only in the amount (weight fill) of reagent inside the pillow.