1—50
Chlorine, Free and Total, HR, continued
Subtract the results of the free chlorine test from the total chlorine test to obtain the
combined chlorine concentration.
The range of analysis using the DPD method for chlorine is extended by adding more
indicator in proportion to sample volume. Thus, a larger, 25-mL size powder pillow of
DPD Reagent is added to a 5-mL sample.
Replacement Parts
Required Reagents
Description Unit Cat. No.
Free Chlorine Tests
DPD Free Chlorine Reagent
Powder Pillows for 25-mL sample...........................................100/pkg..... 14070-99
Total Chlorine Tests
DPD Total Chlorine Reagent
Powder Pillows for 25-mL sample...........................................100/pkg..... 14064-99
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