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Method Performance
Summary of Method
Required Reagents
Description
Reagent Set .......................................................................................................................................................25569-00
Includes:
DPD Indicator Powder................................................................................................ 24 g....................22972-55
Free Chlorine Indicator Solution ..................................................... 1 mL ................ 473 mL..............23140-11
Free Chlorine Buffer Solution........................................................... 1 mL ................ 473 mL..............23141-11
Required Apparatus
Adapter, multi-pathlength cell ............................................................... 1 ....................... each....................59466-00
Cylinder, mixing, glass, 100-mL ............................................................. 1 ....................... each.....................1896-42
Dispenser, fixed volume, 1.0 mL Repipet Jr.......................................... 2 ....................... each................... 21113-01
Pour-Thru Cell Kit .................................................................................... 1 ....................... each...................59404-00
Required Standards
Chlorine Standard Solution, Voluette
or
Chlorine Standard Solution, Voluette
Water, deionized ................................................................................................................. 4 L .........................272-56
ChlorineFre_PT_Other_DPD_Eng_Ody.fm
Precision
Standard: 1.07 mg/L Cl
Program
82
See Section 3.4.3 Precision on page 44 for more information, or if the standard
concentration did not fall within the specified range.
Sensitivity
Portion of Curve
Entire range
See Section 3.4.5 Sensitivity on page 44 for more information.
Chlorine in the sample as hypochlorous acid or hypochlorite ion (free chlorine or
free available chlorine) immediately reacts with DPD (N,N-diethyl-p-
phenylenediamine) indicator to form a red color which is proportional to the
chlorine concentration. Test results are measured at 530 nm.
®
Ampule, 50-75 mg/L, 10-mL........................ 16/pkg..............14268-10
®
Ampule, 50-75 mg/L, 2-mL.......................... 20/pkg..............14268-20
2
95% Confidence Limits of Distribution
1.05–1.09 mg/L Cl
∆Abs
0.010
Quantity Required
Per Test
Chlorine, Free
2
∆Concentration
0.02 mg/L Cl
2
Unit
Cat. No.
Chlorine, Free
Page 5 of 6
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