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HI 93745
Chlorine/pH/Iron LR/Hardness
Light Source Light Emitting Diode @ 555 nm
Method For pH, Phenol red method. The reaction be-
tween pH and the reagent causes a red tint in
the sample.
For Chlorine, adaptation of the EPA recom-
mended DPD method 330.5. The reaction
between chlorine and the reagent causes a pink
tint in the sample.
For Iron, Adaptation of the TPTZ Method. The
reaction between iron and the reagent causes a
blue tint in the sample.
For Hardness, adaptation of the Standard Meth-
ods for the Examination of Water and
Wastewater, 18
th
edition, Calmagite/colorimet-
ric method. The reaction between hardness and
reagents causes a maroon tint in the sample.
REQUIRED REAGENTS
Code Unit Description Quantity
HI 93710-0 pH Phenol red 5 drops
HI 93701-0 Free Cl
2
DPD 1 packet
HI 93711-0 Total Cl
2
DPD 1 packet
HI 93746-0 Iron LR TPTZ Reagent 2 packets
HI 93719A-0 Hardness Ca & Mg indicator 0.5 mL
HI 93719B-0 Hardness Alkali solution 0.5 mL
HI 93719C-0 Hardness EDTA solution 1 drop
HI 93719D-0 Hardness EGTA solution 1 drop
Liquid version (chlorine):
HI 93701A-F Free Cl
2
DPD1 indicator 3 drops
HI 93701B-F Free Cl
2
DPD1 buffer 3 drops
HI 93701A-T Total Cl
2
DPD1 indicator 3 drops
HI 93701B-T Total Cl
2
DPD1 buffer 3 drops
HI 93701-C Total Cl
2
DPD3 solution 1 drop
REAGENT SETS
HI 93710-01 Reagents for 100 pH tests
HI 93710-03 Reagents for 300 pH tests
HI 93701-01 Reagents for 100 free chlorine tests
HI 93701-03 Reagents for 300 free chlorine tests
HI 93711-01 Reagents for 100 total chlorine tests
HI 93711-03 Reagents for 300 total chlorine tests
HI 93701-F Reagents for 300 free chlorine tests (liquid version)
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