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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
t h
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 93719
A
-0 Hardness
Ca & Mg indicator 0.5 mL
HI 93719
B
-0 Hardness
Alkali solution
0.5 mL
HI 93719
C
-0 Hardness
EDTA solution
1 drop
HI 93719
D
-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)