Hanna Instruments HI 83203-2008 User Manual

Page 12

Total Chlorine

TOTAL CHLORINE

SPECIFICATIONS

Range

0.00 to 3.50 mg/L

Resolution

0.01 mg/L

Accuracy ±0.03 mg/L ±3% of reading
Typical EMC

±0.01 mg/L

Deviation
Light Source

Tungsten lamp with narrow band interference filter @ 525 nm

Method

Adaptation of the

EPA DPD method 330.5. The reaction between the chlorine and the

DPD reagent causes a pink tint in the sample.

REQUIRED REAGENTS

POWDER:

Code

Description

Quantity

HI 93711-0

DPD

1 packet

LIQUID:

Code

Description

Quantity

HI 93701A-T

DPD1 indicator

3 drops

HI 93701B-T

DPD1 buffer

3 drops

HI 93701C

DPD3 solution

1 drop

REAGENT SETS

HI 93701-T Reagents for 300 total chlorine tests (liquid)
HI 93711-01 Reagents for 100 total chlorine tests (powder)
HI 93711-03 Reagents for 300 total chlorine tests (powder)
For other accessories see page 46.

MEASUREMENT PROCEDURE

• Select the

Total Chlorine method using the proce-

dure described in the

Method Selection section (see

page 11).

• Fill the cuvette with 10 mL of unreacted sample

(up to the mark) and replace the cap.

• Place the cuvette into the holder and close the lid.

10 mL

• Reinsert the cuvette into the instrument.

• Press READ to start the reading. The instrument displays the results

in mg/L of free chlorine.

INTERFERENCES

Interference may be caused by: Bromine, Iodine, Ozone, Oxidized forms of Chromium and Manganese.
In case of water with hardness greater than 500 mg/L CaCO

, shake the sample for approximately 2

minutes after adding the powder reagent.
In case of water with alkalinity greater than 250 mg/L CaCO

or acidity greater than 150 mg/L CaCO

the color of the sample may develop only partially, or may rapidly fade. To resolve this, neutralize the
sample with diluted HCl or NaOH.

Free Chlorine