Hanna Instruments HI 83200C User Manual

Page 20

Chlorine Dioxide

CHLORINE DIOXIDE

SPECIFICATIONS

Range

0.00 to 2.00 mg/L

Resolution

0.01 mg/L

Accuracy

±0.10 mg/L ±5% of reading at 25 °C

Typical EMC

±0.01 mg/L

Deviation
Light Source

Tungsten lamp with narrow band interference filter @ 575 nm

Method

Adaptation of the Chlorophenol Red method. The reaction between chlorine dioxide and
reagents causes a colorless to purple tint in the sample.

REQUIRED REAGENT

Code

Description

Quantity

HI 93738

A-0

Reagent A

1 mL

HI 93738

B-0

Dechlorinating Reagent B

1 packet

HI 93738

C-0

Reagent C

1 mL

HI 93738

D-0

Reagent D

1 mL

REAGENT SETS

HI 93738-01 Reagents for 100 tests
HI 93738-03 Reagents for 300 tests
For other accessories see page 128.

MEASUREMENT PROCEDURE

• Select the

Chlorine Dioxide method using the procedure

described in the

Method Selection section (see page 12).

• Fill two graduated mixing cylinders (#1 & #2) up to the

25 mL mark with the sample.

• Add 0.5 mL of HI 93738A-0 Chlorine Dioxide Reagent to each cylinder (#1 & #2), close them and

invert several times to mix.

• Press

Timer and the display will show the countdown prior to the measurement or, alternatively, wait

for 2 minutes and 30 seconds and press

Read. When the timer ends the meter will perform the

reading.

• The instrument displays the results in

mg/L of total chlorine.

Note: free and total chlorine have to be measured separately with fresh unreacted samples following
the related procedure if both values are requested.

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.

Total Chlorine

# 2

25 mL

# 1

25 mL

# 1 & # 2

# 1

# 2