Hanna Instruments HI 83099 User Manual

Page 33

Iodine

• Reinsert the cuvette into the instrument.

• 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 concentration in

mg/L of iodine.

INTERFERENCES

Interference may be caused by: Bromine, Chlorine, 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 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.

IODINE

SPECIFICATIONS

Range

0.0 to 12.5 mg/L

Resolution

0.1 mg/L

Accuracy

±0.1 mg/L ±5% of reading at 25 °C

Typical EMC

±0.1 mg/L

Deviation
Light Source

Tungsten lamp with narrow band interference filter @ 525 nm

Method

Adaptation of the

Standard Methods for the Examination of Water and Wastewater,

edition, DPD method. The reaction between iodine and the reagent causes a pink

tint in the sample.

REQUIRED REAGENTS

Code

Description

Quantity

HI 93718-0

DPD Reagent

1 packet

REAGENT SETS

HI 93718-01 Reagents for 100 tests
HI 93718-03 Reagents for 300 tests
For other accessories see page 132.

MEASUREMENT PROCEDURE

• Select the

Iodine method using the procedure described in

the

Method Selection section (see page 12).

• 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.

• Press the

Zero key. The display will show “-0.0-” when the meter is zeroed and ready for

measurement.

• Remove the cap and add the content of one packet of

HI 93718-0 DPD reagent. Replace the cap and shake
gently for about 30 seconds to dissolve most of the reagent.

10 mL

Iodine