Hanna Instruments HI 83200C User Manual

Page 49

OZONE

SPECIFICATIONS

Range

0.00 to 2.00 mg/L

Resolution

0.01 mg/L

Accuracy

±0.02 mg/L ±3% of reading at 25 °C

Typical EMC

±0.01 mg/L

Deviation
Light Source

Tungsten lamp with narrow band interference filter @ 525 nm

Method

Colorimetric DPD Method. The reaction between ozone and the DPD reagent causes a
pink tint in the sample.

REQUIRED REAGENTS

Code

Description

Quantity/test

HI 93757-0

DPD Powder Reagent

1 packet

HI 93703-52-0 Glycine Powder (Optional Reagent) 1 packet

REAGENT SETS

HI 93757-01

Reagents for 100 tests

HI 93757-03

Reagents for 300 tests

HI 93703-52

Glycine Powder, Optional Reagent for 100 tests

For other accessories see page 128.

IMPORTANT NOTE: Chlorine is a strong interferent for ozone determination. If the sample is suspected to
contain chlorine residues (free or total chlorine), please follow the

alternative measurement procedure

described below:
• Perform the Standard Measurement Procedure and take note of the reading:

value A.

• On a fresh sample perform the Additional Measurement Procedure and take note of the reading:

value B.

• Subtract reading

B from reading A to obtain the ozone concentration in mg/L:

mg/L (O

) =

value A – value B.

STANDARD MEASUREMENT PROCEDURE

• Select the

Ozone 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.

Ozone

Dissolved Oxygen

• Let the sample stand and the flocculent agent will start to settle.

• After approximately 2 minutes, when the upper half of the bottle becomes limpid,

add 10 drops of HI 93732C-0.

• Replace the cap and invert the bottle until the settled flocculent dissolves completely.

The sample is ready for measurement when it is yellow and completely limpid.

• Fill the cuvette up to the mark with 10 mL of the unreacted

(original) sample, and replace the cap. This is the blank.

• 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 cuvette.

• Fill another cuvette up to the mark with 10 mL of the reacted

sample and replace the cap.

• Reinsert the cuvette into the instrument.

• Press

Read to start the reading. The instrument will display the results in mg/L of dissolved oxygen.

INTERFERENCES

Interferences may be caused by reducing and oxidizing materials.

10 mL