Hanna Instruments HI 83208-2008 User Manual

Page 11

FREE CHLORINE

SPECIFICATIONS

Range

0.00 to 2.50 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 free chlorine and the

DPD reagent causes a pink tint in the sample.

REQUIRED REAGENTS

POWDER

Code

Description

Quantity

HI 93701-0

DPD

1 packet

LIQUID:
Code

Description

Quantity

HI 93701A-F

DPD1 Indicator

3 drops

HI 93701B-F

DPD1 Buffer

3 drops

REAGENT SETS

HI 93701-F Reagents for 300 tests (liquid)
HI 93701-01 Reagents for 100 tests (powder)
HI 93701-03 Reagents for 300 tests (powder)
For other accessories see page 73.

MEASUREMENT PROCEDURE

• Select the

Free Chlorine 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.

Free Chlorine

FREE CHLORINE

10 mL

Ammonia LR

• Remove the cuvette.

• Add 4 drops of HI 93700A-0 First reagent (6 drops for seawater

analysis). Replace the cap and mix the solution.

• Add 4 drops of HI 93700B-0 Second reagent (10 drops for seawater

analysis). Replace the cap and mix the solution.

• Reinsert the cuvette into the instrument.

• Press TIMER and the display will show the countdown prior to the

measurement or, alternatively, wait for 3 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 ammonia nitrogen
(NH

-N).

• Press the or to access the second level of functions.
• Press the Chem Frm functional key to convert the result in mg/L of ammonia (NH

) and ammonium (NH

• Press the or to go back to the measurement screen.

INTERFERENCES

Interference may be caused by: acetone, alcohols, aldehydes, glycine, hardness above 1 g/L, iron, organic

chloramines, sulfide, various aliphatic and aromatic amines.

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