Hanna Instruments HI 83099 User Manual

Page 28

• Press

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

for two minutes and press

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

measurement.

• Remove the cuvette.

• Insert the other cuvette (# 2) with the reacted sample into the

instrument.

• Press

Read to start reading. The instrument displays the results in mg/L of fluoride.

Note: For wastewater or seawater samples, before performing measurements, distillation is required.
For most accurate results, use two graduated pipettes to deliver exactly 8 mL of distilled water and
8 mL of sample.

Fluoride

# 2

INTERFERENCES

Interferences may be caused by:
Alkalinity (as CaCO

) above 5000 mg/L

Aluminum above 0.1 mg/L
Iron, ferric above 10 mg/L
Chloride above 700 mg/L
Phosphate, ortho above 16 mg/L
Sodium hexametaphosphate above 1.0 mg/L
Sulfate above 200 mg/L
Highly colored and turbid samples may require distillation
Highly alkaline samples can be neutralized with nitric acid.

Fluoride

FLUORIDE

SPECIFICATIONS

Range

0.00 to 2.00 mg/L

Resolution

0.01 mg/L

Accuracy

±0.03 mg/L ±3% 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

Standard Methods for the Examination of Water and Wastewater,

edition, SPADNS method. The reaction between fluoride and the liquid reagent

causes a red tint in the sample.

REQUIRED REAGENT

Code

Description

Quantity

HI 93729-0

SPADNS Reagent

4 mL

REAGENT SETS

HI 93729-01 Reagents for 100 tests
HI 93729-03 Reagents for 300 tests
For other accessories see page 132.

MEASUREMENT PROCEDURE

• Select the

Fluoride method using the procedure described in the

Method Selection section (see page 12).

• Add 2 mL of HI 93729-0 SPADNS Reagent to two cuvettes.

• Fill one of the cuvettes with distilled water up to the mark,

replace the cap and invert several times to mix.

• Fill the other cuvette with sample up to the mark, replace the

cap and invert several times to mix.

• Place the cuvette with the reacted distilled water (# 1) into

the holder and close the lid.

# 1

# 2

10 mL

2 mL