Hanna-instruments HI 83099 Manual do Utilizador descarregar pdf (Página 28)

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• 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 mL10 mL

2 mL

1 2 ... 23 24 25 26 27 28 29 30 31 32 33 ... 68 69

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