Hanna-instruments HI 83266 Manual do Utilizador descarregar pdf (Página 20)

38 39

Iron

• 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 press Read. When the timer ends the meter will perform the reading.

• The instrument displays concentration in mg/L of iron.

INTERFERENCES

Interference may be caused by:

Molybdate Molybdenum above 50 ppm

Calcium above 10000 ppm (as CaCO

)

Magnesium above 100000 ppm (as CaCO

)

Chloride above 185000 ppm.

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 46.

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

from reading

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 15).

• 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

10 mL

1 2 ... 15 16 17 18 19 20 21 22 23 24 25

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