Hanna-instruments HI 83099 Manual de usuario descargar pdf (Pagina 52)

103102

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 132.

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 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

10 mL

• Select

Oxygen Demand, Chemical LR

(COD)

method following one of the

procedures described in the

Method

Selection

section (see page 12).

• Place the COD vial adapter in the

cuvet holder and ensure that the

adapter is well fit inside.

• Place the blank vial into the holder and push it completely down.

• Press the Zero key and the instrument will perform a zero sequence. If the zero sequence was

successfully done, the display will show “-0.0-”. Now the meter is zeroed and ready for measurement.

• Remove the blank vial.

• Place the sample vial into the holder and push it completely down.

• Press Read and the instrument will perform the reading.

• The instrument displays concentration in mg/L of oxygen demand.

INTERFERENCES

Interference may be caused by:

Chloride (Cl¯) above 2000 mg/L.

Samples with higher chloride concentration should be diluted.

COD LR

1 2 ... 47 48 49 50 51 52 53 54 55 56 57 ... 68 69

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Hanna-instruments HI 83099 Manual de usuario Pagina 52

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