Hanna Instruments HI 83099 - Manual (Page 52)

103 102
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 B from reading A to obtain the ozone concentration in mg/L:
mg/L (O
3
) = 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