Hach DR2400 - Page 579

Ozone
Ozone
Ozone_AccuVac_Other_IND_Eng_Ody.fm Page 3 of 4
Method Performance
Precision
Standard:
0.15 mg/L for program number 454
0.45 mg/L for program number 455
1.00 mg/L for program number 456
See Section 3.4.3 Precision on page 44 for more information, or if the standard
concentration did not fall within the specified range.
Sensitivity
See Section 3.4.5 Sensitivity on page 44 for more information.
Summary of Method
The reagent formulation adjusts the sample pH to 2.5 after the ampule has filled.
The indigo reagent reacts immediately and quantitatively with ozone. The blue
color of indigo is bleached in proportion to the amount of ozone present in the
sample. Other reagents in the formulation prevent chlorine interference. No
transfer of sample is needed in the procedure. Therefore, ozone loss due to
sampling is eliminated. Test results are measured at 600 nm.
Required Reagents
Quantity Required
Description Per Test Unit Cat. No.
Select one or more Ozone AccuVac
®
Ampuls based on range:
0–0.25 mg/L.......................................................................................2 ampuls......... 25/pkg...............25160-25
0–0.75 mg/L.......................................................................................2 ampuls......... 25/pkg...............25170-25
0–1.50 mg/L.......................................................................................2 ampuls......... 25/pkg...............25180-25
Required Apparatus
Polypropylene Beaker, 50-mL, Low Form, with pour spout........................................ each......................1080-41
Snapper, AccuVac
®
............................................................................................................. each....................24052-00
Program 95% Confidence Limits of Distribution
454 0.14–0.16 mg/L O
3
455 0.43–0.47 mg/L O
3
456 0.97–1.03 mg/L O
3
Program ∆Abs ∆Concentration
454 0.010 0.01 mg/L O
3
455 0.010 0.01 mg/L O
3
456 0.010 0.01 mg/L O
3