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Chlorine Dioxide Generator Yield
50081_ChlorineDioxideGeneratorYield.fm
Page 67
Chlorine Dioxide
Generator Yield
• Soak all glassware in a strong chlorine dioxide (ClO
2
) solution (300–500 mg/L) for at least 1 hour.
Rinse thoroughly with deionized water. Use the glassware for this method only.
• Chlorine dioxide and its by-products are volatile and can be easily lost from aqueous solution. Minimize air contact by collecting
the effluent sample into an amber glass bottle with minimum headspace.
• Minimize agitation when measuring sample volumes. Remove sample portions with a volumetric pipet. Always place the tip at the
bottom of the sample container.
• Always use organic-free water for effluent sample dilution (Cat. No. 26415-49).
• Rinse the electrode, temperature probe, and anti-diffusion tip with deionized water before every titration.
.
• Download the “Certificate of Analysis” (COA) to obtain the exact concentration of any unopened bottle of Hach titrant or standard
solution. See
Obtaining the Certificate of Analysis for Hach Reagents
.
• Hach buffer reagents for chlorine titrations are highly recommended for this analysis.
• Never substitute buffers designed for calibrating pH meters. They may contain dyes that interfere with amperometric titration.
• Never use buffers contaminated with mold or bacteria.
• Adjust the contrast of the display by accessing the Methods menu and pressing
7
to lighten or
0
to darken.
• A distinction is drawn between running a new test and a new sample. Each test is a replicate run of the current or previous
sample analysis. The AutoCAT 9000 automatically tracks the results of a series of tests, and automatically calculates the mean
and standard deviation for all the results. Each test is given a different number, all of which are listed under the same Sample ID.
When starting a new sample, a new ID is assigned.
• The AutoCAT 9000 can accommodate any sample size. The default volume for this method is 5.0 mL and can be adjusted to
expand the test range.
• The AutoCAT 9000 calculates concentration based on the sample volume. Ensure that the sample volume is correct.
• Press
STOP
at any time to interrupt instrument operation; the user can resume, restart, or quit completely.
• Press the
CHECK MARK
at any time during data acquisition to halt data collection.
• Press
DEL
during any timer period (except Start Timer) to immediately exit the timer and proceed to the next step.
• Press
ESC
during any titration/calibration data collection period or timer to access
Edition
mode. See
• Flush the burette each day before the first sample test or calibration is performed. See
• Flush the burette when changing titrants. See
Amperometric Forward Titration
Titration Workstation
Chlorine Dioxide
Chlorite
Free Chlorine
100–5000 mg/L as Cl0
2
100–5000 mg/L as Cl0
2
–
100–2000 mg/L as Cl
2
Scope and Application:
For yield calculation of a chlorine dioxide generator*
* Procedure equivalent to
Standard Methods
4500-ClO
2
E.
Sample Tips and Techniques
Reagent Tips and Techniques
Instrument Tips and Techniques
Содержание AutoCAT 9000
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