Total Chlorine
Total Ch lo rine
50081_Chlorine_Total_Forward.fm Page 107
9. Add 1 SwifTest
dispensation (0.1 g) of
potassium iodide (KI).
Press the
CHECK MARK to
confirm.
Note: KI is added in excess;
the precise amount added is
not crucial for the accuracy or
precision of the analysis.
10. Add 1.0 mL of pH 4
acetate buffer.
Press the
CHECK MARK to
confirm.
Note: Acetate buffer is added
to adjust the sample pH; the
precise amount added is not
crucial for the accuracy or
precision of the analysis.
11. The timer will start.
The reagents will mix for a
brief period before starting
the titration.
12. Lower the electrode
head onto the beaker rim.
Press the
CHECK MARK to
confirm.
13. The analysis parameters
that have been stored for the
current Sub-ID may be
edited at this time.
Highlight the appropriate
line and press the
CHECK
MARK
to change one of the
analysis parameters or press
1 to confirm.
Note: Any changes made will
become the new default
parameters for this method
Sub-ID.
Note: These Sub-ID
parameters can be edited here
as 'run-time' settings, or from
the Main Menu as described in
Section 3.5.
Note: This step will be skipped
if autoscaling software is
enabled.
14. The Start Timer will
begin and allow the
electrode to stabilize before
data collection and titration
curve generation.
15. The Zoom Range
Determination window will
display the titration curve.
Use the navigation keys to
select and move the cursors
(vertical lines) to define the
range of data points for
analysis.
Proceed to step 16.
Note: Defining the range of
data points excludes
undesirable portions of the
titration curve from the
analysis.
16. Select the type of end
point determination.
Press the
CHECK MARK for
Automatic then proceed to
step 19 or press
DEL for
Manual.
Note: Automatic determination
attempts to identify optimal
linear segments without user
input.
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