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Sample Collection, Storage and Preservation
Accuracy Check
Manganese_PP_High_POX_Eng_Ody.fm
Collect samples in acid-washed plastic bottles. Do not use glass containers due
to possible adsorption of Mn to glass. If samples are acidified, adjust the pH to
4–5 with 5.0 N Sodium Hydroxide (Cat. No. 2450-32) before analysis. Do not
exceed pH 5, as manganese may precipitate. Correct the test result for volume
additions; see Section 3.1.3 Correcting for Volume Additions on page 29.
Standard Additions Method (Sample Spike)
1. After reading test results, leave the sample cell (unspiked sample) in the
instrument. Verify the chemical form.
2. Touch
. Touch
Options
additions procedure will appear.
3. Touch
to accept the default values for standard concentration, sample
OK
volume, and spike volumes. Touch
are accepted, the unspiked sample reading will appear in the top row. See
Standard Additions in the instrument manual for more information.
4. Snap the neck off a Manganese Voluette
(Cat. No. 14258-10).
5. Prepare three sample spikes. Fill three Graduated Mixing Cylinders
(Cat. No. 1896-40) with 10 mL of sample. Use the TenSette
(Cat. No. 19700-01) to add 0.1 mL, 0.2 mL, and 0.3 mL of standard,
respectively, to each sample and mix thoroughly. This will result in a
2.5 mg/L increase in manganese in each sample spike.
6. Analyze each sample spike as described in the procedure above, starting with
the 0.1 mL sample spike. Accept each standard additions reading by touching
. Each addition should reflect approximately 100% recovery.
Read
7. After completing the sequence, touch
the standard additions data points, accounting for matrix interferences. Touch
, then select
View: Fit
the sample spikes and the "Ideal Line" of 100% recovery.
See Section 3.2.2 Standard Additions on page 32 for more information.
Standard Solution Method
1. Prepare a 10.0-mg/L manganese standard solution by pipetting 10.0 mL of
Manganese Standard Solution, 1000-mg/L, into a 1000-mL volumetric flask.
Dilute to the mark with deionized water. Prepare this solution daily. Perform
the manganese periodate oxidation procedure as described above.
2. The calibration curve can be adjusted to account for variability in laboratory
technique. To adjust the calibration curve using the reading obtained with the
10.0 mg/L standard solution, touch
Touch
Standard Adjust
3. Touch
. Touch
On
Adjust
depends on the selected chemical form). If an alternate concentration is used,
touch the number in the box to enter the actual concentration, then touch
Touch
.
Adjust
. A summary of the standard
Standard Additions
to change these values. After values
Edit
®
Ampule Standard, 250-mg/L Mn
Graph
and touch
Ideal Line
OK
Options
.
to accept the displayed concentration (the value
Manganese
®
Pipet
to view the best-fit line through
to view the relationship between
on the current program menu.
Manganese
Page 3 of 4
.
OK
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