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Sample Collection, Storage and Preservation
Accuracy Check
Manganese_PP_Low_PAN_Eng_Ody.fm
For samples that contain hardness greater than 300 mg/L CaCO
of Rochelle Salt Solution (Cat. No. 1725-33) to the sample after adding the
Ascorbic Acid Powder Pillow in step 4.
Collect samples in a clean plastic container. Adjust the pH to 2 or less with
Concentrated Nitric Acid (about 2 mL per liter) (Cat. No. 152-49). Preserved samples
can be stored up to six months at room temperature. Adjust the pH to between 4–5
with 5.0 N Sodium Hydroxide (Cat. No. 2450-32) before analysis. Correct the test
result for volume additions; see 3.1.3 Correcting for Volume Additions.
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
5. Prepare three sample spikes. Fill three Mixing Cylinders (Cat. No. 1896-40)
with 10 mL of sample. Use the TenSette
0.1 mL, 0.2 mL, and 0.3 mL of standard, respectively, to each sample and mix
thoroughly.
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 0.5-mg/L manganese standard solution by pipetting 2.0 mL of
Manganese Voluette Standard Solution, 250-mg/L Mn, into a 1000-mL
volumetric flask. Dilute to the mark with deionized water. This solution
should be prepared daily. Perform the manganese procedure as described
above.
2. To adjust the calibration curve using the reading obtained with the 0.5-mg/L
standard solution, 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
See Section 3.2.4 Adjusting the Standard Curve on page 40 for more information.
. A summary of the standard
Standard Additions
to change these values. After values
Edit
®
Ampule Standard, 10-mg/L Mn.
®
Pipet (Cat. No. 19700-01) to add
Graph
and touch
Ideal Line
OK
on the current program menu. Touch
Options
to accept the displayed concentration (the value
Manganese
, add 10 drops
3
to view the best-fit line through
to view the relationship between
Manganese
Page 3 of 4
.
OK
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