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Molybdenum, Molybdate
Sample Collection, Storage and Preservation
Accuracy Check
Molybdenum, Molybdate
Page 4 of 6
Collect samples in glass or plastic bottles. Analyze samples immediately.
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 Molybdenum Voluette
6+
500-mg/L Mo
.
5. Prepare three sample spikes. Fill three mixing cylinders (Cat. No. 1896-42)
with 100 mL of sample. Use the TenSette
0.3 mL of standard, respectively, to each sample and mix thoroughly.
6. Analyze 20 mL of each standard addition sample as described in the
procedure above, starting with the 0.1 mL sample spike. Accept each standard
additions reading by touching
approximately 100% recovery.
7. After completing the sequence, a graph of the best-fit line through the
standard additions data points will appear, accounting for matrix
interferences. Touch
spikes and the "Ideal Line" of 100% recovery.
See Section 3.2.2 Standard Additions on page 32 for more information.
Standard Solutions Method
1. Using Class A glassware, prepare a 2.00-mg/L molybdenum standard
solution by pipetting 10.00 mL of Molybdenum Standard Solution,
10.00-mg/L, into a 50-mL volumetric flask. Dilute to the mark with
deionized water. Prepare this solution daily. Perform the molybdenum
procedure as described above.
2. To adjust the calibration curve using the reading obtained with the
2.00-mg/L Mo standard solution, touch
menu. 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
®
®
Pipet to add 0.1 mL, 0.2 mL, and
. Each addition should reflect
Read
to view the relationship between the sample
Ideal Line
Options
.
to accept the displayed concentration (the value
Ampule Standard,
on the current program
Molybdenum_PP_Low_TER_Eng_Ody.fm
.
OK
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