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Accuracy Check
Method Performance
Silica_PTRL_ULow_HTB_Eng_Ody.fm
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. Prepare three samples as instructed in the procedure. Fill three 250-mL
Erlenmeyer flasks with 50 mL of sample. Use the TenSette
0.1 mL, 0.2 mL, and 0.3 mL of 1-mg/L (1000-µg/L) Silica standard,
respectively, to each flask and mix thoroughly.
5. 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
6. 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. Use the 500-µg/L SiO
place of the sample. Perform the silica procedure as described above.
2. To adjust the calibration curve using the reading obtained with the
500-µg/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
For more information, see Section 3.2.4 Adjusting the Standard Curve on page 40.
Precision
Standard: 500 µg/L silica
Program
645
See Section 3.4.3 Precision on page 44 for more information, or if the standard
concentration did not fall within the specified range.
Sensitivity
Portion of Curve
Entire range
See Section 3.4.5 Sensitivity on page 44 for more information.
. A summary of the standard
Standard Additions
to change these values. After values
Edit
Graph
and touch
Ideal Line
OK
Standard Solution listed under Required Standards in
2
on the current program menu.
Options
.
to accept the displayed concentration (the value
95% Confidence Limits of Distribution
497.6–502.4 µg/L silica
∆Abs
0.010
®
Pipet to add
to view the best-fit line through
to view the relationship between
∆Concentration
12 µg/L silica
Page 5 of 6
Silica
.
OK
Silica
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