Fluoride
Fluoride
Fluoride_UniCell_Other_SPA_Eng_Ody.fm Page 3 of 4
3. Touch OK to accept the default values for standard concentration, sample
volume, and spike volumes. Touch
Edit to change these values. After values
are accepted, the unspiked sample reading will appear in the top row. See
Standard Additions in the instrument manual for more information.
4. Measure 100 mL of sample into three graduated cylinders.
5. Pipet 0.20 mL, 0.40 mL, and 0.60 mL of 100-mg/L F
–
Standard Solution,
respectively, into the three cylinders and mix thoroughly.
6. Analyze as described in the procedure. Accept each standard additions
reading by touching
Read. Each addition should reflect approximately 100%
recovery.
7. After completing the sequence, touch
Graph to view the best-fit line through
the standard additions data points, accounting for matrix interferences. Touch
View: Fit, then select Ideal Line and touch OK to view the relationship between
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. Analyze a 1.00-mg/L F
–
Standard Solution using the procedure
described above.
2. To adjust the calibration curve using the reading obtained with the
1.00-mg/L standard solution, touch
Options on the current program menu.
Touch
Standard Adjust.
3. Touch
On. Touch Adjust to accept the displayed concentration (the value
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
OK.
Touch
Adjust.
Perform the Fluoride procedure as described above. See Section 3.2.4 Adjusting
the Standard Curve on page 40 for more information.
Method Performance
Precision
Standard: 1.00 mg/L F
–
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
See Section 3.4.5 Sensitivity on page 44 for more information.
Program 95% Confidence Limits of Distribution
810 0.76–1.24 mg/L F
–
Program Portion of Curve ∆Abs ∆Concentration
810 0.30 0.010 0.05 mg/L F
–
810 0.80 0.010 0.06 mg/L F
–
810 1.20 0.010 0.06 mg/L F
–
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