Iron
Iron
Iron_UniCell_Other_PHEN_Eng_Ody.fm Page 3 of 4
Accuracy Check
Standard Additions Method (Sample Spike)
1. After reading test results, leave the sample cell (unspiked sample) in the
instrument.
2. Touch
Options. Touch Standard Additions. A summary of the standard
additions procedure will appear.
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. Prepare three sample spikes by filling three mixing cylinders with 100 mL of
sample. Pipet 0.1 mL, 0.2 mL, and 0.3 mL of 1000-mg/L Fe standard,
respectively, to each sample and mix thoroughly.
5. Transfer 4 mL of each solution into a sample vial and analyze as described in
the procedure. Touch
Read to accept each standard additions reading. Each
addition should reflect approximately 100% recovery.
See Section 3.2.2 Standard Additions on page 32 for more information.
Standard Solution Method
1. Prepare a 3.00-mg/L Fe standard solution by pipetting 0.3 mL of Iron
Standard Solution, 1000-mg/L, into a 100-mL volumetric flask. Dilute to the
mark with deionized water. Stopper and invert to mix. Prepare this solution
daily. Perform the iron procedure as described above.
2. To adjust the calibration curve using the reading obtained with the
3.00-mg/L Standard Solution, touch
Options on the current program menu.
Touch
Standard Adjust.
3. Touch
On. Touch Adjust to accept the displayed concentration. If an alternate
concentration is used, touch the number in the box to enter the actual
concentration, then touch
OK. Touch Adjust.
See Section 3.2.4 Adjusting the Standard Curve on page 40 for more information.
Method Performance
Precision
Standard: 3.00 mg/L Free Fe
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
276 2.63–3.37 mg/L Free Fe
Program Portion of Curve ∆Abs ∆Concentration
276 Entire range 0.010 0.022 mg/L Fee Fe
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