Nickel
Nickel
Page 4 of 6
Nickel_PP_Other_HEP_Eng_Ody.fm
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. Snap the neck off a Nickel Voluette
®
Ampule Standard, 300-mg/L Ni.
5. Prepare three sample spikes. Use the TenSette
®
Pipet to add 0.2 mL, 0.4 mL,
and 0.6 mL of standard, respectively, to three 300-mL samples 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 Solutions Method
1. Prepare a 10.0-mg/L nickel working standard solution by pipetting 10.0 mL
of a Nickel Standard Solution, 1000-mg/L, into a 1000-mL volumetric flask.
Dilute to the mark with deionized water. Prepare this solution daily. Prepare
a 1.0-mg/L nickel standard solution by diluting 50.0 mL of the 10-mg/L
working standard solution to 500 mL in a volumetric flask. Perform the
heptoxime procedure as described above.
2. To adjust the calibration curve using the reading obtained with the 1.0-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.
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