Copper
Copper
Page 4 of 6
Copper_PP_Low_POR_Eng_Ody.fm
4. 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.
5. Fill eight sample cells with 10 mL of sample. Use the TenSette
®
Pipet to add
0.1 mL of Copper Standard Solution, 4000-µg/L Cu, to two of the sample
cells. Then pipet 0.2 mL of the standard solution into two more cells. Finally,
pipet 0.3 mL of the standard solution into two more cells.
6. Analyze each standard addition sample as described in the procedure above,
using one of the two spiked samples in each set as the blank. Accept each
standard additions reading by touching
Read. The copper concentration
reading 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. To assure the accuracy of the test, prepare a 150-µg/L copper standard by
pipetting 15.00 mL of Copper Standard Solution, 10.0-mg/L Cu, into a
1000-mL volumetric flask.
2. Dilute to the mark with copper-free, reagent-grade water. Prepare this
solution daily. Perform the copper procedure as described above.
3. To adjust the calibration curve using the reading obtained with the 150-µg/L
standard solution, touch
Options on the current program menu. Touch
Standard Adjust.
4. 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: 50 µg/L Cu
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
145 45–55 µg/L Cu
Portion of Curve ∆Abs ∆Concentration
Entire range 0.010 2 µg/L Cu
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