Table of Contents
Advertisement
Accuracy Check
Method Performance
Copper_UniCell_Other_BATH_Eng_Ody.fm
Standard Additions Method (Sample Spike)
1. After reading test results, leave the sample cell (unspiked sample) in the
instrument.
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 sample spikes. Fill three mixing cylinders with 100 mL of
sample. Pipet 0.1 mL, 0.2 mL, and 0.3 mL of 1000-mg/L Cu standard,
respectively, to each sample and mix each thoroughly.
5. Transfer 4 mL of each solution to three sample vials and analyze as described
in the procedure. Accept each standard additions reading by touching
Each addition should reflect approximately 100% recovery.
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 Solutions Method
Prepare a 2.00-mg/L Standard as follows:
1. Pipet 0.2 mL of 1000-mg/L Cu into a 100-mL volumetric flask. Dilute to the
mark with deionized water. Stopper and invert to mix. Prepare this solution
daily. Perform the copper procedure as described.
2. To adjust the calibration curve using the reading obtained with the
2.00-mg/L standard solution, touch
Touch
Standard Adjust
3. Touch
. Touch
On
Adjust
concentration is used, touch the number in the box to enter the actual
concentration, then touch
See Section 3.2.4 Adjusting the Standard Curve on page 40 for more information.
Precision
Standard: 2.00 mg/L Free Cu
Program
146
See Section 3.4.3 Precision on page 44 for more information, or if the standard
concentration did not fall within the specified range.
. A summary of the standard
Standard Additions
to change these values. After values
Edit
Graph
and touch
Ideal Line
OK
Options
.
to accept the displayed concentration. If an alternate
. Touch
.
OK
Adjust
95% Confidence Limits of Distribution
1.76–2.24 mg/L Free Cu
Copper
to view the best-fit line through
to view the relationship between
on the current program menu.
Page 3 of 4
.
Read
Copper
Advertisement
Table of Contents
