Aluminum
Aluminum
Page 4 of 6
Aluminum_PP_Other_ALN_Eng_Ody.fm
Figure 1 Fluoride Interference Graph
Sample Collection, Storage and Preservation
Collect samples in a clean glass or plastic containers. Preserve the sample by
adjusting the pH to 2 or less with nitric acid (Cat. No. 152-49) (about 1.5 mL per
liter). Preserved samples can be stored up to six months at room temperature.
Before analysis, adjust the pH to 3.5–4.5 with 5.0 N Sodium Hydroxide
(Cat. No. 2450-26). Correct the test result for volume additions; see Section 3.1.3
Correcting for Volume Additions on page 29.
Accuracy Check
Standard Additions Method (Sample Spike)
1. After reading test results, leave the sample cell (unspiked sample) in the
instrument. Verify the chemical form.
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. Open an Aluminum Voluette
®
Ampule Standard, 50-mg/L Al.
5. Prepare three sample spikes. Fill three mixing cylinders (Cat. No. 1896-41)
with 50 mL of sample. Use the TenSette
®
Pipet to add 0.1 mL, 0.2 mL, and
0.3 mL of standard, respectively, to each sample and mix thoroughly.
6. Analyze each sample spike as described in the procedure above, starting with
the 0.1 mL sample spike. 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.
mg/L Al
3+
(Reading from instrument)
True Aluminum Concentration
mg/L F
–
To Next Page
Loading...
