Volatile Acids
Volatile Acids
VolatileAci_None_Other_ESR_Eng_Ody.fm Page 3 of 6
Sample Collection, Preservation, and Storage
Collect samples in clean plastic or glass bottles. Analyze as soon as possible after
collection. Samples can be stored for up to 24 hours by cooling to 4 °C (40 °F) or
below. Warm samples to room temperature before analysis.
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 Volatile Acid Voluette
®
Ampule Standard, 62,500-mg/L as
acetic acid.
5. Prepare three sample spikes. Fill three Mixing Cylinders (Cat. No. 1896-40)
with 25 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.
17. Wipe the prepared
sample and place it into
the cell holder.
18. Touch Read.
Results will appear in
mg/L HOAC.
10 mL
20 mL
25 mL
Read
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