How can phenol samples be preserved?

Document ID

Document ID TE1773

Version

Version 3.0

Status

Status Published

Published Date

Published Date 07/24/2018
Question
How can phenol samples be preserved?
Summary
Phenol preservation
Answer
For the most reliable results, analyze samples for phenol within 4 hours of collection.  If prompt analysis is not possible, preserve the samples. Follow the preservation instructions in the analytical method. 

For Hach Method 8047 following EPA 420.1 preservation:

1. Collect 500 mL of sample in a clean glass container.
2. Add the contents of two Copper Sulfate Powder Pillows.
3. Adjust the pH to 4 or less with 10% Phosphoric Acid Solution.
4. Keep the preserved samples at or below 6C (43F) for a maximum of 24 hours.
5. Distill samples per Method 8047 instructions before analysis.

For Hach Method 10266 following Standard Methods 5530 preservation:

1. Collect 500 mL of sample in a clean glass container.
2. Adjust the pH to 2 or less with H2SO4.
3. Keep the preserved samples at or below 6C (43F) for a maximum of 28 days.
4. Distill samples per Method 10266 instructions before analysis.

Please also see:
Side-By-Side Comparison Table for Hach Method Number 10266 Colorimetric Determination of Phenol
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