EPA Method 420.2

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EPA Method 420.2:
Phenolics by Automated Colorimetry. Official Name: Phenolics, Total Recoverable (Colorimetric, Automated 4-AAP with Distillation)

Summary:
This automated method is based on the distillation of phenols and subsequent reaction of the distillate with alkaline ferricyanide and 4-aminoantipyrine to form a red complex which is measured with an on-line colorimeter.

Scope:
This automated method determines phenolic compounds in drinking, surface and saline waters; domestic and industrial wastes.

Citation:
Methods for the Chemical Analysis of Water and Wastes (MCAWW) (EPA/600/4-79/020)

Interferences:
(A) Sulfur compounds: Interferences from sulfur compounds are eliminated by acidifying the sample to pH < 4 with phosphoric acid and aerating briefly by stirring and adding copper sulfate.(B) Oxidizing agents: Oxidizing agents can oxidize phenolics, causing results to be low. Test for the presence of oxidizing agents with potassium iodide strips. If present, remove them when sampling by adding ferrous ammonium sulfate in excess.(C) Contamination: Contamination from plastic tubing and sample containers is eliminated by using glass and Kel-F tubing.

QC Requirements:
None.

Maximum Holding Time:
24 hours.

Media:
WATER

Subcategory:
Organic

Concentration:
There are two working ranges: 2-200 ug/L and 10-500 ug/L.

Sample Prep:
None.

Precision:
Precision and accuracy values were calculated using interlaboratory data from EPA-managed Water Pollution (WP) performance evaluation studies.

Detection:
None.

Revision Number:
Issued 1974

Test Description:
Phenols - Colorimetr

Report Number:
600/4-79-020

Instrument used for this test:
FIA