EPA Method 365.4

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EPA Method 365.4:
Phosphorus by Automated Colorimetry. Official Name: Phosphorus, Total (Colorimetric, Automated, Block Digestor AA II)

Summary:
The sample is heated in the presence of sulfuric acid, potassium sulfate, and mercuric sulfate for two and one half hours. The residue is cooled and diluted to 25 mL and placed in autoanalyzer for determination of phosphorus by colorimetry.

Scope:
This method determines total phosphorus in drinking water, surface water; domestic and industrial wastes.

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

Interferences:
None provided.

QC Requirements:
None.

Maximum Holding Time:
48 hours (orthophosphate, dissolved)28 days (Hydrolyzable and Total)24 hours (Total Dissolved).(MCAWW, Table 1).

Media:
WATER

Subcategory:
Inorganic

Concentration:
0.01 to 20 mg P/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