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Title: Variability of Low Phosphorus Analytical Measurements

PROJECT NUMBER:

NUTR1R06f

PROJECT MANAGER:

Amit Pramanik (x), Ph.D., BCEEM
The Water Research Foundation

PRINCIPAL INVESTIGATOR:

Johannes B. Neethling, Ph.D., P.E., BCEE
HDR, Inc.
jb.neethling@hdrinc.com

STATUS:

Completed

LAST UPDATED:

6/17/2009

REPORT DESCRIPTION:

This study provides important information regarding the capability of wastewater treatment facilities and commercial laboratories to measure low levels of phosphorus (20 µg/L) accurately and reliably. Phosphorus measurements at very low concentrations were tested by these laboratories and shown to be unreliable. The findings suggest that sample matrix and digestion methodologies contribute to the variability. Measurements to comply with very low limits (<20 ug/L TP) will inherently vary, making it challenging to determine both the environmental impact of the discharge stream and the performance of the wastewater treatment facility. Published by WERF. 66 pages. Online PDF. (2009)

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