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Verification of Multiple Phosphorus Analyzers for Use in Surface-Water Applications

Open-File Report 2022-1100
Groundwater and Streamflow Information Program
Prepared in cooperation with the Next Generation Water Observing System
By:
https://doi.org/10.3133/ofr20221100

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Abstract

The U.S. Geological Survey (USGS) completed a verification study of selected commercially available phosphorus analyzers for their applicability to scientific surface-water applications. In this study, the analyzers were the Hach EZ7800 TOPHO, Hach Phosphax sc, Sea-Bird Scientific HydroCycle-PO4, and the YSI Inc. Alyza IQ PO4. Verification tests included laboratory trials comparing analyzer results to known standards with several known concentrations of dissolved organic matter and waste production estimates. Field trials were completed at the Vermilion River near Danville, Illinois (U.S. Geological Survey station 03339000), where analyzer-measured concentrations were compared against discrete samples across a wide range of environmental conditions from November 2020 to August 2021. Data coverage was closely tracked for analyzer malfunctions and operator errors that caused missing data. Laboratory and field trials indicated that each analyzer is a viable option for scientific surface-water studies depending on environmental conditions. Because of the complexity of the analyzers, a substantial time investiture was required to get maximum data coverage including considerable site infrastructure investments and well-trained technicians. Data coverage was closely related to each analyzer’s ability to handle elevated turbidity levels.

Suggested Citation

Peake, C.S., 2022, Verification of multiple phosphorus analyzers for use in surface-water applications: U.S. Geological Survey Open-File Report 2022–1100, 23 p., https://doi.org/10.3133/ofr20221100.

ISSN: 2331-1258 (online)

Study Area

Table of Contents

  • Acknowledgments
  • Abstract
  • Introduction
  • Purpose and Scope
  • Analyzer Specifications
  • Site Description
  • Methods
  • Laboratory Verification Results
  • Field Verification Results
  • Summary
  • References Cited
  • Appendix 1. Laboratory Standard Values
Publication type Report
Publication Subtype USGS Numbered Series
Title Verification of multiple phosphorus analyzers for use in surface-water applications
Series title Open-File Report
Series number 2022-1100
DOI 10.3133/ofr20221100
Year Published 2022
Language English
Publisher U.S. Geological Survey
Publisher location Reston, VA
Contributing office(s) Central Midwest Water Science Center
Description Report: viii, 23 p.; Dataset
Country United States
State Illinois, Indiana
Other Geospatial Vermilion River Basin
Online Only (Y/N) Y
Google Analytic Metrics Metrics page
Additional publication details