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Open-File Report 2011–1295

Percent Recoveries of Anthropogenic Organic Compounds With and Without the Addition of Ascorbic Acid to Preserve Finished-Water Samples Containing Free Chlorine, 2004–10

By Joshua F. Valder, Gregory C. Delzer, David A. Bender, and Curtis V. Price

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This report presents finished-water matrix-spike recoveries of 270 anthropogenic organic compounds with and without the addition of ascorbic acid to preserve water samples containing free chlorine. Percent recoveries were calculated using analytical results from a study conducted during 2004–10 for the National Water-Quality Assessment (NAWQA) Program of the U.S. Geological Survey (USGS). The study was intended to characterize the effect of quenching on finished-water matrix-spike recoveries and to better understand the potential oxidation and transformation of 270 anthropogenic organic compounds. The anthropogenic organic compounds studied include those on analytical schedules 1433, 2003, 2033, 2060, 2020, and 4024 of the USGS National Water Quality Laboratory. Three types of samples were collected from 34 NAWQA locations across the Nation: (1) quenched finished-water samples (not spiked), (2) quenched finished-water matrix-spike samples, and (3) nonquenched finished-water matrix-spike samples. Percent recoveries of anthropogenic organic compounds in quenched and nonquenched finished-water matrix-spike samples are presented. Comparisons of percent recoveries between quenched and nonquenched spiked samples can be used to show how quenching affects finished-water samples. A maximum of 18 surface-water and 34 groundwater quenched finished-water matrix-spike samples paired with nonquenched finished-water matrix-spike samples were analyzed. Percent recoveries for the study are presented in two ways: (1) finished-water matrix-spike samples supplied by surface-water or groundwater, and (2) by use (or source) group category for surface-water and groundwater supplies. Graphical representations of percent recoveries for the quenched and nonquenched finished-water matrix-spike samples also are presented.

First posted December 19, 2011


For additional information contact:
Director, USGS South Dakota Water Science Center
1608 Mt. View Road
Rapid City, SD 57702
(605) 394-3200
http://sd.water.usgs.gov/

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Suggested citation:

Valder, J.F., Delzer, G.C., Bender, D.A., and Price, C.V., 2011, Percent recoveries of anthropogenic organic compounds with and without the addition of ascorbic acid to preserve finished-water samples containing free chlorine, 2004–10: U.S. Geological Survey Open-File Report 2011–1295, 65 p.



Contents

Foreword

Abstract

Introduction

Study Methods

Percent Recovery of Finished-Water Matrix-Spike Samples

References

Appendix 1. Supplemental Data Tables

Appendix 2. Percent Recovery of Anthropogenic Organic Compounds in Quenched and Nonquenched Finished-Water Matrix-Spike Samples from Surface-Water Supplies Collected during Source Water-Quality Assessment Sampling, 2004–10

Appendix 3. Percent Recovery of Anthropogenic Organic Compounds in Quenched and Nonquenched Finished-Water Matrix-Spike Samples from Groundwater Supplies Collected during Source Water-Quality Assessment Sampling, 2004–10

Appendix 4. Supplemental Graphs—Percent Recoveries for Quenched and Nonquenched Finished-Water Matrix-Spike Samples by Primary Use or Source Group, from Surface-Water Supplies, 2004–10

Appendix 5. Supplemental Graphs—Percent Recoveries for Quenched and Nonquenched Finished-Water Matrix-Spike Samples by Primary Use or Source Group, from Groundwater Supplies, 2004–10


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