USGS

Method of Analysis by the U.S. Geological Survey California District Sacramento Laboratory-- Determination of Dissolved Organic Carbon in Water by High Temperature Catalytic Oxidation, Method Validation, and Quality-Control Practices

By Susan M. Bird, Miranda S. Fram, and Kathryn L. Crepeau

 

U.S. GEOLOGICAL SURVEY

Open–File Report 03-366

Sacramento, California 2003





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Abstract

    

An analytical method has been developed for the determination of dissolved organic carbon concentration in water samples. This method includes the results of the tests used to validate the method and the quality-control practices used for dissolved organic carbon analysis. Prior to analysis, water samples are filtered to remove suspended particulate matter. A Shimadzu TOC-5000A Total Organic Carbon Analyzer in the nonpurgeable organic carbon mode is used to analyze the samples by high temperature catalytic oxidation. The analysis usually is completed within 48 hours of sample collection. The laboratory reporting level is 0.22 milligrams per liter.

CONTENTS

Abstract

Introduction

Method of Analysis of Dissolved Organic Carbon in Water (Parameter Code 00681) by High Temperature
Catalytic Oxidation (U.S. Geological Survey Method Number O-2201-04)

Scope and Application

Summary of Method

Equipment and Materials

Sample Collection, Filtration, and Storage

Standards

Carbon Analyzer Performance

Data Processing and Archiving

Difficult Samples

Method Validation

Precision

Method Detection Limit and Laboratory Reporting Level

Method Performance Evaluation

Quality-Control Practices

Blank Samples

Duplicate Samples

Calibration Verification

Standard Deviation and Coefficient of Variation

Maintenance and Corrective Actions

Summary

References Cited


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