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1 INTRODUCnON ^ ANALYTICAL METHOD FOR ARSENIC AND SELENIUM 3 1. Application 3 2. Summary of Method 3 3. Interferences 4 4. Instrumentation ^ 5. Apparatus 10 6. Reagents 10 7. Standards 11 8. Sample preparation 11 9. Instrumental performance 14 10. Calibration 14 11. Procedure and data evaluation 14 12. Calculations 15 13. Reporting of results 16 14. Bias and variability 16 DISCUSSION OF RESULTS 17 Method detection limit 17 Bias and variability data 17 Standard reference materials 17 Spike recoveries in water samples 23 Analysis of water samples 31 QUALITY ASSURANCE 37 CONCLUSIONS 37 REFERENCES CITED 38

u.s. geological survey open file report/open-file report

Methods of analysis by the U.S. Geological Survey National Water Quality Laboratory-Determination of arsenic and selenium in water and sediment by graphite furnace atomic absorption spectrometry