Methods of analysis by the U.S. Geological Survey National Water Quality Laboratory-Determination of pesticides in water by graphitized carbon-based solid-phase extraction and high-performance liquid chromatography/mass spectrometry

Abstract

Introduction Analytical Method 1. Application 2. Summary of method 3. Interferences 4. Apparatus and instrumentation 5. Reagents and solutions 6. Safety precautions 7. Procedure 8. Calculations 9. Reporting of results 10. Quality assurance/quality control 11. Method performance Conclusions References cited CONTENTS III 8. Mass spectrometer operating conditions during positive and negative ionization analyses used in this method 9a. Mass spectrometer time-programmed operating conditions for individual compounds determined under positive ionization conditions 9b. Mass spectrometer time-programmed operating conditions for individual compounds determined under negative ionization conditions 10. Quantitation and confirmation ions used for the compounds determined in this method 11. Autotune parameters for acceptable tuning criteria used in this method 12. Typical minimum sample analysis sequence for high-performance liquid chromatography/mass spectrometry analysis in this method 13. Accuracy and precision data from 10 determinations of the method compounds fortified at 0.025 microgram per liter in organic-free water, under positive ionization conditions 14. Accuracy and precision data from 10 determinations of the method compounds fortified at 0.025 microgram per liter in organic-free water, under negative ionization conditions 15. Accuracy and precision data from seven determinations of the method compounds fortified at 0.10 microgram per liter in organic-free water, under positive ionization conditions 16. Accuracy and precision data from seven determinations of the method compounds fortified at 0.10 microgram per liter in organic-free water, under negative ionization conditions 17. Accuracy and precision data from nine determinations of the method compounds fortified at 0.50 microgram per liter in organic-free water, under positive ionization conditions 18. Accuracy and precision data from nine determinations of the method compounds fortified at 0.50 microgram per liter in organic-free water, under negative ionization conditions 19. Accuracy and precision data from 10 determinations of the method compounds fortified at 0.025 microgram per liter in groundwater samples, under positive ionization conditions 20. Accuracy and precision data from nine determinations of the method compounds fortified at 0.025 microgram per liter in groundwater samples, under negative ionization conditions 21. Accuracy and precision data from six determinations of the method compounds fortified at 0.10 microgram per liter in groundwater samples, under positive ionization conditions 22. Accuracy and precision data from six determinations of the method compounds fortified at 0.10 microgram per liter in groundwater samples, under negative ionization conditions 23. Accuracy and precision data from 11 determinations of the method compounds fortified at 0.50 microgram per liter in groundwater samples, under positive ionization conditions 24 Accuracy and precision data from 10 determinations of the method compounds fortified at 0.50 microgram per...

Non-Point Sources (Septic Tanks) of Surface Water Nutrient Pollution: A Review and a Study of Taylor Creek, Okeechobee County, Florida

“…At FIU-EARL multi-matrix ultra-trace analysis by SPE HPLC high-resolution mass spectrometry was performed. That procedure is based on the U.S. Geological Survey (USGS) method O-2060-01 and has a detection limit of 11 ng sucralose/L (Furlong et al, 2001cf. Batchu et al, 2015Loos et al, 2009).…”