Sample Preparation Strategies for Water Analysis

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Why Mixed-Mode? Mixed Mode? Mixed-Mode SPE extends pH range for good retention of acids or bases Retention can be by reversed-phase, ion-exchange or both — Chose retention mode by adjusting pH — ion-exchange allows for good retention in strong solvent o acids can be retained by anion-exchange while bases/neutrals are washed off with strong solvent o bases can be retained on cation-exchange while acids/neutrals are washed off with strong solvent For environmental analysis, mixed-mode SPE allows simultaneous retention of acids and bases ©2007 Waters Corporation 16
Oasis ® Family of Mixed-Mode Mixed Mode Sorbents: Reversed-Phase Reversed Phase Retention and Ion Exchange ©2007 Waters Corporation 17
Page 1 and 2: ©2007 Waters Corporation Sample Pr
Page 3 and 4: Why Sample Prep? 60% of the work ac
Page 5 and 6: Some Considerations Solid samples
Page 7 and 8: Why Solid Phase Extraction Isolati
Page 9 and 10: Outline Introduction — Why sampl
Page 11 and 12: 1. Sample is loaded onto SPE sorben
Page 13 and 14: SPE Strategy 3 Dispersion Cleanup
Page 15: Ion-Exchange Ion Exchange and Mixed
Page 19 and 20: Introduction Perfluorinated compou
Page 21 and 22: Goals Develop an Acquity UPLC TM s
Page 23 and 24: Oasis ® 2x4 Method For Acids, Base
Page 25 and 26: SPE Protocol Oasis ® WAX Optimized
Page 27 and 28: C3-C7 C3 C7 in River Water 100 ng/L
Page 29 and 30: River Water Recoveries Spike Level
Page 31 and 32: Conclusions • Oasis ® WAX SPE me
Page 33 and 34: Oasis ® 2x4 Method: Method Startin
Page 35 and 36: Oasis ® MAX SPE Method Acidic Herb
Page 37 and 38: Retention Factor (k’) % Eluted Re
Page 39 and 40: Optimized SPE Protocol Paraquat/Diq
Page 41 and 42: 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1
Page 43 and 44: Oasis ® 2x4 Method: Method Startin
Page 45 and 46: GC-NPD Conditions Agilent 5890 seri
Page 47 and 48: Oasis ® Mixed-Mode Mixed Mode Sorb
Page 49 and 50: SPE of Acids and Base/Neutrals Mixe
Page 51: SPE for Base/Neutrals and Acids Oas

Sample Preparation Strategies for Water Analysis

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