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ENVIRONMENTAL ANALYSIS I. Solid Phase Extraction

ENVIRONMENTAL ANALYSIS I. Solid Phase Extraction. carbon-based sorbents. Graphitized Carbon Blacks. 120/400 mesh Non-porous Easy, Rapid Flow 100 m 2 /g Surface Area High Capacity GC Stationary Phases Sorbent Surface Contaminated w. oxygen complexes. MRM for Pesticides.

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ENVIRONMENTAL ANALYSIS I. Solid Phase Extraction

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  1. ENVIRONMENTALANALYSISI. Solid Phase Extraction carbon-based sorbents

  2. Graphitized Carbon Blacks • 120/400 mesh • Non-porous • Easy, Rapid Flow • 100 m2/g Surface Area • High Capacity • GC Stationary Phases • Sorbent Surface • Contaminated w. oxygen complexes

  3. MRM for Pesticides Pesticide classes • Carbamates • Phenylureas • Triazines • Acetanilides • Phorphorothioates • Phenols • Phenoxyacids Analytical method: HPLC

  4. Extraction of Pesticides 0.4g/L Na-sulfite 5mL MeCl/MeOH (4:1) Sample pre-treatment Column conditioning Column equilibration Sample application 2mL MeOH 15mL of 10g/L ascorbic acid in HCl-acidified water (pH 2) 150 mL/min

  5. Extraction of Pesticides (cont.) Interference elution Analyte elution 7mL water, 1 min N2 or CO2 A: base/neutrals 1 ml MeOH 6 mL MeCl/MeOH (4:1) B: acids 6 mL MeCl/MeOH (3:2) + 16mM KOH

  6. Recovery of B/N Pesticides

  7. GCB vs. C18 Extraction

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