2. ENVIRONMENTAL ANALYSIS I. Solid Phase Extraction carbon-based sorbents

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

4. MRM for Pesticides Pesticide classes 1.Carbamates 2.Phenylureas 3.Triazines 4.Acetanilides 5.Phorphorothioates 6.Phenols 7.Phenoxyacids Analytical method: HPLC

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

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

7. Recovery of B/N Pesticides ether/nC6 1:1 pEther/To 67:33 MeCl/ACN 3:2 MeCl/MeOH 4:1 MeCl Methomyl9293919891 Metoxuron<5 139630 Atrazine419098 97 Propachlor9392949793 ParathionEt6570959291

8. GCB vs. C18 Extraction GCBC18 1L2L4L2L Methomyl9998864 Metoxuron95979864 Atrazine9697 96 Propachlor94959492 Parathion-Et989610297 Dinitro-o-Cresol 99979810 2,4-D95939641