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

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ENVIRONMENTAL ANALYSIS I. Solid Phase Extraction carbon-based sorbents

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

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

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

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

Recovery of B/N Pesticides ether/nC6 1:1 pEther/To 67:33 MeCl/ACN 3:2 MeCl/MeOH 4:1 MeCl Methomyl Metoxuron< Atrazine Propachlor ParathionEt

GCB vs. C18 Extraction GCBC18 1L2L4L2L Methomyl Metoxuron Atrazine Propachlor Parathion-Et Dinitro-o-Cresol ,4-D