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ENVIRONMENTAL ANALYSIS I. Solid Phase Extraction

ENVIRONMENTAL ANALYSIS I. Solid Phase Extraction. sorbent configurations – stacked phases. Sorbent Configurations to Enhance Selectivity. Stacked phases Layered phases Mixed phases. Role of Stacking Phases. Extending the range Enhancing the selectivity Method development

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ENVIRONMENTAL ANALYSIS I. Solid Phase Extraction

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  1. ENVIRONMENTALANALYSISI. Solid Phase Extraction sorbent configurations – stacked phases

  2. Sorbent Configurations to Enhance Selectivity • Stacked phases • Layered phases • Mixed phases

  3. Role of Stacking Phases • Extending the range • Enhancing the selectivity • Method development • Multiple detection protocol

  4. CBA Stacked Columns Bases, Acids and Neutrals HPLC Compatible Solvent GC Compatible Solvent Bases Retained (Paraquat, Diquat) CBA Analyte ENV+ Acids and Neutrals Retained ENV+ Bases for HPLC Analysis Acids and Neutrals for GC Analysis

  5. alpha - BHC beta - BHC gamma - BHC delta - BHC heptachlor aldrin heptachlor epoxide endosulfan I 4,4" DDE dieldrin endrin 4,4" DDD endosulfan II endrin aldehyde 4,4" DDT endosulfan sulfate methoxychlor AVG: 94 90 92 99 91 73 89 90 62 89 86 91 78 95 100 88 99 88 OC Pesticides on C18(EC)

  6. OC Pesticides, Stacked Phases C18 (EC) C2 C18 (EC) SUM alpha - BHC 0 101 101 beta - BHC 0 101 101 gamma - BHC 0 100 100 delta - BHC 0 97 97 heptachlor 85 7 92 aldrin 85 0 85 heptachlor epoxide 57 47 104 endosulfan I 65 42 107 4,4" DDE 86 5 91 dieldrin 80 21 101 endrin 67 34 101 4,4" DDD 90 6 96 endosulfan II 65 37 102 endrin aldehyde 11 84 95 4,4" DDT 85 0 85 endosulfan sulfate 29 57 86 methoxychlor 112 0 112 AVG: 54 43 97 94 90 92 99 91 73 89 90 62 89 86 91 78 95 100 88 99 88 Vs

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