L3 - Analytical Environmental Chemistry CHM410/1410 Fall...

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Unformatted text preview: Analytical Environmental Chemistry CHM410/1410 Fall 2011 Lecture 3 Sample preparation 2 Problems? Solid Phase Extraction (Exhaustive Extraction) Analyte either ad sorps or ab sorbs to a solid support Absorption vs Adsorption A b sorption An increase in quantity (transfer) of a material (analyte of interest) from one phase into another phase (solid support). A d sorption An increase in quantity (transfer) of a component (analyte) from one phase onto an interface (surface) Solid Phase Extraction - Water (Exhaustive Extraction) Sorbent Environment Pump Water Sorbent Water sample Vacuum manifold Solid Phase Extraction (Exhaustive Extraction) Polymer sorbent for solid phase extraction is poly(styrene divinylbenzene). Surface of silica bonded with an octadecyl (C18) alkyl chain Sorbent: Silica-based or polymer-based Solid Phase Extraction (Exhaustive Extraction) Surface of silica bonded with an octadecyl (C18) alkyl chain Underivatized silica is an amorphous and porous solid: Contains polysiloxane (Si-O-Si) and silanol (Si-OH ) groups Convalently bonded to a functional group ( e.g. Alkyl chains of varying length (C18), (C8), (C4 ) endcapping Sorbent: Silica-based Solid Phase Extraction (Exhaustive Extraction) Surface of silica bonded with an octadecyl (C18) alkyl chain Underivatized silica is an amorphous and porous solid: Contains polysiloxane (Si-O-Si) and silanol (Si-OH) groups Convalently bonded to a functional group (e.g. Alkyl chains of varying length (C18), (C8), (C4) endcapping chlorodimethylysilane Sorbent: Silica-based Solid Phase Extraction (Exhaustive Extraction) Polymer sorbent for solid phase extraction is poly(styrene divinylbenzene). Sorbent: polymer-based First polymer sorbent for SPE: a cross-linked poly(styrene divinylbenzene ) a different selectivity than C18 bonded silica by nature of the aromatic rings and the attached...
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L3 - Analytical Environmental Chemistry CHM410/1410 Fall...

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