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Dionex SolEx Polymer-Based Extraction Cartridges

Dionex SolEx SPE HRPHS Cartridges
The HRPHS stationary phase is a neutral resin comprised of a high-surface-area, divinylbenzene-based particle grafted with a polyvinylpyrrolidone polymer. This material has properties of a hydrophilic, reversed-phase substance and also has specific high capacity for polyphenols, including humic acids and azo-containing substances such as azo dyes. The hydrophilic, reversed-phase properties allow high recovery of hydrophobic targets.

Dionex SolEx SPE SAX Cartridges
The SAX stationary phase is comprised of a high-surface-area divinylbenzene resin particle grafted with aromatic quaternary ammonium functionality. This phase is recommended for the SPE of weak acid anions such as carboxylates.

Dionex SolEx SPE SCX Cartridges
The SCX stationary phase is comprised of a high-surface-area divinylbenzene resin particle grafted with aromatic sulfonic acid groups. The SCX phase has a mixed-mode, reversed-phase, cation-exchange functionality. This phase is recommended for the SPE of weak cations, such as weak base amines.

Dionex SolEx SPE WAX Cartridges
The WAX stationary phase is comprised of a medium-surface-area divinylbenzene resin particle grafted with an amine functionality. The WAX is a mixed-mode, reversed-phase, anion-exchange phase. Strong acids are retained at low pH where the amine sites on the resin are charged (and therefore capable of ion exchange) and eluted, raising the pH and therefore neutralizing the stationary phase. This is the common methodology when the target species are permanently (strongly) charged anions such as sulfonates.

Dionex SolEx SPE WCX Cartridges
The WCX stationary phase is comprised of a medium-surface-area divinylbenzene resin particle grafted with carboxylate functional groups. This phase is recommended for the SPE of strong (permanently charged) cations such as quaternary ammonium compounds. The phase is conditioned at pH 8 or higher. The phase is washed and the targets eluted by protonating the stationary phase to carboxylic acid (neutral), thus eliminating the ion-exchange retention mechanism.