An automated inline solution to remove interfering substances in your sample

Need to remove matrix interferences such as metals and cations, or hydrophobic organic substances and surfactants that interfere with your ion chromatography (IC) applications? Thermo Scientific Dionex Guardcap Vial Caps provide a smart, automated sample preparation and filtration solution for your IC analyses.

ICS-4000 Capillary HPIC System with AS-DV autosampler
ICS-4000 Capillary HPIC System with AS-DV autosampler

How Dionex Guardcap Vial Caps work

The Dionex Guardcap Vial Cap embeds resin that removes specific types of interfering substances from your matrix. The Guardcap Vial Cap is placed on top of 5mL Dionex PolyVials in the Dionex AS-DV autosampler. The Dionex AS-DV holds 50 vials that can be sampled in any order, and programmed to take multiple samples from each vial. The vial design eliminates the need for an external sampling pump. Important parameters that can affect the reproducibility of sample preparation such as timing, flow rate, and delivery volume are easily set and controlled by the autosampler.

Dionex Guardcap Vial Caps are embedded with resin and fit on Dionex PolyVials
Dionex Guardcap Vial Caps are embedded with resin and fit on Dionex PolyVials

Dionex Guardcap Vial Caps

There are three versions of Dionex Guardcap Vial Caps currently available:

Automatically remove alkaline earth and transition metals, neutralize high pH samples, and filter particulates. Dionex Guardcap H vial caps are embedded with Thermo Scientific Dionex OnGuard H resin.

Automatically remove alkaline earth and transition metals and filter particulates without changing the sample pH. Dionex Guardcap Na vial caps are embedded with Dionex OnGuard Na resin. Since sample pH remains unchanged, Dionex Guardcap Na vial caps are ideal for treating samples that contain pH-sensitive analytes (e.g., nitrite).

Automatically remove particulates and hydrophobic organic substances including non-ionic surfactants, hydrocarbons, aromatic dyes, and some carboxylic acids. Dionex Guardcap HRP vial caps are embedded with hydrophilic reversed phase resin.

Dionex Guardcap Chemistries and Example Applications

Product Functionality Capacity (meq/cap) Solvents pH Stability Example Application
Dionex Guardcap H Vial Caps Cation-exchange hydronium form 50 0-20% HPLC solvents 0-14 Removal of alkaline earth and transition metals; pH adjustment of basic samples
Dionex Guardcap Na Vial Caps Cation-exchange sodium form 50 0-20% HPLC solvents 0-14 Removal of alkaline earth and transition metals
Dionex Guardcap HRP Vial Caps Hydrophilic reversed phase 20 mg benzoic acid at pH <4 0-20% HPLC solvents 0-14 Removal of hydrophobic organics and surfactants

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